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2004 RMZ 250 runs and idles, but will not rev past 25%

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HELP!!! My 2004 RMZ runs, idles, but will NOT rev past the 25% mark. I can ride it, but once I get around that 25% mark, the bike just shuts down. I kick it once or twice, it starts back up, but it still will not rev!

It's very frustrating to ride at or below 25%, and of course it's very unsafe.

I've had the carb cleaned, put a new stator and CDI and harness on it, and just got a throttle position sensor (TPS) to try out.

If the TPS does not work, I'm stumped. What else could it be?????

Again, it starts and idles, I can even ride it, but it will not rev past the 1/4 throttle.

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