Maintenance & Technical > KX500 Original

KX500 crank truing and balance

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husqrider:
has anyone had experience truing a crank or having it trued? I was wondering about the difference this would REALLY make and what it cost to have done. Also what is there on shimming the rear motor mount to help with cutting down on vibrations? I have read in the magazines about these things being done, but no actual facts on what is done or by who.
thanks

Paul:
I've ridden a KX500 with a balanced / trued crank and it is awesome. The engine is so smooth you won't believe it and the vibration is no longer in your hands. When the ol compression meter tells me that the time has come for a new topend I'm sending my crank to Crankworks in Tempe, AZ and having that work done to mine. As far as the shim thing to the rear mounts, I've never heard of that one.

mikesmith:
I havent done it yet,but Ive read about shimming the rear motor mount in a few articles on preping KX500s.I would ask Destry Abbott about it,he should know.

Z1R:
I had the crank in my 82 Z1R balanced, trued and welded.  What a difference it made on that bike.

Of course this may not be an accurate comparison (4 cylinder 4 stroke vs Single cylinder 2-stroke)...but it's not unusual that Kawasaki cranks can benefit from this type of work.

Rick:
When I get my new bike each year or two, I pick the one off the floor with the least amount of vibration.  I then run vibration dampners in the bars.  When it's time to rebuilt the crank, the crank is trued.  You will not believe the difference.

The first time we did this was on a bike 100% provided by a sponsor.  Since we just had to take the bike that was delivered, we found that the vibration was so bad, your eyes were sore after a long ride (true statement). We pulled the motor and crank, and had it trued (by the Honda shop, as they have the best mechanic in the state).  What a difference!! :shock: After that experience, all cranks are trued on rebuild.  Also, if I ever get another bike that has to much vibration on delivery, I would split the cases first thing.  If you can pull the crank yourself, it really should not cost much at all.

Good luck.

Rick

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