I had the same problem, my quad would wobble horribly when i would hit about 50. Come to find out, its because i put slime in all four tires and it made the balance go out of whack. I dont know if you use slime but thats one posiblity.
Make sure the handlebars are straight, then make sure both tires are pointing straight forward. To do this, measure from the inside of one tire to a point on the chassis. Make a note of the distance. Repeat this measurement for the other front tire. The reference points on the frame need to be equal distance from the centerline of the vehicle. The measured distances needs to be the same to verify that the tie rod initial settings are equal. Adjust the tie rod ends as needed. Now you may start your toe adjustments. On the leading edge of the front tire about half way up, place one end of the tape measure on the center tread of the tire and take a measurement from the same point on the other tire. Record this measurement. Then repeat this measuring procedure for the rear of the front tire the same height from the ground as you did for the front measurement. Record this measurement. The front measurement needs to be at least ¼ of an inch less than the rear measurement. Always make equal adjustments to both tie rods. More toe-in will decrease the speed and accuracy of your steering input but will increase stability upon deceleration.
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