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Suzuki GSX-R 1000 Owners Manual: Spark plugs

Your motorcycle comes equipped with ngk cr9e or denso u27esr-n spark plugs. To determine if the standard spark plug is right for your usage, check the color of the plug's porcelain center electrode insulator after motorcycle operation. A light brown color indicates that the plug is correct.

A white or dark insulator indicates that the engine may need adjustment, or another plug type may be needed. Consult your suzuki dealer or qualified mechanic if your plug insulator is not a light brown color.


An improper spark plug may have an incorrect fit or heat range for your engine. This may cause severe engine damage which will not be covered under warranty.

Use one of the spark plugs listed below or equivalent.

Consult your suzuki dealer or qualified mechanic if you are not sure which spark plug is correct for type of usage.

Plug replacement guide

Suzuki GSX-R. Plug replacement guide


: if the above-named plugs are not availale, consult your suzuki dealer.


: this motorcycle uses resistor-type spark plug to avoid jamming electronic parts.

Improper spark plug selection may cause electronic interference with your motorcycle ignition system, resulting in motorcycle performance problems. Use recommended spark plugs.

Spark plug removal

  1. Lift the fuel tank by referring to the air cleaner section.

Suzuki GSX-R. Spark plug removal

  1. Remove the bolt 1.

Suzuki GSX-R. Spark plug removal

  1. Loosen the screws 2.

Suzuki GSX-R. Spark plug removal

Suzuki GSX-R. Spark plug removal

  1. Disconnect the and 3 Couplers 4
  2.  Pull out the three tubes 5,6 and 7.
  3.  Remove the air cleaner box.

Suzuki GSX-R. Spark plug removal

  1. Release the connector locks and disconnect the connectors from the spark plug caps.
  2.  Extract the spark plug caps.


Improper removal of spark plug cap can damage the ignition coil in the spark plug cap.

Extract the spark plug cap with your hand. Do not use pliers.

Suzuki GSX-R. Spark plug removal

  1. Remove the spark plug with the spark plug wrench provided in the tool kit.


Dirt can damage your engine if it enters an open spark plug hole.

Cover the spark plug hole whenever the spark plug is removed.

Spark plug cleaning

Suzuki GSX-R. Spark plug cleaning

To maintain a hot, strong spark keep the plug free from carbon adjust the gap to 0.7 - 0.8 Mm (0.028 - 0.031 In) for good ignition.

Use a thickness (feeler) gauge to check the gap.


To install a spark plug, turn it in as far as possible with your fingers, then tighten it with a wrench.


A crossthreaded or overtight ened spark plug will damage the aluminum threads of the cylinder head.

Carefully turn the spark plug by hand into the threads until it is finger tight. If the spark plug is new, tighten it with a wrench about 1/2 turn past finger tight. If you are reusing the old spark plug, tighten it with a wrench about 1/8 turn past finger tight.


Improper installation of spark plug cap can damage the ignition coil in the spark plug cap.

Install the spark plug caps with your hand. Never hit the spark plug caps with a tool.

Reinstall the air cleaner box and fuel tank in the reverse order of removal.

Air cleaner
The air cleaner element must be kept clean to provide good engine power and g1as mileage. If you use your motorcycle under normal low-stress conditions, you should service the air cleaner at the ...

Engine oil
Engine life depends on oil amount and quality. Daily oil level checks and periodic changes are two of the most important maintenance items to be performed. ...

Other materials:

Generator inspection
Generator coil resistance Remove the left side cowling. Refer to exterior parts removal and installation in section 9d .  Disconnect the generator coupler (1). Measure the resistance between the three lead wires. If the resistance is out of specified value, replace the ...

Rear brake caliper removal and installation
Removal Remove the rear wheel. Refer to rear wheel assembly removal and installation in section 2d .  Drain brake fluid. Refer to brake fluid replacement in section 4a .  Remove the brake hose from the caliper by removing the union bolt (1) and catch the brake fluid in a ...

Fail-safe function table
Fi system is provided with fail-safe function to allow the engine to start and the motorcycle to run in a minimum performance necessary even under malfunction condition. The engine can start and can run even if the signal in the table is not received from each sensor. But, the engine ...

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