get more power

everybody wants more power so here is how to increase the power of you bike or whatever you've got.

2-stoke engines: 

     weed-wackers: weed-wackers typically get around 10,000 rpms max and theres not much you can do about that but you can change how long it takes to get up there.

• you CAN'T turbo/supercharge a weed eater it just is impossible the way they work.
• you can increase compression by shaving the cylinder head (be careful about spark-plug clearance)
• you can index the spark-plug by using washers to get it properly aligned 
• you can gut the exhaust
• you can add headers
• you can add a tuned exhaust 

thats pretty much it...

4-cycle engines:

     these typically get 3600 rpms governed but the cool thing is, you can change that as well as the torque.

• you can turbo/supercharge them
• you can remove the governor 
• you can get heavier valve springs 
• you can shave the cylinder head
• you can index the spark plug 
• a performance carburetor 
• a header/ performance muffler
• you can get a bigger camshaft
• you can get a larger crankshaft
• you can get a lighter flywheel

there is probably more but this is all i can think of...