Suzuki Intruder VZR1800 Service Manual page 32

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• Check spark plug heat range by observing electrode color. If

the electrode of the spark plug is wet appearing or dark color,

replace the spark plug with hotter type one. If it is white or

glazed appearing, replace the spark plug with colder type

"R" type spark plug has a resistor built into at the center elec-

trode to prevent radio noise.

CARBON DEPOSITS

• Check carbon deposits on the spark plug.

• If carbon is deposited, remove it using a spark plug cleaner

machine or carefully use a tool with a pointed end.

SPARK PLUG GAP

• Measure the spark plug gap with a thickness gauge.

• Adjust the spark plug gap if necessary.

% Spark plug gap A

Standard: 0.6 – 0.7 mm (0.024 – 0.028 in)

& 09900-20803: Thickness gauge

ELECTRODE'S CONDITION

• Check the condition of the electrode.

• If it is extremely worn or burnt, replace the spark plug.

Replace the spark plug if it has a broken insulator, damaged

thread, etc.

Confirm the thread size and reach when replacing the

plug. If the reach is too short, carbon will be deposited

on the screw portion of the plug hole and engine dam-

age may result.

PERIODIC MAINTENANCE 2-15

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