A new engine can cause
temporary spark plug fouling due to the preservative added during
the assembly process. Avoid prolonged
idle speeds, which cause plug fouling and carbonization.
Refer to the specifications
section for recommended spark plug type and gap.
| NOTICE |
| Using non-recommended spark plugs can result in serious engine damage.
Always use the spark plugs recommended for your snowmobile. |
Spark plug condition
is indicative of engine operation. The spark plug firing end condition
should be read after the engine
has been warmed up and the vehicle has been driven.
Immediately check the spark plug for correct color.
 WARNING |
| A hot exhaust system and engine can cause serious burns. Wear protective
gloves when removing a spark plug for inspection. |
Normal Plug
The normal insulator
tip is gray, tan or light brown. There will be few combustion deposits.
The electrodes are not burned
or eroded. This indicates the proper type and heat
range for the engine and the service.
| TIP |
| The tip should not be white. A white insulator tip indicates overheating,
caused by use of an improper spark plug or incorrect
carburetion adjustments. |
Wet Fouled Plug
The wet fouled
insulator tip is black. A damp oil film covers the firing end. There
may be a carbon layer over the entire
nose. Generally, the electrodes are not worn. General
causes of fouling are excessive oil, use of non-recommended oil, improper
use of the choke, or incorrect carburetion adjustments.
