Carbs have jets and that depends on a number of things. About the best is to just order a kit (find them on ebay in 10 piece for normally around $10). You'll need to learn to read the plug and change it accordingly.
Oh and I forgot if it has the vacuum petcock on the gas tank order a spare one now if you plan on running it. They go bad every time you turn around. Most of us swap out to a manual one. You have to remember to turn it on and off but they last forever.
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