Author Topic: Hyway 660 066 pop up piston domed  (Read 623 times)

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Offline farmboy

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Re: Hyway 660 066 pop up piston domed
« Reply #30 on: September 09, 2018, 09:57:22 pm »
Compression w/ Hyway std. piston Hyway rings lightly oiled, .023 squish=160 psi using comp. gauge from Echo Spec. Ser. Tool kit.
Compression w/Hyway poptop piston w/Hyway rings lightly oiled =180 psi.  Did have to relieve skirts on both pistons to clear crank throws.
Shep
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