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yamaha 700 mag compression issues?

need advice on how to set compression, have 1 at 120 2 is 60 3 is 65 to 70 and 4 is bad....bike wont start need helppppppp
Sylvia, April 2013
sounds like worn rings or cylinders causing compression to be lost back into engine.check cylinder head bolts are torqued down properly.

xs11, May 2013
link Click here to see other fixes for Yamaha.