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Mkcobra, the fact that it gets so rich thru the curve after being close to perfect means that the exhast is so restrictive that it requires a leaner mixture. Take those side pipes off and dyno it again. Or, I wonder if your balancer has slipped giving you an inaccurate timing reading. I would check that timing all the way to 5500 rpm to make sure it is not retarding for some reason. If its in the mid 30's, I would bump the timing up 5 degrees and see if it makes a difference. If it makes a lot more power, then your balancer has slipped. Any motor with less than optimum timing will require less fuel in the power band. Good luck, Scott.
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