Today's Message Index:
----------------------
1. 12:50 PM - Rough Running 912 (Goodone)
2. 01:40 PM - Re: Rough Running 912 (Roger Lee)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Rough Running 912 |
I have an 80 HP Rotax 912 UL that I like a lot. Lately I have noticed that there
is a slight roughness in the engine if I cruise between about 4200 and 4600
rpm. I have not synchronized the carbs for over 2 years now because the engine
seems to run fine at idle speeds less than 1800 rpm and I have been told that
any unbalance between the carbs shows up at idle. I dont believe that there is
any problem with the plugs. Any suggestions or constructive comments as to what
the problem might be or as to how to trouble-shoot would be appreciated.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=217651#217651
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rough Running 912 |
Hi Goodone,
You absolutely do have an unbalanced carbs. That's only because they haven't been
balanced in so long. It should be done every 100 hr. or at least at the condition
inspection each year if you have low time. Don't let anyone try to convince
you otherwise and if someone has been to a Rotax school they absolutely wouldn't
make a comment like that.
The rough running can absolutely be unbalanced carbs. One side of the engine is
trying to run let's say at 4400 rpm and the other at 4500 rpm or worse. Think
about what two opposing sides running at different rpm is doing to your engine
and gear box over time. One of the most important things to do on your Rotax
is to keep the carbs synced. It needs a mechanical and pneumatic sync. It is
not hard and should be done asap. Whom ever told you an unbalanced carb sync only
shows up at idle doesn't know what they are talking about. No matter what,
the carbs will get out of balance over time. They will get out of balance for
several reasons. (i.e. cable stretch, worn interior parts, leaks,ect...)
How many hours total on these carbs? They may even need a rebuild.
It's your hide and pocketbook at stake, so taking 30-60 min. to do a carb sync
is cheap insurance.
If you need help please don't hesitate to call me. 520-574-1080
--------
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=217659#217659
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|