Hello everyone.Here‘s the situation: I have changed the oil, spark plugs, air filter, and recharged the battery and the bike starts up and runs just like new. The tires have been inflated to optimum (both tires instruct to inflate to 40 psi) and the chain is freshly lubed. It runs great except at about 38-42 MPH where it then develops a wobble. If I take my hands off the bars it will start to wobble violently very quickly. This only happens around the posted speed range. Any higher or lower and it cruises nice and smooth. Does anybody have any idea why this happens. I am open to all suggestions. Also the tires appear to be aligned and I have 10,000+ miles on the bike.Thanks for your help.
sorry but u bought the worst tires on the market if michelin was what was on it sell those get new set michelins youll b happy ////good lucj
First off - the tires are over inflated. The numbers on the sidewalls of tires are the maximum pressure the tire will safely hold without causing damage. Look in your owners manual for the proper tire pressure recommendations - or there may be a sticker on the bike with that info. Tire pressure on small bikes is approx 28F 32R Sportbikes 32F 36R Scooters 22F 25R
This not actually a problem. Every motorcycle will have its own vibration frequency (resonance), which is a function of the mass and flexibility of the structure. It's unavoidable, and the manufacturer takes it into consideration in the design of the bike. It can be tuned to a less dangerous frequency. This is why your bike wobbles at 40 mph, not at 70 mph: It's safer. Your arms are taken into consideration in the design, so when you ride no hands you have removed the dampers from the system. The inflation pressures of the tires will affect this vibration, since these pressures influence the flexibility of the tire sidewalls. These, too, have a damping effect. More appropriate (lower) tire pressures will no doubt lessen the wobble, and a different choice of tires will also change this characteristic, hopefully for the better. Bottom line: Use correct tire pressures, always have at least one hand on the 'bars, use a matched set of tires, make sure your wheels are true, your wheel alignment is good, and your shocks and springs are not worn out
You bought some cheap tires, my mom did the same thing and her tirs make so much noisedepends on how long u had them maybe they will exchange
