Yamaha YZF-R125 Service Manual: Checking the ignition spark gap

Yamaha YZF-R125 Service Manual / Electrical system / Electrical components / Checking the ignition spark gap

1. Check:

Ignition spark gap Out of specification Perform the
ignition system troubleshooting, starting with step 5.

Refer to "TROUBLESHOOTING" on page 8-3.

NOTE:

If the ignition spark gap is within specification, the ignition system circuit is operating normally.

a. Disconnect the spark plug cap from the spark plug.

b. Connect the ignition checker "1" as shown.

Checking the ignition spark gap

2. Spark plug cap

c. Set the main switch to "ON" and the engine stop switch to " ".

d. Measure the ignition spark gap "a".

e. Crank the engine by pushing the start switch " " and gradually increase the
spark gap until a misfire occurs.

Checking the ignition coil

1. Check: Primary coil resistance Out of specification Replace. a. Disconnect the ignition coil connectors from the ignition coil terminals. b. Connect the pocket tester ( × 1) to ...

Checking the crankshaft position sensor

1. Disconnect: Crankshaft position sensor coupler (from the wire harness) 2. Check: Crankshaft position sensor resistance Out of specification Replace the crankshaft position senso ...

Other materials:

Fuel tank cap
Fuel tank cap Fuel tank cap lock cover Unlock. To remove the fuel tank cap Open the fuel tank cap lock cover. Insert the key into the lock and turn it 1/4 turn counterclockwise. The lock will be released and the fuel tank cap can be removed. To install the fuel tank ca ...

Replacing the air filter element and cleaning the check hose
The air filter element should be replaced at the intervals specified in the periodic maintenance and lubrication chart. Have a Yamaha dealer replace the air filter element more frequently if you are riding in unusually wet or dusty areas. In addition, the air filter check hose must be ...

Checking the drive sprocket
1. Check: Drive sprocket More than 1/4 tooth "a" wear Replace the drive chain sprockets as a set. Bent teeth Replace the drive chain sprockets as a set. b. Correct 1. Drive chain roller 2. Drive chain sprocket Checking the rear wheel sprocket Refer to "CHECKING AND R ...