Join Date: Aug 2004
Location: Leamington, Ontario, Canada
Hi Larsernz, if it was my own bike I'd have the engine out and torn down on the bench for a complete inspection, but, since it belongs to someone else I don't have that luxury.
Apparently the owner of this bike has been driving it with this vibration ever since he bought the bike 3 years ago, so, it doesn't seem as though it's something that falls off immediately, especially since this fellow has put many thousands of miles on his Wing with no problems arising from this vibration.
It's only a guess on my part that it could be the alternator driveshaft bearings and the reason I guess it's that is because the rotor is mounted on the end of it and this could cause a severe vibration because of it's weight if the bearings allow it to go eccentric on its axis. I wanted to try disconnecting the stator and see if the vibration went away, but, this stator is hard wired. If your stator still has the white plug on it, disconnect the stator (3 yellow wires) and take the bike for a ride and see if the vibration subsides at all. It if does go away, then that may verify that it is the alternator driveshaft causing the problem, if not then your guess is as good as mine without looking at the inside of the engine. My next guess would possibly be clutch I think.
Please let me know if and when you get to tryyour bike with the alternator disconnected. Just make sure the stator wires do not touch ground when they are disconnected.
I sure would have liked to diagnose this problem accurately while I had the bike here, but, now I'll have to wait till it finally breaks or gets really bad to find out for sure what the real problem is. I spent 2 hours driving this bike at high speeds today and it ran fine except for that stupid, unrecognizable vibration between 1800 and 2100 RPM. If I downshifted as soon as I felt that vibration you would never know the vibration was even there. It's very strange because I can run my 84 Aspencade down to 1500 RPM in 5th gear and roll the throttle on gently and pull away without ever feeling that same vibration. It's one of those things that will probably keep me up at night until I figure out what the heck the cause of the vibration really is.
If you find anything more let me know and I'll let you know likewise.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
A place for GL1200\'s to gather.