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The recommended standard spark plug will work very well in most riding condition. However, if you plan
on riding for extended periods of time at high speed or high engine rpm in hot climates, or plan extended
riding in cold climates, a different plug may be recommended.
A fouled (dirty) spark plug can cause your motorcycle to run poorly and lose performance. Follow the steps
below to inspect, clean and/or replace the spark plug if needed.
1.Clean any dust and dirt from around the spark plug base.
2. Disconnect the spark plug cap.
3. Remove the spark plug.
4. Using the photos below for reference, examine the plug to determine its cleanliness. If the plug is a
normal color, go on to step 6. If the plug is fouled (dirty), go to step 5.
5. Using moderate grit sandpaper (220-400), sand between the center electrode and the side electrode until
all carbon and oil deposits are removed. Xmotos recommends that you use a spark plug cleaner or a new
spark plug if the plug is very dirty.
6. Inspect the spark plug electrodes for wear. The center electrode should have square edges. The side
electrode should not be eroded at all. The insulator should not be cracked or chipped. Replace the plug if
any electrode wear and/or cracks are present.
7. Check the spark plug gap using a spark plug gaper. Gapers can be purchased at your local auto parts store.
The spark plug gap should be . 0.5 - 0.8mm. Always check the gap of anew spark plug before you install it.
8. Be sure all dirt has been cleaned from the threads. Install the spark plug by hand. This will prevent
stripping and/or cross threading of the threads. Use a5/8 in socket or wrench to securely tighten the spark
plug. Do not over or under tighten the spark plug.
When you inspect the spark plug, generally it will fit into one of the four categories shown above. A normal/clean
spark plug will have a light brown center and displays no wear around the electrodes. A sparkplug with a bright white
center indicates a lean condition in the engine. If your plug looks like this, have your motorcycle serviced by your
Xmotos dealer immediately. A carbon fouled plug will be completely black with no gloss. An oil fouled plug will
appear a dark shiny brown or shiny black as shown above. An oil fouled plug is caused when the engine oil seeps by
the piston ring and is burned with the fuel. Oil fouled plugs are not uncommon, however, if your motorcycle is
consistently oil fouling spark plugs, have it serviced by your local Xmotos dealer immediately.
Using a spark plug with an improper heat range or
incorrect reach, can cause engine damage. Using a
non-resistor spark plug may cause ignition problems.
NOTICE
An improperly tightened spark plug can damage the
engine. If a plug is too loose, a piston may be damaged.
If a plug is too tight, the threads may be damaged.
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NOTICE
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