any way you can get hold of a cdi (ecu) to swap over for a test, that might be a easier way of testing it.
is the exhaust blocked in any way ie carbon, mud wedge down it.
long shot I had a connection on the cdi come off it ran like that. run over the loom and check its all connected up.
hope you get it sorted
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03 ec300
honda cr500 94
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