Download Print this page

YAMAHA YZ250F(Y) Owner's Service Manual Page 173

Hide thumbs

Advertisement

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)
Minimum spark gap:
6.0 mm (0.24 in)
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
Tester (+) lead→Black/White lead
"1"
Tester (-) lead → Black lead "2"
Result
Conductive (while the
engine stop switch is
pushed)
Not conductive while it is pushed →
Replace.
Conductive while it is freed → Re-
place.
Set the tester selection position to "Ω
× 1".
CHECKING THE IGNITION COIL
1. Remove the ignition coil cap.
2. Inspect:
• Primary coil resistance
Out of specification → Replace.
Tester (+) lead → Orange lead "1"
Tester (-) lead → Black lead "2"
Primary
Tester se-
coil resis-
lector posi-
tance
0.08–0.10
Ω at 20 °C
(68 °F)
3. Inspect:
• Secondary coil resistance
Out of specification → Replace.
Tester (+) lead → Orange lead "1"
Tester (-) lead → Spark plug termi-
nal "2"
Secondary
Tester se-
coil resis-
lector posi-
tance
4.6–6.8
kΩat 20 °C
(68 °F)
6-4
IGNITION SYSTEM
4. Inspect:
• Sealed portion of ignition coil "a"
• Spark plug terminal pin "b"
• Threaded portion of spark plug "c"
Wear → Replace.
CHECKING THE CDI MAGNETO
1. Inspect:
• Pickup coil resistance
Out of specification → Replace.
Tester (+) lead → Red lead "1"
Tester (-) lead → White lead "2"
tion
Ω × 1
2. Inspect:
• Charging coil 1 resistance
Out of specification → Replace.
Tester (+) lead → Brown lead "1"
Tester (-) lead → Green lead "2"
tion
kΩ × 1
Tester se-
Pickup coil
lector posi-
resistance
tion
248-372 Ω
at 20 °C (68
Ω ×100
°F)
Charging
Tester se-
coil 1 resis-
lector posi-
tance
tion
720-1,080
Ω at 20 °C
Ω ×100
(68 °F)

Advertisement

This manual also for:

Yz250f 2009, Yz250fy 2009

Comments to this Manuals

Symbols: 0
Latest comments:
  • Dave May 30, 2016 02:21:
    Really good really good really goodj