Yamaha YZ450FW Manuel D'atelier Du Proprietaire page 584

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