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Ignition System

The Honda CRF450R uses an AC Capacitor Discharge Ignition. The ignition timing is set at the factory and is not adjustable. The timing only needs to be checked if and electrical component is replaced. To troubleshoot the ignition system, you will need a digital multimeter and a Peak Voltage Adapter (PVA). Perform the following checks.

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.


Start the engine, and let it warm up to operating temperature.

Stop the engine. Remove the timing hole cap with a 6 mm Allen. Inspect the O-ring for damage and deterioration. Attach a tachometer and timing light, and start the engine.

Consult the Electrical Specification topic for more information on timing.

Coat the timing hole cap threads with fresh engine oil. Install the cap and O-ring. Torque the cap to specification with a 6 mm Allen.

(Specification for Timing Hole Cap torque is 6 N-m or 4.4 ft-lb)

Spark Plug

Check the spark plug to see if it is the correct type and gapped properly. If the spark plug is black and fouled, replace it. See the Spark Plug topic for more information.

Connect a known good spark plug to the cap and ground the plug to the frame. Kick the engine over and check that the plug will spark. If the plug does not spark try the procedure again with a known good ignition coil.

Caution: Do not touch the spark plug or spark plug wire while cranking or running the engine as this can result in a severe shock.

Ignition Coil


Remove the fuel tank. See the Fuel Tank topic for more information.

Remove the spark plug cap from the spark plug.

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