I have a Jia Jue 150T-4G. 2010model has done 3000ks. The problem is a severe shake through the handle bar if you take your weight off,steering with one hand for eg,I have had the bearings checked,wheel balanced,still shakes,any ideas?

SOURCE: SHAKE

Steering head bearings not correctly tightened. Play in forks, poorly balanced wheel, too much rake... shrug.

SOURCE: Handle bars shake up and down at 50-55mph

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

SOURCE: handle bar vibration/shaking RVF400

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

SOURCE: I have a 1982 V45 HONDA SABRE VF750S motorcycle.

I had the same problem with mine last year. I put a new tire on it and had it balanced. The vibration went away. I would at least have your tire balanced.
Ben

SOURCE: Silencer Shake

you got it