Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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 Posted: Fri Jun 08, 2007 8:40 am Post subject: Carb Balance / Sync |
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Hi all,
Had a nice gentleman come over form Silver City to get a carb sync. He had about 200hrs. on his 912uls. He said he thought it was running ok. Bottom line is his carbs were not only out of mechanical sync because of uneven cable set, but the pneumatic sync was out 4" of vacumm.
Moral of this story: it doesn't have to feel or sound bad.
carbs do get out of sync and if you have never synced them, then they are out of sync. period. This makes one side work against the other at different rpms. There is no arguement here it's just a fact.
A manual sync is not a fix or a replacement and they need to be pneumatically synced, the engine needs both. Everyone I know that does their sync evey 100 hrs. always finds the sync out some. Some more than others.
This is so easy to do I have a hard time figuring out why some are so resistant to do this required function.
I have yet to hook up a set of gages and find the carbs in perfect sync after some amount of run time on any 912.
The carb system is a linked system with different components and any one of those can and do change from time to time.
I would be happy to talk anyone through this if they would like to learn.
Roger Lee Tucson,Az 520-574-1080
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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