Re: Problems with full throttle
Welcome to the forums.
Sounds like either a gas problem of a reed problem. Gas problem, you change out the fuel lines for larger lines, modify the petcock, and put in an inline fuel shutoff valve. For the reeds, you need to do a little more.
If it's doing this at WOT (Wide Open Throttle), it could be your reeds. This is a phenomenon known as "top end reed flutter." As simply as possible, the reeds are like a one-way valve, opening to introduce the fuel/air mix into the cylinder, then snapping shut to seal the cylinder for the compression stroke. At WOT, your reeds are flapping back and forth so fast that they aren't sealing on the cylinder well, resulting in a loss of compression and thus loss of power. Solution here is to get and install new reeds on your machine, lilike a triple stage set (Black Widows are fairly popular), or do the cheap triple stage reed mod that davation came up with, done by layering two single reeds on top of each other. (Look in the air-cooled mods at the top of the air-cooled section for complete details on the mod.)
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