My son has a rotax max evo with the electronic power valve (2 wires earthed). We have been investigating an issue for a while now not hitting power band consistently down the straight. Engine just had a rebuild by Farley who serviced the PV. We also checked it ourselves and seems ok.
Example from 2 days ago... 10 laps engine temp consistent 58 degrees. Didn't hit power band 3 out of the 10 laps. About 13,500 RPM down straight when it does, 12,500 when not. Same session so same sprocket (81) and same jet (122 - restricted).
I'm out of ideas if anyone has a suggestion to test please?
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