It will depend on what you want to upgrade. The least cost for engine upgrades are to remove the air box if not already done and replace with an open air filter. Several type are available such as the UNI filter which is a foam filter and has to be oiled with a quality filter oil. K&N which is double in price as the UNI and also has to be oiled, R2C filter which does not need oil about as much as a K&N to clean just use 40psi air. Replacing with either of these filters will require a rejet of the carb. Don't waste your money on hotter coils performance CDI's, with your stock engine they are more than efficient. Mods to the CVT, rollers, torque spring, clutch springs adjust shifting of the transmission but will not give you any more power. If power is what you want a performance head ported and polished with a performance cam is in order for a seat of the pants difference. Several things needed to know such as your location, terrain you will be riding, and what about the engine you feel is lacking and want to improve. You can give me a call to discuss. I can give you the best bang for your buck on your budget with quality parts.
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