I agree with jeff up there^ You put too much oil in it. Drain the oil out, and put fresh in. Check it after one qt. , But I believe it takes about 2 if its completly empty. Dont quote me on that. Check it as you fill. It also wouldnt be a bad idea to change the oil filter, its a paper element, and should be changed at least a few times a year. Any dealer should be able to help you out, or a shop. While your at it, also check/change the rear differential fluid. Find a manual if needed. Good luck!
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes