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Fellow yz is desperado and needs help on engine assemble

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🙂 I bought a yz 250 1996 it has a different year motor on it! The last owner did not know the year exactly, it went to a complete rebuild then on the test ride it blow a seal, on the left side were the crank shaft connected to the case. Make a long history short he is done w/this bike he do not know what cause the failure he know that he bought a new piston rod and it my be or not the right one! My question is any one knows how should I approach this problem? Were can I find a detailed manual on yz motors? It has to be more detailed than clymer and the Yamaha micro fish! Any help will be great appreciated!

Thank any one for any impute

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Go to Yamaha USA online. They have manuals that the bike technicians use for sale (but they are pricey) and if you knew what year your motor is they have exploded diagrams you can surf.

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were can I finde the exploded diagrams that are u talking about?

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