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If you can't find a smaller main jet, you can clean it, fill it with solder and then drill it to whatever size you wish. The numbers on a jet generally refer to mm diameter, so a 100 is 1.00mm. Let's say you wanted to try a 95 jet; ask Google what the inch conversion is (it's 0.0394") and then look that up on a drill chart to determine the drill bit number size (it's a #61 or #60). Carefully drill out the jet to that size and give it a try. It takes lots of experimentation, but you'll eventually nail it. Be sure to write the size on the bowl with a Sharpie each time, so you don't lose track.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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