C
A 670 with a crank issue, wierd. My instincts have been telling me it's got to be an ignition fault somewhere. When I get back to town I'm gona try new cdi and coils just for kicks.
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Check to make sure the crank isn't out of phase
you really dont need to run av gas. its to high of octane for a pretty much stock motor. it wont burn hot enough cause of the octane.
Rob
p.s. what was the problem?