257 is the basic carb. 644 has a gas priming bulb on the top. 1027 is the big bore carb. Not sure what the bore is. Most run the 257. I have several with different bores. Also have knife blade mods done to shaft and butterfly.
Mike
I believe the 1048 is referred to as the big bore.Good to know. I saw it some where calling it a big bore carb. Cant for the life of me remember where. Maybe they just ment big venturi.
There are intakes that will bolt up a wyk like it needs and even ones that will supply pulse internally.
Walbro 499 is for methanol. The 1048 will not jet on alcohol.
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