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Message: [QUOTE="Adrenaline, post: 221844, member: 25409"] I always thought a black spot underneath was fuel leaking under the piston then attatching itself and exploding from the heat. Thats what i've always been told. It can cause a nice hole in your piston though! 125psi isn't bad how about a little under 100psi without a leaky tester? try that for size lol. Change that there piston before 70 hours comes around next time youngin your a lucky soul indeed! :cool: The best way to jet a bike and get proper readings is to do it this way -Go to your local store and buy a handful of BR8EV plugs -Switch your plug out and then start the bike up and keep it running in the pilot circuit only! when enough time has passed for the plug to turn it's color kill the engine and change the pilot acording to whats needed. Tan plug don't mess with it, black go to smaller pilot, whitish go larger pilot if not u'll have a toasted piston if ya will :eek: -Repeat the steps and slowly go to each of the different circuits this will dial the bike really close to what you'll need. You may need to raise or drop the clip and turn the airscrew a little to fine tune it but it will but you on the mark. Hope I helped;) ADR [/QUOTE]