Gearing
Gearing is probably one of the most important things to do. not only the countershaft sprocket but the rear sprocket as well. If you are not usig first and starting out in second then you obviously have the wrong gears on the bike. I raced a 175 Kawasaki 2 stroke on a real rrace track and in the end I was actually beating the other 175's and one of the two Honda Elsinores. Changing over to Synthetic AMSOIL 2 stroke oil and actually putting a splash of it in the tank will improve compression. get your carb set perfectly for the pipe and you can actually change the timing of your pipe (like karting does by adding in a piece of pipe between the motor and header pipe...lengthing or shortening it makes a big difference using the same expansion chamber. Seriously you can send a new pipe in and have it thermal barrier coated inside and it will improve performance as the gasses flow quicker and heat is not retained in the pipe. There are dry film lubricants that are applied electronically, do a little research. Then too tires and tire pressure play a very important role in performance. Make sure you find the lightest sprockets and chain...soak you chains in hot parafin wax then pull them out and let them hang to cool off and pull the parifine wax inside and have several chains, get rid of any dead weight that you are allowed to get rid of...can you get lighter tires or wheels...polishing the carbs inside for better airflow, use a K&N airfilter, find out if the front forks are bottoming out (use a nylon zip-strip) for measure in movement. same thing as the rear shock (you may have to change the fork springs or oil viscosity) is it illegal to run a 12Vdc muffin fan inside your airbox for extra bottom end...instead of having idle set at 1500RPM do what the big boys on the race track do and set you idle so that you have very little lag throttle power curve, increase it to 3,000 rpm you have a clutch and brake...If you are allowed remove the sponge foam seat and use the closed cell foam white stuff used in boats. 1" of the foam = about 4 inches of the yellow bike foam...