If you haven't run gas before just remember to change the clutch every 3-4 runs (IIRC). My mate buys brake pads (real car) and cuts peices off and re-shoes the clutch. If you upgrade and get a 30cc big bore kit on a decent motor, you'll need to change the clutch before one full tank of gas.
The other thing is expence (sp?) I beleive large scale buy parts less but are more expensive. If it works out the roughly the same i don't know
