Question about 1983 Yamaha XS 400 L Maxim

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Handle bars shake up and down at 50-55mph

Hello my handle bars shake up and down at 50-55mph as if the wheel is out of balance, the bars sometimes have a small amount of flap at slow speeds. The bike is a 1982 xs400 maxim which I bought at Christmas, it passed its MOT a few weeks ago. The tyres and wheels look ok with not bumps or scuffs and the front wheel was balanced last saturday. The tyres have inner tubes and set to the correct pressure. The headstock feels ok and does not judder on breaking as it would if it were loose (the MOT guy would have picked this up as he is strict). The previous offer didn't use it for about a year. Any ideas what the problem is?

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Could be a few things I would recomend checking all the head bearings really good, it also could be a busted cord in the front tire. When this happens it usually causes a vibration at higher speeds

Posted on Mar 10, 2009

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There can be many reasons , so you will need to check down the list until the problem is solved.

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Hi there!

I have the same problem but i finally had it fixed.
Your front rim is warped. Have it aligned. Balancing alone would not do the trick as this would only balance the wheel on its vertical axis. (assuming they were able to balance it properly)

Jack the front end up and turn the wheel.. Have a screwdriver or any thing that can serve as a guide with the rim, turn the wheel and if it touches the screw at some point of the turn , then the wheel is misaligned. A new stock rim would cost too much so have it aligned with a good machine shop.

To give you an idea of what im talking about:
www.webbikeworld.com/Motorcycle-tires/wheels/

There's also a chance that the fork fluids would cause this. Fluid levels should be equal. (less likely)

Hope this helps!
I'd appreciate a feedback!
-levibit-
Motorcycle Mechanic
Specialty on Yamaha Bikes

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i think there is something wrong with the balancing of your bike... foremost may be your handle bar isnt alligned well. if it is..,then get your bike to the mechanic,he will open up your central handle bearing and will fix it..

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