Adjusting The Speed Limiter; Checking The Spark Plug - Yamaha YFM70RY Service Manual

d
c
6
4
EWA1S3L001
WARNING
After adjusting the throttle lever free play,
start the engine and turn the handlebar to the
right or left to ensure that this does not
cause the engine idling speed to change.
L LLL L LLL L L LLL L
EAS29170

ADJUSTING THE SPEED LIMITER

The speed limiter keeps the throttle from becom-
ing fully-opened even when the throttle lever is
applied to the maximum position. Screwing in
the adjusting screw stops the engine speed from
increasing.
1. Measure:
• Speed limiter length "a"
Out of specification → Adjust.
Speed limiter length
Less than 12 mm (0.47 in)
2. Adjust:
• Speed limiter length "a"
M MMM M MMM M M MMM M
a. Loosen the locknut "1".
b. Turn the adjuster "2" clockwise or counter-
clockwise until the specified speed limiter
length is obtained.
Clockwise
Speed limiter length is decreased.
Counterclockwise
Speed limiter length is increased.
5
L LLL L L LLL L L LLL L
M MMM M M MMM M M MMM M
c. Tighten the locknut.
EWA14880
WARNING
• Particularly for a beginner rider, the speed
limiter should be screwed in completely.
Screw it out little by little as their riding
technique improves. Never remove the
LLL
speed limiter for a beginning rider.
• For proper throttle lever operation, do not
turn out the adjuster more than the speci-
fied length. Also, always adjust the throttle
cable free play to within specification.
L LLL L LLL L
EAS20690

CHECKING THE SPARK PLUG

1. Disconnect:
• Spark plug cap
2. Remove:
• Spark plug
ECA13330
NOTICE
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
into the cylinder.
3. Check:
• Spark plug type
Incorrect → Change.
4. Check:
MMM
• Electrode "1"
Damage/wear → Replace the spark plug.
• Insulator "2"
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
3-8
L LLL L L LLL L L LLL L
Manufacturer/model
NGK/CR8E
ENGINE
L LLL L LLL