Need a little cam chain help.

I have a yz250f dose anyone know how tight the cam chain should be?


Yes.  There is an automatic cam chain tensioner, and if its working properly, it will tension the chain exactly as it should be.  If its not working properly, then there will be valve noise.  And no, I can't describe it.

if the cam chain tensioner is working properly the cam chain is pretty darn tight.  it needs to be to spin the cams at 6750 rpm

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