---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 03/29/09: 19 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:03 AM - Re: Engine failure on take-off. (Thilo Kind) 2. 04:42 AM - Re: Engine failure on take-off. (Karoliina Salminen) 3. 04:43 AM - Re: Engine failure on take-off. (Thom Riddle) 4. 04:51 AM - Re: Engine failure on take-off. (Dave Austin) 5. 05:39 AM - Re: Engine failure on take-off. () 6. 06:24 AM - Re: Engine failure on take-off. (Roger Lee) 7. 06:56 AM - Re: Engine failure on take-off. (Noel Loveys) 8. 07:35 AM - Re: Engine failure on take-off. (lucien) 9. 07:41 AM - Re: Engine failure on take-off. (Tom Jones) 10. 08:22 AM - Re: Engine failure on take-off. (rampil) 11. 09:17 AM - Re: Engine failure on take-off. (Jim Feldmann) 12. 11:23 AM - Re: Re: Engine failure on take-off. (george may) 13. 02:03 PM - Re: Re: Bing Carbs (Silvano Gai) 14. 03:58 PM - Re: Engine failure on take-off. (carl) 15. 05:29 PM - Re: Re: Bing Carbs (Hugh) 16. 06:19 PM - Re: Re: Bing Carbs (Silvano Gai) 17. 07:16 PM - Re: Bing Carbs (Roger Lee) 18. 07:17 PM - Re: Engine failure on take-off. (Roger Lee) 19. 08:29 PM - Re: Re: Bing Carbs (Silvano Gai) ________________________________ Message 1 _____________________________________ Time: 03:03:33 AM PST US From: "Thilo Kind" Subject: RE: RotaxEngines-List: Engine failure on take-off. Hi Jim, I had a similar experience a while ago, although the RPM only dropped to 4,000 or so and engine was running very rough. Turned out, that the choke was not completely closed (the spring didn't pull the choke all the way to close). Thilo -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Jim Feldmann Sent: Sunday, March 29, 2009 04:41 Subject: RotaxEngines-List: Engine failure on take-off. I had an engine failure on takeoff today. Fortunately it was a long runway and it happened at 10 feet altitude. No injuries, no damage, and no idea why it happened. Actually, the engine (Rotax 912 ULS) did not stop. It was running smoothly during taxi and warm up. Mag check was fine. I held short for 5 minutes or so for incoming traffic, running the engine from 2500 to 4000 for short periods. No problems. On takeoff, the engine pulled cleanly to 5000+ for the 5 or 6 seconds it took to break ground, then suddenly started running very rough and dropped to 2500 rpm or so. I immediately pulled the throttle to idle and landed. While taxiing back to the hanger it ran fine, I tried full throttle again a couple of times and it ran perfectly. So what I have is an intermittent or one time problem that could be deadly. I don't think it was ignition related, because if it was a failure of one "mag" it would have run much better than it did, and if both failed, it wouldn't have run at all. That leaves fuel or mechanical. The carbs have recently been rebuilt. After I calmed down, I checked the float bowls, they are clean, the gascolator is clean and the fuel pump is putting out 4.5 psi., right on spec. Fuel is flowing freely through all of the inline filters and the header tank is full. I did recently drain all of the fuel out of the airplane to fix a leak in the header tank. Then I simply refilled the tanks from the top. Could there have been air in the fuel line between the header tank and the gascolater? The engine had been run for half an hour or so since then, but mostly at low throttle. I have checked the throttle linkages also. No problem there. The plugs look good too, but my runups on taxi back would have obscured the evidence anyway. My A&E suggested that it could be sticky valve. Has anyone experienced a similar problem? Any thoughts on what to look for? I'm very hesitant to fly it again until I know what caused the problem -------- Jim Feldmann, 3rd owner 1994 Kitfox IV Speedster / 912 Working on my Sport Pilot Certificate Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236598#236598 Checked by AVG - www.avg.com 07:16:00 ________________________________ Message 2 _____________________________________ Time: 04:42:19 AM PST US Subject: Re: RotaxEngines-List: Engine failure on take-off. From: Karoliina Salminen Hi, > Actually, the engine (Rotax 912 ULS) did not stop. It was running smoothly during taxi and warm up. Mag check was fine. I held short for 5 minutes or so for incoming traffic, running the engine from 2500 to 4000 for short periods. No problems. On takeoff, the engine pulled cleanly to 5000+ for the 5 or 6 seconds it took to break ground, then suddenly started running very rough and dropped to 2500 rpm or so. I immediately pulled the throttle to idle and landed. I know of one case of Rotax running rough at one point and it was noticed that it does not quit unless you get the carburetors flooded because of vibration. Good idea is to reduce power (not apply full power because it could aggravate carburetor flooding) and land as soon as possible. There were three causes in this case: - one spark plug cable was faulty and sometimes disconnecting - fuel lines had been replaced and some pieces of the rubber pipes had contaminated the fuel lines by mistake, very tiny pieces were enough to cause problems and even if the tubes had been inspected for dirt, some pieces still got in the system - choke cable was jamming and was not completely closed (caused vibration and significant reduction of power) The choke cable caused general roughness and lack of power while the spark plug cable problem finally identified itself in magneto test. It was very hard to reproduce the problem on the ground. Mechanically the engine was in fact in excellent condition. Maybe you should check these things first before suspecting a mechanical problem. I have never heard of anybody having a mechanical (valve/cylinder) problem in a Rotax 912 and the engines have constantly reached their TBO hours in our flying clubs without a single mechanical failure that I would have heard of. In your case, the rpm dropping to 2500 sounds like it the carburetors were already flooding. It is not the issue itself, but the consequence of it. If full power is continued when the carbs are flooding, the engine will quit. Best Regards, Karoliina ________________________________ Message 3 _____________________________________ Time: 04:43:35 AM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "Thom Riddle" jim, I do not believe a single sticky valve would cause a 50% drop in rpm at full throttle. You don't mention how large is your header tank. If it is small enough for it to be nearly exhausted during your long wait for traffic with periodic throttle advancements to 4000 rpm then your fuel flow to the header could have been interrupted and the header emptied. Assuming your tanks are above the header tank I would run a gravity only fuel flow test from each tank to header tank in normal take-off attitude (tail down). Each tank should flow a minimum of 150% of full throttle fuel requirement by gravity alone. If this does not reveal a problem then I would suggest you tie down the airplane securely for extended static run-up and see if you can repeat this. If you can not repeat this I would dismantle and inspect each segment of the fuel system one at a time checking for anything that could cause a one time or intermittent blockage. This is a good bit of work but should take a lot less time than recovery in the hospital and rebuilding your airplane. The timing of the power loss could have been a lot worse and could be next time it happens if you don't find the cause. -------- Thom Riddle Buffalo, NY http://riddletr.googlepages.com/sportpilot-cfi http://riddletr.googlepages.com/a%26pmechanix A complex system that works is invariably found to have evolved from a simple system that works. - John Gaule Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236621#236621 ________________________________ Message 4 _____________________________________ Time: 04:51:49 AM PST US From: "Dave Austin" Subject: Re: RotaxEngines-List: Engine failure on take-off. Have you checked the tank venting? Dave Austin 601HDS - 912 ________________________________ Message 5 _____________________________________ Time: 05:39:57 AM PST US From: Subject: Re: RotaxEngines-List: Engine failure on take-off. Hi Jim, glad all went well. I'm not a mechanic but my initial thoughts were that the engine ran fine during start up, taxi, run up, and faltered when it was looking for a full volume of gas. Very likely something restricted the flow when a large amount of fuel was needed. You could have carb bowls full during low rpm, normal pressures, and still not have full flow at full rpm. I would check for debris, main tank filter, off-on valve, pinched or crimped lines, etc., something that may have restricted the flow? Fly Safe Bob Griffin ________________________________ Message 6 _____________________________________ Time: 06:24:16 AM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "Roger Lee" Hi Jim, I'm with Thom on this. It is most likely a fuel issue and especially since you just worked on the fuel system. Do as Thom suggest and check the fuel system, do a flow test and tie it down and do an extended max rpm run test. Something may be floating in the system and doesn't go to a small clog point until you demand high fuel flow then it trys to flow down stream and gets hung up. At some point you may have to pull the carbs, but do the other inspections and test first. When draining fuel use a white strainer of some sort or some container that is very clean to look for debris in the fuel. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236630#236630 ________________________________ Message 7 _____________________________________ Time: 06:56:46 AM PST US From: "Noel Loveys" Subject: RE: RotaxEngines-List: Engine failure on take-off. This is just a rough guess... emphasis on the word rough. Your engine picked up something, probably water when the throttle was opened and the fuel flow through the carbs was faster. I'd suspect condensation in the carb bowls. At lower throttle settings the water wasn't being picked up but once you oened the throttle... I'd try tying the tail down and doing a couple of full throttle runs of maybe 30 sec to a minute each. Do you have a gascolator? Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Jim Feldmann Sent: Sunday, March 29, 2009 12:11 AM Subject: RotaxEngines-List: Engine failure on take-off. I had an engine failure on takeoff today. Fortunately it was a long runway and it happened at 10 feet altitude. No injuries, no damage, and no idea why it happened. Actually, the engine (Rotax 912 ULS) did not stop. It was running smoothly during taxi and warm up. Mag check was fine. I held short for 5 minutes or so for incoming traffic, running the engine from 2500 to 4000 for short periods. No problems. On takeoff, the engine pulled cleanly to 5000+ for the 5 or 6 seconds it took to break ground, then suddenly started running very rough and dropped to 2500 rpm or so. I immediately pulled the throttle to idle and landed. While taxiing back to the hanger it ran fine, I tried full throttle again a couple of times and it ran perfectly. So what I have is an intermittent or one time problem that could be deadly. I don't think it was ignition related, because if it was a failure of one "mag" it would have run much better than it did, and if both failed, it wouldn't have run at all. That leaves fuel or mechanical. The carbs have recently been rebuilt. After I calmed down, I checked the float bowls, they are clean, the gascolator is clean and the fuel pump is putting out 4.5 psi., right on spec. Fuel is flowing freely through all of the inline filters and the header tank is full. I did recently drain all of the fuel out of the airplane to fix a leak in the header tank. Then I simply refilled the tanks from the top. Could there have been air in the fuel line between the header tank and the gascolater? The engine had been run for half an hour or so since then, but mostly at low throttle. I have checked the throttle linkages also. No problem there. The plugs look good too, but my runups on taxi back would have obscured the evidence anyway. My A&E suggested that it could be sticky valve. Has anyone experienced a similar problem? Any thoughts on what to look for? I'm very hesitant to fly it again until I know what caused the problem -------- Jim Feldmann, 3rd owner 1994 Kitfox IV Speedster / 912 Working on my Sport Pilot Certificate Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236598#236598 ________________________________ Message 8 _____________________________________ Time: 07:35:38 AM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "lucien" Roger Lee wrote: > Hi Jim, > > I'm with Thom on this. It is most likely a fuel issue and especially since you just worked on the fuel system. I had a similar experience with my 912uls right after I'd done a fuel line/filter change. The motor ran fine during warmup and during the mag check, but on the takeoff run as I approached full throttle basically one side of the engine shut down. Shook the entire plane and of course I got right off it. Turned out to be some debris having gotten into one of the carbs. A small piece of rubber or something came out when I pulled the main jet and sucked through it. If you do anything with the fuel system you have to exercise absolutely operating room cleanliness and diligence. I.e. when you change the lines, make sure you debur and cleanup any sharp edges on any "T"'s or other fittings you may use. These edges can slice into the line and send the little bits downstream into the carbs. What I do when I make the new fuel line assemblies is I flush them very thoroughly with clean gas and then cap the ends with (clean) rubber stoppers from the autoparts place. This way there's no possibility of any junk getting in the lines as I thread them through to their final positions. Only after that do I uncap and then push them onto the fittings at the fuel pump and carbs. I also cap those fittings while I'm off making the fuel line assemblies. There's no amount of attention to cleanliness and anality that's sufficient when working with the fuel system and lines. My case where my engine got crap in the carburettor was inattention to this detail when I redid the lines. I was lucky in that it happened on the ground and not in the air.... LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236644#236644 ________________________________ Message 9 _____________________________________ Time: 07:41:22 AM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "Tom Jones" > When draining fuel use a white strainer of some sort or some container that is very clean to look for debris in the fuel. Paint strainers, easy to find and inexpensive. -------- Tom Jones Classic IV 503 Rotax, 72 inch Two blade Warp Ellensburg, WA Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236647#236647 ________________________________ Message 10 ____________________________________ Time: 08:22:28 AM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "rampil" At the beginning of my flight testing I had a very similar event which repeated several times. Look for soot around your float bowls. It turned out that at high throttle, my #3 exhaust to muffler pipe would jiggle loose and shoot a jet of hot gas at my carb bowl, boiling the fuel and stopping one side of the engine! Do you have carb heat shields? -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236659#236659 ________________________________ Message 11 ____________________________________ Time: 09:17:16 AM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "Jim Feldmann" Thank you all for your replies and suggestions. I will definitely follow up on all of them. I am particularly intrigued by Rampil's response, because I just noticed a smudge above the right EGT probe, which is below the right carb. That will be the first thing I take care of. If anyone has any other thoughts, please add them to the list. -------- Jim Feldmann, 3rd owner 1994 Kitfox IV Speedster / 912 Working on my Sport Pilot Certificate Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236666#236666 ________________________________ Message 12 ____________________________________ Time: 11:23:31 AM PST US From: george may Subject: RE: RotaxEngines-List: Re: Engine failure on take-off. Jim-- Had a similar issue and it turned out to be debris=2C however=2C it was n ot obvious on warm up=2C taki or extended full throttle attemps. It finally was found when we tied the plane down in a climb attitude-about 15 degree slope. We found a grassy slope on the airfield =2C tied it down and cranked full power. It still took a couple of minute=2C but eventually the engine began to loose power. One carb had run dry due to debris in the fuel line t hat would float back and forth=2C but clog things up at attitude and fulll power. Good luck George > Subject: RotaxEngines-List: Re: Engine failure on take-off. > From: feldesign@earthlink.net > Date: Sun=2C 29 Mar 2009 09:15:58 -0700 > To: rotaxengines-list@matronics.com > ink.net> > > Thank you all for your replies and suggestions. I will definitely follow up on all of them. > > I am particularly intrigued by Rampil's response=2C because I just notice d a smudge above the right EGT probe=2C which is below the right carb. Tha t will be the first thing I take care of. > > If anyone has any other thoughts=2C please add them to the list. > > -------- > Jim Feldmann=2C 3rd owner > 1994 Kitfox IV Speedster / 912 > Working on my Sport Pilot Certificate > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=236666#236666 > > > > > > > =========== =========== =========== =========== > > > _________________________________________________________________ Quick access to Windows Live and your favorite MSN content with Internet Ex plorer 8. http://ie8.msn.com/microsoft/internet-explorer-8/en-us/ie8.aspx?ocid=B037 MSN55C0701A ________________________________ Message 13 ____________________________________ Time: 02:03:32 PM PST US From: Silvano Gai Subject: Re: RotaxEngines-List: Re: Bing Carbs I followed the advice of Roger and others and I rebuilt my carbs: what a difference, the engine runs much smoother! Ordered manual from Bing and Kit from CPS. Followed the instructions plus a couple of advices from a mechanic: - rebuild one at a time; - make a diagram of the small side card for the choke. If it is time, I recommend it -- Silvano Roger Lee wrote: > > Recommended rebuild is at 200 hrs. The kit is about $214. Parts wear whether you notice it or not. It is not hard, but you should talk to someone with experience first if you have never done it. There are a couple of things unique to the Bing. Doing it right the first time, not doing something wrong can save you a lot of heart ache and having to redo it again. They absolutely will need to have a mechanical and pneumatic balance when they are re-installed. The right way is cheaper, easier and takes less time in the long run. Trust me I have seen and rebuilt the "wrong way' ones enough. > The people who never do a rebuild don't do themselves any favors in the long run. > If you absolutely won't do it at 200 hrs. then at 300 or 400 hrs. The parts do wear! > > If you just don't want to do it yourself then I'll do them for $50 plus the rebuild kit. One day turn around. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Service Center > 520-574-1080 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=225235#225235 > > > ________________________________ Message 14 ____________________________________ Time: 03:58:56 PM PST US From: "carl" Subject: Re: RotaxEngines-List: Engine failure on take-off. Hi Jim, Lots of good advice from the list. Let me add the possibility of vapour lock after the long ground run. Also recommend you add a fuel press gauge and warning light. They help to diagnose problems as well as ident them before they lead to and engine failure. Carl ----- Original Message ----- From: "Jim Feldmann" Sent: Saturday, March 28, 2009 10:41 PM Subject: RotaxEngines-List: Engine failure on take-off. > > > I had an engine failure on takeoff today. Fortunately it was a long runway > and it happened at 10 feet altitude. No injuries, no damage, and no idea > why it happened. > > Actually, the engine (Rotax 912 ULS) did not stop. It was running smoothly > during taxi and warm up. Mag check was fine. I held short for 5 minutes or > so for incoming traffic, running the engine from 2500 to 4000 for short > periods. No problems. On takeoff, the engine pulled cleanly to 5000+ for > the 5 or 6 seconds it took to break ground, then suddenly started running > very rough and dropped to 2500 rpm or so. I immediately pulled the > throttle to idle and landed. ________________________________ Message 15 ____________________________________ Time: 05:29:07 PM PST US From: "Hugh" Subject: RE: RotaxEngines-List: Re: Bing Carbs Silvano: What do you mean, "make a diagram of the small side card for the choke? Hugh McKay -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Silvano Gai Sent: Sunday, March 29, 2009 5:03 PM Subject: Re: RotaxEngines-List: Re: Bing Carbs I followed the advice of Roger and others and I rebuilt my carbs: what a difference, the engine runs much smoother! Ordered manual from Bing and Kit from CPS. Followed the instructions plus a couple of advices from a mechanic: - rebuild one at a time; - make a diagram of the small side card for the choke. If it is time, I recommend it -- Silvano Roger Lee wrote: > > Recommended rebuild is at 200 hrs. The kit is about $214. Parts wear whether you notice it or not. It is not hard, but you should talk to someone with experience first if you have never done it. There are a couple of things unique to the Bing. Doing it right the first time, not doing something wrong can save you a lot of heart ache and having to redo it again. They absolutely will need to have a mechanical and pneumatic balance when they are re-installed. The right way is cheaper, easier and takes less time in the long run. Trust me I have seen and rebuilt the "wrong way' ones enough. > The people who never do a rebuild don't do themselves any favors in the long run. > If you absolutely won't do it at 200 hrs. then at 300 or 400 hrs. The parts do wear! > > If you just don't want to do it yourself then I'll do them for $50 plus the rebuild kit. One day turn around. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Service Center > 520-574-1080 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=225235#225235 > > > Checked by AVG - www.avg.com 07:16:00 ________________________________ Message 16 ____________________________________ Time: 06:19:04 PM PST US From: Silvano Gai Subject: Re: RotaxEngines-List: Re: Bing Carbs If you take apart the choke carb for cleaning and replacing the O-ring it is possible to reassemble the parts in two different ways and only one is correct. The exploded part list is borderline to understand how to reassemble the choke carb. Moreover the part list is only applicable to one of the two carbs, since the choke carb is not assembled in the same place for the left and right carb. A little drawing of the handle and the holes simplify reassembling. -- Silvano Hugh wrote: > > Silvano: > > What do you mean, "make a diagram of the small side card for the choke? > > Hugh McKay > > -----Original Message----- > From: owner-rotaxengines-list-server@matronics.com > [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Silvano > Gai > Sent: Sunday, March 29, 2009 5:03 PM > To: rotaxengines-list@matronics.com > Subject: Re: RotaxEngines-List: Re: Bing Carbs > > > > I followed the advice of Roger and others and I rebuilt my carbs: what a > difference, the engine runs much smoother! > > Ordered manual from Bing and Kit from CPS. > Followed the instructions plus a couple of advices from a mechanic: > - rebuild one at a time; > - make a diagram of the small side card for the choke. > > If it is time, I recommend it > > -- Silvano > > > Roger Lee wrote: > >> >> Recommended rebuild is at 200 hrs. The kit is about $214. Parts wear >> > whether you notice it or not. It is not hard, but you should talk to someone > with experience first if you have never done it. There are a couple of > things unique to the Bing. Doing it right the first time, not doing > something wrong can save you a lot of heart ache and having to redo it > again. They absolutely will need to have a mechanical and pneumatic balance > when they are re-installed. The right way is cheaper, easier and takes less > time in the long run. Trust me I have seen and rebuilt the "wrong way' ones > enough. > >> The people who never do a rebuild don't do themselves any favors in the >> > long run. > >> If you absolutely won't do it at 200 hrs. then at 300 or 400 hrs. The >> > parts do wear! > >> If you just don't want to do it yourself then I'll do them for $50 plus >> > the rebuild kit. One day turn around. > >> -------- >> Roger Lee >> Tucson, Az. >> Light Sport Repairman - Maintenance Rated >> Rotax Service Center >> 520-574-1080 >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=225235#225235 >> >> >> >> >> >> >> >> >> >> >> >> >> > > > Checked by AVG - www.avg.com > 07:16:00 > > > ________________________________ Message 17 ____________________________________ Time: 07:16:58 PM PST US Subject: RotaxEngines-List: Re: Bing Carbs From: "Roger Lee" Hi Silvano, Glad everything worked out ok for you. Was the carb balance any hassle for you? I know what you mean about the chokes/enricher circuits. Some people have turned them around, but when you would go to start it and use the choke you would know something was up, you just might not know you had the enricher circuit turned around. Bing, Rotax and several Mfg's recommend that carbs be rebuilt every 200 hrs. I agree in theory, but depending on the plane and pilot use some could go longer. Some guys go 800+ hrs and never rebuild. They just don't realize that these carbs are moving constantly inside and parts are rubbing together and "O" rings wear. The parts get out of tolerance and change the way things run, but they never really see it because it is a slow process. Some pilots think so long as it stays in the air everything is good. A plane is not the toy to be a high miler cheapskate like you hear about some auto drivers. If you can't turn lose of a few dollars for your own safety and that of your passenger you should probably own a go-cart and stay on the ground. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236770#236770 ________________________________ Message 18 ____________________________________ Time: 07:17:35 PM PST US Subject: RotaxEngines-List: Re: Engine failure on take-off. From: "Roger Lee" Hi Guys, While talking about vapor lock I would recommend that all have a recirculation line in the fuel system if you don't as this will help reduce a chance of vapor lock. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=236772#236772 ________________________________ Message 19 ____________________________________ Time: 08:29:14 PM PST US From: Silvano Gai Subject: Re: RotaxEngines-List: Re: Bing Carbs Carb balance took a while, it required some patience, but at the end I had a good balance in all the range -- Silvano Roger Lee wrote: > > Hi Silvano, > > Glad everything worked out ok for you. Was the carb balance any hassle for you? > I know what you mean about the chokes/enricher circuits. Some people have turned them around, but when you would go to start it and use the choke you would know something was up, you just might not know you had the enricher circuit turned around. > Bing, Rotax and several Mfg's recommend that carbs be rebuilt every 200 hrs. I agree in theory, but depending on the plane and pilot use some could go longer. Some guys go 800+ hrs and never rebuild. They just don't realize that these carbs are moving constantly inside and parts are rubbing together and "O" rings wear. The parts get out of tolerance and change the way things run, but they never really see it because it is a slow process. Some pilots think so long as it stays in the air everything is good. A plane is not the toy to be a high miler cheapskate like you hear about some auto drivers. If you can't turn lose of a few dollars for your own safety and that of your passenger you should probably own a go-cart and stay on the ground. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Service Center > 520-574-1080 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=236770#236770 > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.