Yamaha Crux Motorcycle

thanks for reply.. i ll check the wheel balance.

Put him on a stand and check the wheels and tires for runout; wobble side to side and overall roundness

check for vibration absorption pad , which is mounted on the frame of motorcycle and engine mounting bolt, it might be damage or loose, check for it.

Check your wheel bearings, or better yet, replace both front and back wheel bearings. Make sure you pack them with grease before installation. Worn bearings will induce a wobble.

Loose motor mounts or worn out elastomer mounts can cause severe engine vibration. You might check them.

It is not uncommon for engines to vibrate most at certain RPMs. Especially on motorcycles where the engine weight is a significant part of the total weight of the vehicle. I have owned many motorcycles and it is not uncommon to have RPM levels where they are fairly smooth and RPM levels where they are not very smooth even when everything is working correctly. The trick is what is correct for that particular bike. Ride two different bikes of the same model and see if they feel like yours. Also read a magazine road test to see if they mention it. You can imagine the engineering that goes into counterbalancing an up/down (piston) vibration with a weighted crankshaft (round and round). You might cancel out much of the primary vibration but have a left over rocking couple or two left over small vibrations 90 degree out of phase with the primary. That's why many manufacturers use isolators or secondary weighted shafts and probably other stuff too. When any of these forces act at a resonant frequency RPM it all vibrates more at that speed. There is also the separate issue of leveling out power pulses. Just ride a 650cc single. I have no idea what the engine configuration of a Yamaha Crux is so I do not know how this applies to your bike. Oh well, I've yammered on enough.

I am not saying don't check for problems but if the vibration is not severe it may be inherent in the design.

Your not stating what type vibration nor from area you suspect. Tire/wheel, drive train, engine. Also what type of vibe's. Can be wheel balance, shaft or chain area, primary chain, motor mount alignment?

Need much more info to even begin.

Is it in your hands, feet, butt, from front, back etc...MORE INFO!

thanks for reply. i felt vibration in my hands,and my back. i ride other bikes of same model ,but i cant find the vibration in that. i became so tired by travelling 60-70 km in a day. i think vibration come from my wheels.. i ll check for it.. let me see any changes after that..

Hell there: I would check the balance of your tires. Most tires have a weight on then for even weight and if that is not balanced then the tire will vibrate or bounce at different speeds. My BMW R75/5 would do it at 80 - 90 miles per hour. It is scarey at that speed. So if you are lucky that will cure it.