Yamaha Motor YZ250F 2005 Manuel D'atelier Du Proprietaire page 606

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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 kickstarter crank.
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-
ENGINE STOP SWITCH INSPECTION
1. Inspect:
• Engine stop switch conduct
Tester (+) lead → Black/White lead 1
Tester (–) lead → Black lead 2
2
1
B
B/W
No continuous while being pushed → Replace.
Continuous 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

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Yz250fv 2005

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