It may be necessary to change the size of the jet in your carburetor. Perhaps the weather has changed, the altitude id different, maybe you put on a different exhaust pipe. Things like this can cause your motor to run "lean" or "rich". Then your motor will run like crap, or even seize. That's bad. an easy way to know if your 2-stroke engine is running lean or rich is to take out the spark plug and look at the electrode. If it looks white, you're running lean (not enough fuel). If it's black, your running rich (too much fuel). You might also notice that you're running lean if you give full throttle and the motor seems to not want to respond. If you're rich, the motor will be boggy and make a noise like a sick goose (referred to as 4-stroking). anyways, let's jet your bike.
I'll show you how to do it.
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Check it out here: www.techshop.ws