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Re: Lurching Bucking
Posted by Unknown Sender (more from Unknown Sender) on Wed, 16 Apr 2003 00:14:30
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

When I first got my (used) '91 900T it mis-behaved similarly. New 'inner 
drivers' for the front axles helped both the bucking and vibration a lot. 
Motor mounts (especially the front one) helped. The modification described 
at <http://216.78.172.244/engine_folder/motor_mount_mod_9000.htm>
helped. 

New front wheel bearings _almost_ made the problem go away. I think the 
remaining play is in the transmission, and not economical to chase.

The classic 900 has real CV joints only on the outside ends of each 
driveshaft. On each inside end is a joint with three roller bearings spaced 
around it, which fit into three channels inside the 'tulip' that sticks out 
of the transmission. Finding the bad inner driver was tricky - both my 
dealer and I had checked them many times and they felt tight, but I finally 
happened to grab the driveshaft when it was rotated to the exact critical 
position and the inner end would move about 1/8 inch up and down! Rotate 
the wheel just a few degrees either way and it felt perfectly tight.

Hope some of this helps!

Loren

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