New Engine

ohh yeah I remember now... if the stock derailleur is in working order the best way to make the bike go faster would be a sick bikes shifter kit. It will let you take advantage of the taller gears by transferring the drive energy to the other side through a jackshaft to the stock bottom bracket.

To make the engine perform better you can buy a better engine (the better quality engines are smoother and more powerful). You can replace the air filter with one of the sick bike replacements, you can replace the stock muffler with the high performance one from sick bikes as well. You can port match the intake tube to the intake port. You can also buy a better carb... cant really tell you which one because I haven't gotten that far yet. But all the other stuff I know is good from experience.

I have heard you can mill down the head a couple of thousands of an inch by putting a piece of fine grit sand paper on a flat table, but I haven't tried that either.
 
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