Vintage Dirt Bike Q & A

Hello, i have a 1971 suzuki ts 125 duster that i can run when cold but once it warms up it will bog down to eventually killing it self. I have to wait till cooled down so i can ride it again. (5min ride for a 20min cool down) Also when i do ride it, it won't go over 45mph in 5th gear. It will just hipe and try to buck you off. I've cleaned the carb twice this year. When your stopped and N I can play with the throttle and coke to get it to rev all the way but in gear and moving it just hipes. I do have a different carb on it now thinking it would help with all this but it didn't make a difference.

Please help, i want to get it street legal sometime in the next couple of years.

Thanks,