2-8
ATV-0051
Adjust the gap to 0.7-0.8 mm (0.028-0.032 in.).
ATV0052B
When installing the spark plug, be sure to tighten it
securely. A new spark plug should be tightened 1/2
turn once the washer contacts the cylinder head. A
used spark plug should be tightened 1/8-1/4 turn
once the washer contacts the cylinder head.
Muffler/Spark Arrester
The muffler has a spark arrester which must be peri-
odically cleaned. At the intervals shown in the Peri-
odic Maintenance Chart, clean the spark arrester
using the following procedure.
1. Remove the three cap screws securing the spark
arrester screen assembly to the muffler; then
loosen and remove the spark arrester. Account
for a gasket.
CF105A
CF104
2. Using a suitable brush, clean the carbon deposits
from the screen taking care not to damage the
screen.
NOTE: If the screen or gasket is damaged in any
way, it must be replaced.
3. Install the spark arrester assembly and gasket
and secure with the three cap screws. Tighten
the cap screws to 0.6 kg-m (4.0 ft-lb).
Gas/Vent Hoses
Replace the gas hose every two years. Damage from
aging may not always be visible. Do not bend or
obstruct the routing of the carburetor vent hose. Make
certain that the vent hose is securely connected to the
carburetor and the opposite end is always open.
Adjusting Engine RPM
(Idle)
To properly adjust the idle RPM, a tachometer is
necessary. To adjust idle RPM, use the following
procedure.
! CAUTION
Before removing the spark plug, be sure to clean the
area around the spark plug. Dirt could enter engine
when removing or installing the spark plug.
! WARNING
Wait until the muffler cools to avoid burns.
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