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80" shovel/ 9.5:1 wiseco's/ 93 octane fuel

I just rebuilt my top end entirely and have begun to notice some detonation in 5th and 6th gear when I wick the throttle wide open..
The pistons I replaced were 9.5:1 wiseco's as well...
Checked my timing...I'am 32 degrees advanced (35-40 is the spec I believe)

so what give's? Should I just keep retarding my timing until the bike runs like a damn turtle but doesn't ping.....? I've got a set of heavier duty advance springs I might try out...anything look/sound abnormal here?

thanks in advance!
 

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with fresh rings, even with the same pistons, you'll get higher compression because less gas escapes past the rings. why not just limit your advance, instead of retarding it more?
 

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If your 5th and 6th gears are tall as hell wicking on the throttle is going to put a pretty big load on your engine. 9.5:1 is still relatively low compression in the grand scheme of things running 87 in an engine with a nominal compression ratio like that shouldn't even give you any troubles.. It might be the matter of a degree or two causing it to ping.. Does it do it in any other gear? Do you have your valves adjusted correctly?
 
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