Our ECU runs differently than the OEM ECU. Sometimes issues on the machine will show up with our ECU, while the OEM seems to operate fine.
Below is a list of common issues, and how to resolve them so that you can get your machine back into peak operating condition.
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|Cranks excessively, and only occasionally fires.||Battery weak.||The Copperhead requires at least 11 Volts to fire the sparkplug, and has a higher current draw than stock. Battery voltage when the engine is running should be 12-15 Volts. If it is below/above that, it indicates a bad battery or faulty voltage regulator. Typically issue is only present on cold starts. Try starting with a trickle charger connected to confirm.|
|Hard starting, random stalls.||Spark plug worn/fouled.||Replace spark plug.|
|Hard starting, stalling when coming off throttle, or poor performance.||Throttle position sensor (TPS) not centered properly.||Center TPS as per service manual.|
|Hard starting, stalling when coming off throttle, or poor performance.||Low fuel pressure.||ECU requires 42-43PSI at the fuel injector when the engine is running for proper operation.|
|Engine requires a lot of throttle to keep running.||Manifold Air Pressure (MAP) sensor hose kinked on crimped.||The MAP sensor is a ~1" black plastic cube that measures air pressure. If the 1/8" black vacuum line connected to it is kinked or crimped, the reading is improper. Unkink hose.|
|Repetitive start/stalls when cranking||Defective Voltage Regulator.||Unplug regulator to confirm that ATV starts fine.|
|Cranks but kicks back repeatably.||Valve lash set incorrectly.||Adjust valve lash as per ATV user manual.|
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