660 rhino always performed a little above midrange, fiddled with carburetors and everything else you could think of for a year and got rid of it when i saw the video youtube about the reverse switch failing and asking the ECM to slow down, yamaha installed it so you can't fast reverse. If it fails, it thinks you're going backwards and cuts off the revs. The rear tick will flash on the reverse console from time to time. If you are in forward gear, high or low forward you can bypass the sensor by simply grounding the wire connected to it to the motor case
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