 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
|
 Posted: Mon Jun 18, 2012 1:02 pm Post subject: Re: Rotax 912 ul engine problems |
 |
|
Hi Craig,
Just like that one. What happens is the sheath is metal on the inside and some times they get a slight corrosion and or some throttle setups have a little too much bend in one cable. It only takes about 1/16" with a little friction in a long cable with too tight a bend to cause the cable to not go back exactly to the same position. If you have a cable setup with small 1mm- 1.2mm cable then the springs on the carbs will almost always pull the cables back exactly to the same place every time. With a thick cable with a little bend the springs sometimes don't have quite enough tension to pull every last little bit of cable taught. The guys with the springs on the opposite side of the throttle arm that pull the cable back to idle cab be at times even worse. This condition will show up in a carb sync. Sync the carbs and then pull them back and forth 3-4 times and they should go back to where you set them the first time. If they seem to keep getting out of adjustment and you have a Vernier cable then you know what the issue is. I use my finger on the throttle arms to make sure the Vernier type cable always comes completely back out and make sure any little friction isn't a player in the sync job.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
|
_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
|
| Back to top |
|
 |
Gtblu
Joined: 18 Jul 2006
Posts: 37
Location: Australia
|
| Posted: Mon Jun 18, 2012 2:36 pm Post subject: Re: Rotax 912 ul engine problems |
|
|
Hi Johanne, I had a vibration problem at similar revs to you (5000) but not as bad in a 912uls. Having tried everything on the engine and gearbox I focused on the prop (thanks to Roger). It turned out to be the bolt lengths on the prop were too long by a fraction of a millimeter thus torquing the bolts to the end of their thread. Different atmospheric conditions allowed the prop hub to contract and expand, making the problem intermittent. A new set of correct length bolts solved the problem, however a whole new prop was fitted which in fact showed every prop/engine combination has its own vibration band, NOW being at about 4200 revs. Thats another topic!
Cheers
Geoff Bell
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
