I was just posting for wordslinger on the same subject. If you replace the clutch pad springs w/ a stiffer set , it will allow the engine to turn higher into the "power band, and give you a better take off. I believe the post is under "white spring" from franx93. As far as the carb goes; There are 2 types of systems.. The MOST common is a fuel adjustment. This will have an adjustment screw that is tapered from threads to end. The idea is you are adjusting the amount of fuel being drawn from the float bowl w/ the air being constant. If this is the type you have the Idle jet is too big. The second is an air adjusted system. The needle will have a long shaft w/ a tiny taper on the tip. approx 1/4". If this is your set up, the idle jet is too small. Compensating w/ the screw is NOT a good idea because of the de-accel. factor. When you close the throttle the engine is still turning high rpm;s. You need the proper balance of fuel/air to keep the piston cool. An "open" exhaust will cause this. Rather than buying boxes full of jets, I use pin drills, or welding tourch tip cleaners to open mine. Find the one that fits, an go to the next step up.
