The black chalky color is from the idle circuit. You need to do a full throttle run cutting off engine at end of run with throttle still fully open. Pick a strait mostly level road about 900-1200 feet long. From a dead stop accelerate to full throttle all the way through the 900-1200 foot run. With foot still at full throttle cut the engine off and do not remove foot until engine stops running. Having your plug wrench ready pull plug and inspect color. Now you know if the main jet is rich or lean. If lean increase jet from 110 to 112 and continue these steps retesting until the plug is a light to medium brown. Once your main jet is proper than you can work on the pilot or idle jet. Going from 110 to 125 will naturally run rich on a mostly stock buggy. As I stated earlier in a post the last HH I was able to get from HH had a 118 jet in a brand new totally stock engine .
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