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Depends how fancy you want to get. You can weld a small bung to the header and install a pressure gauge, but I can't recall the sweet spot number. I bet Google knows.
Another way is to simply uncork it and go for a ride. Keep an eye on the plug if you do that, because it'll be leaner. If your top speed increases, you freed up some horsepower.
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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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