it used to be perfect, maybe slightly flast to upshift but ran great. now it seems that somthing is up. there is a big open field i was riding in this weekend with a slight incline, it would hit a certain point on the gearing that it would jist not pull the rest of the rpms. coming back down the slight grade it eventually would reach full rpms. i think the
Engine is running fine, its the clutching. its not lile the enine is loading up either. plugs look good, maybe slightly rich but id rather be a bit rich than lean. its just a certain point in the range it just will no longer pull.
i don't think it would be rust, been running it for a good year with the clutch as it is. could the spring have slipped out of adjustment and backed some preload off?