I recently rebuilt the top end of my HT engine (new cylinder, piston and rings). I have probably 50 - 70 miles on it since rebuild and it is really running in well - much smoother and pulls stronger now. So now it is time to tune it up a bit. Here is where we are at: -motor is a 66cc gt-5 -broken it on opti-2 at 72:1 -all else is stock -stock jet and needle all the way down (clip at top notch) -idles great -4strokes at mid-throttle almost all times unless under high load (such as steep incline) -wot runs really smooth but will 4 stroke at times -plugs look good to slightly rich at mid throttle and wot So I am thinking it is time to step down to a smaller jet and raise the needle a few notches. I ordered the .68mm and .66mm sized jets from SBP and they should arrive in the next day or two. Do you think I am on the right track?