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Recently did a top end rebuild on my 2008 WR450, took her for a short test ride no problem, sounds good felt great, took her for a longer rider and about 10mins in suddenly souldnt rev past approx. 4000 (red light coming up on dash). Babied her home but I am stumped.

Timing is good, TPS is within spec.

The only thing I can think of is the flywheel/magneto rotor was stuck on tight and to get it off to replace the timing chain required some heat, yes used the correct tool. What im currently thinking is that the heat caused the flywheel/magneto rotor to lose magnetism preventing the CDI from seeing where the crank is located.

She starts and runs fine at idle/low rpm.

Has anyone had a similar issue or can provide a solution?

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