Yamaha YZ450F Manuel D'atelier Du Proprietaire page 580

È
É
2
IGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the ignition coil from spark
2. Remove the ignition coil cap.
3. Connect the dynamic spark tester 1 (igni-
È For USA and CDN
É Except for USA and CDN
4. Kick the kick starter.
5. Check the ignition spark gap.
6. Start engine, and increase spark gap until
COUPLERS, LEADS AND IGNITION COIL
CONNECTION INSPECTION
1. Check:
EC625001
"ENGINE STOP" BUTTON INSPECTION
1. Inspect:
2 1
B B/W
1
No continuity while being pushed → Replace.
Continuity while being freed → Replace.
6 - 4
plug.
tion checker 2) as shown.
• Ignition coil 3
• Spark plug 4
misfire occurs. (for USA and CDN only)
Minimum spark gap:
6.0 mm (0.24 in)
• Couplers and leads connection
Rust/dust/looseness/short-circuit →
Repair or replace.
• Ignition coil and spark plug as they are fit-
ted
Push in the ignition coil until it closely
contacts the spark plug hole in the cylin-
der head cover.
• "ENGINE STOP" button conduct
Tester (+) lead → Black/White lead 1
Tester (–) lead → Black lead 2
B/W
1
PUSH IN
FREE
– +
ELEC
B Tester selec-
2
tor position
Ω × 1