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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 with an Autolite 255 spark plug or equivalent if any electrode wear and/or cracks
are present.
7. Check the spark plug gap using a spark plug gapper. Gappers can be purchased at your local auto
parts store. The spark plug gap should be .03in (0.7mm). Always check the gap of a new
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 a 19mm
socket or wrench to securely tighten the spark plug. Do not over or under tighten the spark plug.
Improperly tightened spark plugs can damage the engine. Too loose, you can burn a
hole in the piston. Too tight, you can damage the threads of the engine.
Basic Maintenance Procedures
Spark Plug Maintenance
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 spark plug with a bright
white center indicates a lean condition in the engine. If your plug looks like this, have your go-kart serviced by your
Authorized Monster Moto Service Center 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 go-kart is consistently oil fouling spark plugs, have it serviced by your Authorized Service Center immediately.
Insulator
Threads
Spark Plug
Gap
Center Electrode
Side Electrode
CAUTION
!
Normal Spark Plug
(light brown center)
Lean Spark Plug
(white center)
Fouled Spark Plug
(heavy carbon buildup)
Fouled Spark Plug
(heavy oil buildup)
A fouled (dirty) spark plug can cause your go-kart 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 using a 19mm socket or
wrench.
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 a moderate grit sandpaper (220-400), sand
between the center electrode and the side electrode
until all carbon and oil deposits are removed.
If the plug is very dirty, use a spark plug cleaner or move
on to Step 6 to replace your spark plug.
