When you take your primary apart as suggested by Sled Dog, you need to reassemble it matching up the 'X' on both pieces. If you don't, you will have a vibration.
Sled Dog has given you great advise moving forward.
Keep us posted.
Sled Dog has given you great advise moving forward.
Keep us posted.
derek.p
Extreme
I will not run the sled until I pull off the clutch, also just noticed my donuts are done, would this cause some of the vibration to.
Soldier'spapa
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After you pull the primary run the engine. If the vibration is still felt replace the donuts and try it again (still with the primary off). If then the vibration is gone, you solved the problem.
You said you changed the track.creases from being rolled up folded new ,then installed will send out vibration till its pulled and pulled.maybe this is what your feeling?
derek.p said:
The donuts will not cause the engine to run with a vibration. The engine will sound different and louder and most likely some ratteling if your donuts are gone.
If the vibration is still there with the primary clutch removed, you will have isolated the vibration to the engine itself. It's likely running on three cylinders, Plugs / coils / injectors would be the next things to check or eliminate. You could unplug the coils or the injectors, one at a time to isolate the problem cylinder. If the vibration gets worse, that cylinder was working. But if the vibration stays the same, then that is the cylinder with the problem.
derek.p
Extreme
Ok pull off the primary and it still had the vibration, so then I pulled the yamacharger turbine that is bolted to the crank off and still it vibrated. i checked all the motor mounts and all is good, then checked spark plugs and running on all four.Now I will get the injectors cleaned and change the donuts, and keep you guys posted. Once again thanks alot your info is helping me look at things I didn't think off, much apreciated.
You may have a bent crank shaft!
derek.p
Extreme
I hope the god it's not that, this is why I bought a 4 stroke to not have these proplems like 2smokes. Wouldn't that make the sled run a little bad because the sled still halls #*$&@. I had this vibration last season too, wouldn't have blew by now. Just wondering if there would be a engine knock.
I hope not too but we are running out of things to check maybe its a bearing in gear reducer. We have to keep doing trial by error until we find it.
derek.p
Extreme
Thanks sled dog, when you mentioned the crank my heart went to throat and started sweating, thats just who I am. So where is this gear reducer.
Its what the primary clutch actually attaches too. In the parts list link at the top of each page if you click on the yamaha parts finder link it is under crankshaft piston. Can you wiggle or find any play on the stub where the primary attaches too?
turbine tester
Pro
Did you put fresh fuel in this year? If so did you put the same fuel in your other sled that is vibrating? You may have a bunch of bad fuel.
Long shot but seems kind of funny that they both vibrate this year.
Long shot but seems kind of funny that they both vibrate this year.
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