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Valve spring kit for Honda GX390 engines. This is a set of single wound valve springs rated at 40 lbs. @ 1.200".
Spring Height to spring force specs (these are approximate spring force specs and could very 5%)
1.200" = 40 lbs.
1.100" = 50 lbs.
1.000" = 60 lbs.
.900" = 70 lbs.
.800" = 85 lbs.
.700" = 95 lbs.
.600" = 110 lbs. Coil bind occurs at .600" spring height
