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Warm to the touch heat cycles every hour

I'm using a Toomey Exhaust and the jetting came with the 35mm keihin carb that said was calibrated to the big bore kit...And I'm using a pod filter that is big

So I rebuilt my engine with a Vitos Big Bore kit. Upgraded to a 35mm keihin carb and has a Toomey exhaust with a pod filter. I am in NY 1200 ft elevation. My gas mix is 32:1. After less than 10 hrs I fried the piston. My jetting was 68 and 168. Help! I need a better starting point for jetting..