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GOT A 97 XLT600SP, JUST GOT DONE REBUILDING THE ENGINE,NEW WISCO PISTONS,BORE JOB AND REBUILT CRANK,PUT 300 MILES ON IT AND COOKED THE CENTER CYL. IT HAS SLP PIPES ON IT WITH 280 MAIN JETS, SHOULD I JET IT EVEN RICHER?
THIS IS THE 3RD TIME THIS HAS DONE IT.ANY INFORMATION WILL HELP.
 

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What color are the other plugs? Also what temp was it? Do you change jets with the temp? If I recall I had up to 300 or 310 on XLT SP but it was very modified. So your not too far off, I would think you've got an air leak in the center cylinder. shane
 
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