1966nova Posted September 17, 2007 Report Share Posted September 17, 2007 i have a cub 68mm with vito head,inframe sheares,+7 timing 35 carbs i currently was runing av gas 100ll 32.1 and seems fine the compression is 185 do i really need higher octane????? thanks alot..... i mostly trail ride little and race on some loose dirt thanks greg Quote Link to comment Share on other sites More sharing options...
06BaNsHeE Posted September 17, 2007 Report Share Posted September 17, 2007 Yea you need 110 or higher with that timing and compression Quote Link to comment Share on other sites More sharing options...
1966nova Posted September 17, 2007 Author Report Share Posted September 17, 2007 yep thats what i was thinking so how does pinging sound???? i do hear ringadinddind noise when cruising slow in third from the headpipes makes a dinging sound like a rock is in the head pipe??? is that detonation?? it runs great plugs look good on the 100LL Quote Link to comment Share on other sites More sharing options...
Coupelx Posted September 17, 2007 Report Share Posted September 17, 2007 yep thats what i was thinking so how does pinging sound???? i do hear ringadinddind noise when cruising slow in third from the headpipes makes a dinging sound like a rock is in the head pipe??? is that detonation??it runs great plugs look good on the 100LL i would say that is detonation. Quote Link to comment Share on other sites More sharing options...
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