Keith Dove Posted July 24, 2010 Share Posted July 24, 2010 I recently purchased two (2) Yamaha 125's (AT1-C) from my father. I still remember the day in February in 1972 when we drove to Decatur Georgia and purchased two 125's, one 250, and four 80's. The family was now in the motorcycle riding business. We had some of the most wonderful times of my entire life while we were exploring the Georgia countryside on our Yamahas. One of the two 125's I bought from Dad is leaking transmission oil into the crankcase. The engine is blowing white smoke and will hardly run because of this oil. My question is, can I simply remove parts making my way down to the seals without tearing down the entire engine, or will I have to plan on tearing down the entire engine to fix this? If I must teat down the entire engine, does Yamaha make a complete gasket/seal kit for this engine? Thanks so much for your help. Keith Dove (850)535-9937 www.paintballshoppe.com Link to comment Share on other sites More sharing options...
Moderator Cynic Posted July 24, 2010 Moderator Share Posted July 24, 2010 I recently purchased two (2) Yamaha 125's (AT1-C) from my father. I still remember the day in February in 1972 when we drove to Decatur Georgia and purchased two 125's, one 250, and four 80's. The family was now in the motorcycle riding business. We had some of the most wonderful times of my entire life while we were exploring the Georgia countryside on our Yamahas. One of the two 125's I bought from Dad is leaking transmission oil into the crankcase. The engine is blowing white smoke and will hardly run because of this oil. My question is, can I simply remove parts making my way down to the seals without tearing down the entire engine, or will I have to plan on tearing down the entire engine to fix this? If I must teat down the entire engine, does Yamaha make a complete gasket/seal kit for this engine? Thanks so much for your help. Keith Dove - www.paintballshoppe.com Firstly phone numbers in open forum is asking for trouble. Secondly, yes on both counts. Tearing the engine down is nessesary and you can get all the bits. TY Trials are TY/DT specialists in the uk and carry it all on the shelf and ship worldwide. It has been said that you can change them whithout tearing the motor down but if the crank seals are gone the mains are likely to be very worn (one of the causes of seal failure) and all the other seals on the motor will be shot or nearly. One certainty is the output bearing and seal being shot and they require even more stripping than the crank as the gearbox cluster has to be removed. Sounds heavy but in truth a good spanner set, heat gun, flywheel puller and a torque wrench and its a pretty straight foreward affair. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted July 24, 2010 Moderator Share Posted July 24, 2010 Firstly phone numbers in open forum is asking for trouble. I agree but why quote the number...he cannot delete it from your quote Link to comment Share on other sites More sharing options...
Moderator Cynic Posted July 24, 2010 Moderator Share Posted July 24, 2010 I agree but why quote the number...he cannot delete it from your quote Hmmm, i chopped a big chunk off the end Chopped it all out now. Link to comment Share on other sites More sharing options...
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