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info on top end 86 XR250r

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I just bought this bike and the top end came in a box.I bought all new gaskets,rings,piston,the whole deal but i can't get the timing right how do you set the timing on a bike that is not factory pre set?

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I'm assuming you mean its the cam timing that you're setting. its really quite easy.

1- Remove the two small caps off the left-hand crankcase cover.

2- use a 17mm socket and ratchet in the bottom hole where there is the flywheel bolt, turn the engine over slowly until a T mark on the flywheel appears- line this up with the mark on the top inspection hole.

3- place the cam in the head and install the cam chain and sprocket on the cam, the are two marks on the cam sprocket, these should line up parallel to the top of the cylinder head.

4- double check to make sure the flywheel hasnt turned while you did step 3 then install the cam sprocket bolts with a little loctite.

Finished!

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