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nevada drive sharft rattle

caznpete66

caznpete66

Just got it firing!
Joined
Jul 18, 2010
Messages
18
Can anybody give me an idea as t o why now that after my nevada has come back from getting the barrels sealed ,there is now a rattle/vibration that seems to come from the drive sharft/gearbox region of the bike.It only seems to rattle when you rev the engine at around 2000rpm ,and if you put you hand on the rear drive housing you can feel it vibrate from what seems the sharft housing to the gearbox,it is a 2008 model ,seems t o me ive spent so much to get it running right ,but nothing is working ,please help b4 i burn it ,yours Peter
 
caznpete66 said:
Can anybody give me an idea as t o why now that after my nevada has come back from getting the barrels sealed ,there is now a rattle/vibration that seems to come from the drive sharft/gearbox region of the bike.It only seems to rattle when you rev the engine at around 2000rpm ,and if you put you hand on the rear drive housing you can feel it vibrate from what seems the sharft housing to the gearbox,it is a 2008 model ,seems t o me ive spent so much to get it running right ,but nothing is working ,please help b4 i burn it ,yours Peter
Click to expand...

2000 RPM is pretty low. Does it only do it in neutral or under load? It won't be happy under load at only 2000 RPM.
 
nola as i stated its only when bike is at idel ,have been told it could be because the throttle bodies need sychoring again ?
 
caznpete66 said:
nola as i stated its only when bike is at idel ,have been told it could be because the throttle bodies need sychoring again ?
Click to expand...

Since the throttle bodies would have been removed and replaced in the process of resealing the barrels, it's a good bet that they are now out of balance. I'm planning this task myself over the next few weeks because I have similar symptoms, but hopefully if your bike is still under warranty you can persuade the dealership to do it. In fact even if it's not, the dealership should have balanced the throttle bodies when they refitted them as part of the job.
 
Don't forget the easy things too; sometimes a piece hitting the exhaust will masquerade as clutch/tranny noise. The two parts may rub, and resonate at 2k rpm, so that's where the noise appears.

Check your exhaust system for anything that may be hitting it. My memory may be off, but I think a sidestand bolt is a common culprit for smallblocks.

Joe
 
My breva makes noises too at idle. They differ when on the side stand, center stand, or with me holding the bike up. If there is an air leak you can get a big vibration. Since the TB's were off recently I'd check all three of the clamps on the throttle body air intakes to make sure they are tight and that the hoses are seated correctly. Also it could be a balance problem. Neither should be too hard, or expensive to resolve.
Here is a link on how to balance the TB's on a smallblock guzzi.
http://www.thisoldtractor.com/guzzi_tra ... deo/d3.mov

Good luck.
 
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