Mine used to do this if I took it to the "power car wash", would only go to 2700 rpm. Seems my Ignition Module and Fuel Injection Module were getting wet. . Sometimes pulling the modules and circuit breakers out and cleaning the contacts helps. . I also put WD-40 on the contacts. . haven't had the problem since. also the computer is under the ride hand side cover. . never hurts to make sure all your contacts are clean and well made
Probably insufficient fuel, check your filter. If it's carburated the float level may be too low or it may require rejetting, especially if you changed the exhaust.
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