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Cam chain


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Word from the yamaha dealer is that my cam chain's stretch slightly. Engine still runs ok, but it's not a problem i want to develope.

I been reading through the old haynes manual and it seems to just replace the chain you need to.

-remove inspection cap on head

-remove chain tentioner

-remove cylinder head

-take chain off cam sprocket

-fit new chain.

It's getting the chain round the crank sproket i'm worried about, i can't think of a way to do it without stripping the whole engine down.

Unless the cam chain has a breakable link, in which case i can attach the new chain to the old, pull the new one through the bottom end, then link the new own too itself.

Books recons you can find TDC using markings on the generator rotor.

I'm not very experienced at all this, but i don't wanna be the sucker paying yamaha oodles to do everything, so some pointers would be nice.

It's an SR 125.

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