slopoke Posted July 11, 2009 Report Posted July 11, 2009 I am currently running 350 mains 27.5 pilots 2nd clip from top on needle.(sealevel) I have about 220 psi of compression and on pump gas it was pinging. It is at +4 on timing. On pump gas it would run out fine. When I went to the 100 LL it seems rich on the top side but the engine runs cooler and pulls alot better until it tops out then it kinda bangs, It don't do it with pump gas but power loss is noticiable. Quote
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