Vintage Dirt Bike Q & A

what would cause an mt 125 to load up all the time. I changed the carb , put the correct getting in , new crank ,piston, rings, piston pin, cr head re timed it as well as changing the points and re timed it again, cleaned air filter. compleatly removed the oil injection and plugged the injection port in the cylinder so i am running premix. but still loads up all the time.
what could cause it to load up still?

My mt250 did this to me and it was a crank seal on the clutch side it would let crank oil in so much it would start dripping from the pipe it wouldnt rev out clean either. I put new seals in and it still did it I had to retrue my crank and then put in another set of seals and it worked great. I was able to lay my bike almost on its side with it running I held the handle bar and kept the bike off the ground a bit. It started to lean out real bad as the oil came off the seal and it let air in instead. It was the stator side I leaned it over on too see if it was the clutch side seal. I am sure there are proper ways to do this but thats how I found mine was leaking. I was also told I could run the bike with the tranny empty just not move the bike. Well I did this and my tranny went out a little while latter so I wouldnt advise doing that to see if it makes a difference. I know my tranny probably went out for another reason and this had nothing to do with it but it just seems like maybe it did.