Yamaha 2011 WR450FA, Owner'S Service Manual

Page: 212 / 230

7-4
IGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the ignition coil from
spark plug.
2. Remove the ignition coil cap.
3. Connect the dynamic spark tester
"1" (ignition checker "2") as
shown.
• Ignition coil "3"
• Spark plug "4"
A. For USA and CDN
B. Except for USA and CDN
4. Kick the kickstarter crank.
5. Check the ignition spark gap.
6. Start engine, and increase spark
gap until misfire occurs. (for USA
and CDN only)
CHECKING THE COUPLERS,
LEADS AND IGNITION COIL
CONNECTION
1. Check:
• Couplers and leads connection
Rust/dust/looseness/short-circuit
→
Repair or replace.
• Ignition coil and spark plug as
they are fitted
Push in the ignition coil until it
closely contacts the spark plug
hole in the cylinder head cover.
CHECKING THE ENGINE STOP
SWITCH
1. Inspect:
• Engine stop switch conduction
Not conductive while it is pushed
→
Replace.
Conductive while it is freed
→ Re-
place.
Set the tester selection position to "
Ω
× 1".
2. Inspect:
• Rubber part "a"
Tears/damage
→
Replace.
CHECKING THE MAIN SWITCH
1. Inspect:
• Main switch conduction
Not conductive while the main switch
is moved to "ON"
→
Replace.
Conductive while the main switch is
moved to "OFF"
→
Replace.
Set the tester selection position to "
Ω
×1".
2. Inspect:
• Main switch indicator light
Use 12 V battery.
Indicator light does not come on
→
Replace.
3. Inspect:
• Rubber part "a"
Tears/damage
→
Replace.
CHECKING THE IGNITION COIL
1. Remove the ignition coil cap.
2. Inspect:
• Primary coil resistance
Out of specification
→
Replace.
Minimum spark gap:
6.0 mm (0.24 in)
Tester (+) lead
→
Black lead "1"
Tester (-) lead → Black lead "2"
Result
Conductive (while the
engine stop switch is
pushed)
Tester (+) lead
→
Red lead "1"
Tester (-) lead
→
Brown lead "2"
Result
Conductive (while the
main switch is moved
to "ON")
Battery (+) lead
→
Red/Black lead
"1"
Battery (-) lead
→
Black lead "2"
Tester (+) lead
→
Orange lead "1"
Tester (-) lead
→
Black lead "2"
Primary
coil resis-
tance
Tester se-
lector posi-
tion
0.08–0.10
Ω
at 20 °C
(68 °F)
Ω
× 1