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What tension do I need for my 1983 540 for it to engage at 5,000 RPM
Back in the 90s I bought a spring for my 1986 that engaged at 5 grand but over the years my memory has slipped.

Thanks
Lee

I run the gold spring in mine for 4400rpm but my uncle runs a blue spring and he gets abdout 4800 out of his.

The Comet Purple #207758A is around 4500rpm

See

http://www.hoffcocomet.com/comet/spring-engagements.asp

hoffco comet has engagement specs listed on there site by cam arm to spring if your running N weights you'll never get there use B weights will net you 4900 a spring shim will get you about 200 more rpm
Kevin