How can I get some more speed out of my 300? I already have k&n filter, wb exhaust, & 14t front sprocket.

 

It looks like you've done all the easy and cheaper ones so getting into the engine would be the next step. A cam and piston would be helpful in optimizing the cc's you have without going into a full house engine build.

 

Drop it out of an airplane..just kidding..

well you did the easiest ones.

You can get a Wiseco High Compression Piston, some porting, a cam, new valve springs, and heavy duty rocker arms, and bigger carb.

Or a 313cc kit. The requires resleeving and stuff..it can be expensize..about 800 to 1000 for the whole motor. But damn it would run good.!

if you don't plan on racing the first one would be your best bet