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sounds like a carbed machine. it is just the nature of the beast that carbed machines are hard to start when cold. cold air is denser, has more air molecues in it, so it trying to start while really lean. giving it gas to get started is perfectly fine, actually that what i was going to recommend you do. when you give it some gas while trying to start, it allows extra fuel to get mixed with the air in the carb, thus riching up the fuel mixture until it can fire up. a different octane gas isnt going to help, its having a hard time starting because of the air, not the gas.
the only way to get it to fire right up when cold is going to rejet it, but that is a pain to be doing a lot of you will have to rejet it again when summer comes around. this is the advantage of EFI machines like our cars, and EFI atv's. they can compensate and adjust their fuel ratio to the elevation and temperature, carbed machines are in a fixed fuel delivery system
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