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When you raise the compression on a stock 865 cc to 10.5 or 10.8 EFI bonneville do you need to change your map or will the stock map work just fine ?
 

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The stock map should work OK as the quantity of fuel/air going into the cylinders remains the same, but you might experience knocking if a higher fuel octane rating is not used or alternatively retard your ignition timing a little.
 
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