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Message: [QUOTE="BSWIFT, post: 1435817, member: 16802"] Likely going to have to start about 2 sizes smaller in general. Start with your low speed circuit and get a reasonable idle. Test ride from idle to 1/4 throttle and don't worry about the sputtering above 1/4 throttle. When you have a satisfactory response at lower throttle settings, move to the main jet. Drop one size at a time and test from 1/4 to 3/4 throttle settings. If you experience small hesitations don't panic, look for the overall best results. Once you've got your baseline, work with the needle position and air screw to fine tune. You'll get rid of the hesitation and bogging near the end. There was a thread on two-stoke tuning called Spanky's tuning guide. If you can find it, it works. Just be sure you only make one change at a time so you can determine better or worse for that change. Changing too many things will leave you chasing your tail and frustrate you beyond belief. [/QUOTE]