hi all.new here,glad to have found the site.question,on a 69 at1 125 enduro i,ve got excessive smoke at the exhaust.theres,smoke on idle,excessive on throttle,with bog down on engine,till it stalls.smoke at the exhaust,seemed to have came on from small amount to excessive smoking.is it possible the oil pump can be feeding too much oil ?noticed when i bleed the pump, it seems now the oil really comes out.dont remember it doing this.

It sounds like it was fine and then suddenly started smoking more?  (circumstances are important...  that would be a different situation than a bike that has been parked a few years and was just started again.)

Anyway, check the transmission oil level, it it's dropping you likely have a crank seal that is bad or popped out of the case.

is watching the stick on the transmission the only way to tell?