---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 01/10/10: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:38 AM - Need carb help please (sdemeyer) 2. 02:00 PM - Re: Need carb help please (Richard Girard) 3. 04:33 PM - Re: Need carb help please (Roger Lee) 4. 04:44 PM - Re: Need carb help please (Chris Blackmore) 5. 05:07 PM - Re: Need carb help please (sdemeyer) 6. 05:16 PM - Re: Need carb help please (sdemeyer) ________________________________ Message 1 _____________________________________ Time: 10:38:38 AM PST US Subject: RotaxEngines-List: Need carb help please From: "sdemeyer" I rebuilt the carbs on my 912UL and now have a frustrating problem I can't seem to resolve. I've been pulling my hair out on this for a couple of weeks. When I start the engine, it runs fine for a minute then starts puking fuel out the overflow, then starts running like crap. I've triple checked the float level and the float bracket is exactly parallel as the manual instructs. The kit I purchased ( from California Air ) included o-rings, gaskets, needle and main jet and I replaced everything. I'm tempted to put back the original needles and see what happens. Have any of you had this problem? How did you fix? Thanks, Scott Read this topic online here: http://forums.matronics.com/viewtopic.php?p=280914#280914 ________________________________ Message 2 _____________________________________ Time: 02:00:22 PM PST US Subject: Re: RotaxEngines-List: Need carb help please From: Richard Girard If you have a fuel boost pump drop the float bowl, turn on the pump and see if you can stop the flow of fuel by manually pushing the needle valve against the seat. While you've got it open pull the needle valve out and look it over with a magnifying glass to see it the needle tip is scarred. Rick Girard On Sun, Jan 10, 2010 at 12:35 PM, sdemeyer wrote: > scottsr1100rt@yahoo.com> > > I rebuilt the carbs on my 912UL and now have a frustrating problem I can't > seem to resolve. I've been pulling my hair out on this for a couple of > weeks. > > When I start the engine, it runs fine for a minute then starts puking fuel > out the overflow, then starts running like crap. I've triple checked the > float level and the float bracket is exactly parallel as the manual > instructs. > > The kit I purchased ( from California Air ) included o-rings, gaskets, > needle and main jet and I replaced everything. > > I'm tempted to put back the original needles and see what happens. > > Have any of you had this problem? How did you fix? > > Thanks, > > Scott > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=280914#280914 > > ________________________________ Message 3 _____________________________________ Time: 04:33:19 PM PST US Subject: RotaxEngines-List: Re: Need carb help please From: "Roger Lee" Hi Scott, After you re-installed the carbs did you mechanically and pneumatically balance them? It is an absolute have to do item. An out of balance/sync carb setup will run rough and puke fuel like crazy. Is it hard starting? You may have put the en-richer circuit in backwards if it is hard to start on top of your problems. Does the problem clear up if you go up to 4000 rpm? -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=280955#280955 ________________________________ Message 4 _____________________________________ Time: 04:44:07 PM PST US From: "Chris Blackmore" Subject: Re: RotaxEngines-List: Need carb help please Yes, replace the needle valve to prove the point after checking it .....D on t mix and match, check to see if it is aligned going to the seat and not hanging up, did the jets come out? -------Original Message------- From: Richard Girard Subject: Re: RotaxEngines-List: Need carb help please If you have a fuel boost pump drop the float bowl, turn on the pump and s ee if you can stop the flow of fuel by manually pushing the needle valve against the seat. While you've got it open pull the needle valve out and look it over with a magnifying glass to see it the needle tip is scarred. Rick Girard On Sun, Jan 10, 2010 at 12:35 PM, sdemeyer wrot e: com> I rebuilt the carbs on my 912UL and now have a frustrating problem I can' t seem to resolve. I've been pulling my hair out on this for a couple of we eks When I start the engine, it runs fine for a minute then starts puking fue l out the overflow, then starts running like crap. I've triple checked the float level and the float bracket is exactly parallel as the manual instructs. The kit I purchased ( from California Air ) included o-rings, gaskets, needle and main jet and I replaced everything. I'm tempted to put back the original needles and see what happens. Have any of you had this problem? How did you fix? Thanks, Scott Read this topic online here: http://forums.matronics.com/viewtopic.php?p=280914#280914 ========== -List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines- List ========== http://forums.matronics.com ========== le, List Admin. ="_blank">http://www.matronics.com/contribution ========== ========== ========== ========== ========== ________________________________ Message 5 _____________________________________ Time: 05:07:09 PM PST US Subject: RotaxEngines-List: Re: Need carb help please From: "sdemeyer" Well, I replaced the needles with the old set and the overflow problem stopped. Kind of weird because the new needle was exactly the same size, just had a black tip instead of a red tip the original needle had. Anyhow, I got the motor running OK and was able to do a complete mechanical sync and pneumatic sync. It still is not running very smooth at idle though and my carbtune shows a perfect balance. I'm pretty sure I still have a carb issue so I think I will just send them somewhere to be rebuilt, again. I'm too frustrated to even look at it anymore! Has anyone had experience with the Bing Pro Carb shop in KS? Scott Read this topic online here: http://forums.matronics.com/viewtopic.php?p=280961#280961 ________________________________ Message 6 _____________________________________ Time: 05:16:23 PM PST US Subject: RotaxEngines-List: Re: Need carb help please From: "sdemeyer" Roger Lee wrote: > Hi Scott, > > > After you re-installed the carbs did you mechanically and pneumatically balance them? It is an absolute have to do item. An out of balance/sync carb setup will run rough and puke fuel like crazy. Is it hard starting? You may have put the en-richer circuit in backwards if it is hard to start on top of your problems. Does the problem clear up if you go up to 4000 rpm? I did a preliminary sync because the carbs would puke before I could get started with my carbtune. The engine ran OK for the first minute and started fine. I quadruple checked the enricher circuit and it is installed correct. After I replaced the needle with original, throttle range is good except the idle ( 2000 - 1800 rpm) is rough. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=280962#280962 ------------------------------------------------------------------------------------- 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.