Spark Plug; Plug Gap - Joyner JNSZ650DL Owner's Manual

New and used coolant can be hazardous.
Children and pets may be harmed by new or used coolant.
Continuous or brief contact with coolant may be dangerous for your health.
Keep new and used coolant away from the children and pets. To minimize your
exposure to new and used coolant, wear a long sleeve shirt and moisture-proof
gloves(such as dishwashing gloves) when you change coolant. If coolant contacts
your skin, wash thoroughly with soap and water. Wash any clothing or rags if wet
with coolant. Recycle or properly dispose of used coolant.
Failure to use the correct coolant or coolant not the same as one in the radiator
or reserve case can harm your ATV. Engine damage may occur if you use coolant
that does not meet the specifications.
E. Spark Plug
a. Remove the spark plug and inspect it
each time you change the oil.
(Use a spark plug wrench) The electrodes
should be kept clean and free of carbon.
The presence of carbon or excess oil will
greatly reduce proper engine performance.
If possible, check the spark plug gap
(area between electrodes) using a wire feeler
gauge. This specification is 0.025"~0.030".
b. Before installing spark plug coat threads
lightly with graphite grease if possible,
to ensure easy removal next time the spark plug
needs inspection (see Fig. 18).
c. It is advisable to replace the spark plug at least once a year to insure easy starting
and good engine performance.
SERVICE INSTRUCTIONS
F. Carburetor Adjustment
Never make unnecessary adjustments. The factory recommended settings are correct for most
Figure 18
24