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Had an issue last weekend.
5 minutes before the heat race, all of a sudden kart wouldn’t start on a stand. Quickly changed e-box and coil, it fired, got it out on a track.
Two laps into the heat race, engine stopped revving past 9,000-10,000 RPM. Couldn’t start it after the heat.
Tried electrical degrease on wiring harness connectors and it didn’t help. Installed a new wiring harness and it’s all good.