Under the right side clutch cover could easily be the problem! Take it back off, and look at the shift machanism for a start. You will never know what it is until you rip back into it! Second time has to be the charm. Did you use a manual the first time you had it apart? I would have a manual as a reference and a guide to help you on your quest. 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