How to Test for a Good Electrical Spark on a CRF250R

The CRF250R is a dirt bike manufactured by Honda Motor Company. The CRF250R has a single-cylinder four-cycle engine. The spark supplied by the spark plug is what creates combustion between the fuel and oxygen within the engine. A bad spark plug can negatively impact engine performance or keep the motorcycle from starting entirely. Checking the spark is a regular part of maintenance for the CRF250R. It takes about an hour to check for a spark.

Instructions

1

Remove the seat and trim panels with the socket set to access the spark plug.

2

Pull the spark plug wire from the plug with a pair of pliers. Remove the plug with a spark plug wrench.

3

Inspect the plug for damage. If the plug is dirty, clean it with a wire brush and then reinstall the plug.

4

Attach the end of the spark plug tester to the top of the Honda's plug and the other end of the tester to the plug wire.

5

Start the Honda and monitor the plug tester's gap. Inconsistent firing is a sign that you are not getting a good spark and the plug should be replaced.