another tri moto problem

[holmstrom]

Would bad crankseals cause a yt125 to blow smoke out the exhaust and run like crap. I dont mean smoke, i mean blow liquid oil. I took my silencer off and it was full of oil. I changed the tranny oil the other day and it still loooks clean, but the oil it blows out looks like dirty nasty oil. It ran fine 2 days ago, tried starting it today and it wouldnt but finally did. Now the idle speed goes up and down and stalls.

[Howdy]

Yes, the crank seals could cause this problem. Clean / Fresh Oil that goes through cylinder will get burned and can / will look nasty when it comes out.
Howdy

[42F67N]

My 125 tri moto that i just finished did that the first time i ran it but i chalked it up to bad premixing from the previous owner cause it dosent do it now.

[holmstrom]

My transmission seems to be filling with gas. I'm not sure if its doing it while running or while sitting. So ive been running it for awhile, then unhooking my gas line when its not running to see. Also if i take the tranny oil fill cap off when its running oil and air blows out. Is this normal or have my crankseals gone bad? I was thinking there shouldnt be any pressure in there unless seals were leaking.

[Six Stroke]

Correct. New seals are about $6 from Yamaha.