---------------------------------------------------------- Kitfox-List Digest Archive --- Total Messages Posted Wed 07/27/11: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:23 AM - 912 model IV engine idle (PMorel) 2. 06:53 AM - Re: 912 model IV engine idle (Lowell Fitt) 3. 06:55 AM - Re: 912 model IV engine idle (Frank Goggio) 4. 07:07 AM - Re: 912 model IV engine idle (Roger Lee) 5. 07:59 AM - Re: 912 model IV engine idle (sdemeyer) 6. 08:24 PM - Rotax oil tank (BruceE7837@aol.com) ________________________________ Message 1 _____________________________________ Time: 05:23:59 AM PST US From: PMorel Subject: Kitfox-List: 912 model IV engine idle Has anyone else experienced this problem. I'm unable to sustain an engine idle below 2200 rpm without the carburetors overloading and flooding out. I suspect the angle of the engine due to the tailwheel configuration and the float level of the fuel in the carburetor bowl. My carbs are in sync with each other and would like to get the idle down. Also, what would be an ideal idle speed for a 912? Paul Morel 912 Speedster Locust Grove, GA ________________________________ Message 2 _____________________________________ Time: 06:53:38 AM PST US From: "Lowell Fitt" Subject: Re: Kitfox-List: 912 model IV engine idle Paul, I had an issue once that your post reminds me of. I rebuilt the carburetors and after every flight as I was taxiing back at idle, the engine would begin to run very rough and then would spill fuel out of the vent lines. I traced it to the new float needles. Apparently at low engine speed, there was enough vibration, that the float needles wouldn't seat securely, allowing fuel to pass and then overloading the float bowl. I went back to the original needles and no further problems. This experience tells me that you may have a bad float or a warn needle. Lowell From: PMorel Sent: Wednesday, July 27, 2011 5:20 AM Subject: Kitfox-List: 912 model IV engine idle Has anyone else experienced this problem. I'm unable to sustain an engine idle below 2200 rpm without the carburetors overloading and flooding out. I suspect the angle of the engine due to the tailwheel configuration and the float level of the fuel in the carburetor bowl. My carbs are in sync with each other and would like to get the idle down. Also, what would be an ideal idle speed for a 912? Paul Morel 912 Speedster Locust Grove, GA ________________________________ Message 3 _____________________________________ Time: 06:55:47 AM PST US From: Frank Goggio Subject: Re: Kitfox-List: 912 model IV engine idle paul i had this same problem,i changed carbs, did no good, i synced the car bs no good,i talked to the machinac working on the engine about checking th e redive system,was told that could not be the problem i could not get the engine to idle less the 2000 to 2200,talked him into taking the redive off, rebuillding it, that solved the problem=0Athe way we checked it was take th e prop off the engine, cranked it up,could idle it as low as you want, smoo th as silk,prop back on same story,just be care to go to low idle when cran king with no prop.i now idle at 1600 tom 1800 prm smooth.--- =0Afrank Goggio--- wilmington-- nc- 912 speedster=0A=0AFrom: PMorel =0ATo: kitfox-list@matronics.com=0ASent: Wednesday, July 27, 2011 8:20 AM=0ASubject: Kitfox-List: 912 model IV engine idle=0A=0A=0A Has anyone else experienced this problem. -I'm unable to sustain an engin e idle below 2200 rpm without the carburetors overloading and flooding out. -I suspect the angle of the engine due to the tailwheel configuration an d the float level of the fuel in the carburetor bowl. -My carbs are in sy nc with each other and would like to get the idle down. -Also, what would be an ideal idle speed for a 912?=0A-Paul Morel=0A912 Speedster=0A=0ALoc ================== ________________________________ Message 4 _____________________________________ Time: 07:07:50 AM PST US Subject: Kitfox-List: Re: 912 model IV engine idle From: "Roger Lee" Hi Paul, I wouldn't be too fast to blame the carb angle. There are many tail dragger's out there with 912's and no issues. Do you have fuel coming out of the vent tubes and is your engine running real rough? How old is the engine and how many hours? If it is older than 5 years have the carbs been rebuilt? What is the mag drop at let's say 3400 rpm? It should be 50-60 rpm. It may be the carb needle jet, check the mixture screw on the bottom of each carb to be turned out 1.5 turns. Make sure each choke is fully closing. What rpm did you balance the carbs at? If it was 2500 or below that was too low and your far better off doing a balance at 3500+ rpm and then making sure they are balanced at idle. If you balance at 2500 rpm then I guarantee they will be off up at 3500-4000 rpm. We don't fly next to idle rpm so the carbs shouldn't be banced there. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=347837#347837 ________________________________ Message 5 _____________________________________ Time: 07:59:23 AM PST US Subject: Kitfox-List: Re: 912 model IV engine idle From: "sdemeyer" + 1 on the float needles Lowell mentioned. I had the exact same problem and the only way I could fix was to reuse the old needles. It was very odd as the only difference I could tell was the tip material. I even sent my carbs to an authorized Rotax dealer and had them checked out to see if I screwed something up. Checked out fine but still had the same problem until I put the old needles back in. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=347842#347842 ________________________________ Message 6 _____________________________________ Time: 08:24:02 PM PST US From: BruceE7837@aol.com Subject: Kitfox-List: Rotax oil tank I want to buy one of the earlier, shorter,oil tanks for the Rotax 912S. Please contact me if you have one available. thanks,Bruce (650)504-4464 PDT ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kitfox-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kitfox-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/kitfox-list Browse Digests http://www.matronics.com/digest/kitfox-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.