KUMHO ON VENTURE ROYAL STAR

ON FOR TWO WEEKS AND LIKE IT EXEPT IT HAS A WOBBLE OVER 70MPH HOW DO I FIX THIS.

I sold the bike! I researched this a lot, and there were several things to try. Do a thorough inspection of the bike. All the bushings and such. - My bike checked out fine.
Adjust the tire pressure- this didn't work for me.
How is the front tire? Believe it or not, swapping to a car tire on the rear can affect the front tire. Change the front tire if it's old or out of date.
Make sure the tire is balanced.

Like I said, I did a lot of research and this is a common problem. But BAD problem when you are trying to pass a car and get the wobble.

Good luck.

I think i got it, 50 psi in the rear and does pretty good.

I think you need to check bike for weak spots,shock bushings,steering bearings and pre load ect. the car tires tend to exagerate problems that you haven't noticed with motorcycle tire.When you have to run high pressures you are loosing the better ,softer ride and traction of the car tire and you will proubably will cause premature wear on the center tread thus cancelling most of the benefits of running the ct.