1975 mt 250
im Refurbing the exact same bike as yours 75 MT250 fun project if u haven't already done it i would pick up a engine seal kit off Ebay for $30 and replace the service side main seal mine was sucking oil out of the trans and fouling plugs it can be done with out cracking open the main case from the service side u have to pull off the clutch and crank gear but u can pull the bearing out and the seal a little tricky but not bad if u have the rite puller i made a puller from some 1/4 " steel flat bar 2 hole 2" on center and 2 6"x 1/2" bolts long shank cut them to 2 1/4" ground the tip down to a small oval so i could slide them in to the race and turn them to lock in and just back it out with the crank gear bolt i have pic's of it on my face book page if u need them
good luck on the project
mike
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