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On my 91 indy 650 they bored out 1 piston .020 over and i was wondering if i would have to set the plug gap different for the bored piston.Thanks!
And also i think this is weird but i have to change my plugs about every 30-40 miles because they foul out and start making it bog. Thanks Again
 

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i wouldnt think it is to good to bore just one cylinder,wouldnt it throw the balence of your motor off and ruin it??fouling your plugs that offten isnt normal not sure what would be wrong or about your gap issue
 

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.20 is fine to bore one cylinder.The balance is fine.No need to gap any diff on the bored cylinder.The plug fouling sounds like too rich.
willie
 
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