15. IGNITION SYSTEM
15-0
MX’er 50
15
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IGNITION SYSTEM
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SERVICE INFORMATION -------------------------------------------- 15- 2
TROUBLESHOOTING ------------------------------------------------- 15- 3
IGNITION COIL -------------------------------------------------------- 15- 4
A.C.GENGRATOR ------------------------------------------------------ 15- 5
CDI UNIT INSPECTION----------------------------------------------- 15- 6
15
15. IGNITION SYSTEM
15-1
MX’er 50
IGNITION CIRCUIT
Ignition Switch
CDI Unit
ntrol
A.C. Generator/ Pulser Coil
Spark Plug
Ignition Coil
15. IGNITION SYSTEM
15-2
MX’er 50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• Check the ignition system according to the sequence specified in the Troubleshooting.
• The ignition system adopts CDI unit , change gear control and the ignition timing cannot be
adjusted.
• If the timing is incorrect, inspect the CDI unit, A.C. generator, change gear control and replace
any faulty parts. Inspect the CDI unit with a CDI tester
• Loose connector and poor wire connection are the main causes of faulty ignition system. Check
each connector before operation.
• Use of spark plug with improper heat range is the main cause of poor engine performance.
• The inspections in this section are focused on maximum voltage. The inspection of ignition coil
resistance is also described in this section.
• Inspect the ignition switch according to the continuity table specified in page 17-5.
• Inspect the spark plug referring to Section 3.
SPECIFICATIONS
Item
Standard
Standard type
BR8HAS
Spark plug
Hot type
Cold type
Spark plug gap
0.6_ 0.7mm
Ignition timing
“F” mark
Full advance
22ºBTDC/2000±100rpm
Primary coil
0.2_ 0.3W
Ignition coil resistance (20¢J)
Secondary
with plug cap
8.0_ 9.3KW
coil
without plug cap
3.0_ 4.2KW
Pulser coil resistance (20¢J)
50_ 200W
Exciter coil resistance (20¢J)
400_ 700W
15. IGNITION SYSTEM
15-3
MX’er 50
TROUBLESHOOTING
High voltage too low No high voltage
• Weak battery or low engine speed • Faulty ignition switch
• Loose ignition system connection • Faulty CDI unit
• Faulty CDI unit • Poorly connected or broken CDI ground wire
• Faulty ignition coil •Dead battery or faulty regulator/rectifier
• Faulty pulser coil • Faulty ignition coil connector
Normal high voltage but no spark at plug • Faulty pulser coil
• Faulty spark plug
• Electric leakage in ignition secondary circuit
• Faulty ignition coil
Good spark at plug but engine won‘t start
• Faulty CDI or incorrect ignition timing
• Faulty change gear control unit
• Improperly tightened A.C. generator flywheel
15. IGNITION SYSTEM
15-4
MX’er 50
IGNITION COIL INSPECTION
Continuity Test
Measure the resistance between the ignition
coil primary coil terminals.
Resistance (20¢J): 0.2_ 0.3W
Measure the secondary coil resistance
between the spark plug cap and the primary
coil terminal as Figure A shown.
Resistance (20¢J) (with plug cap):
8.0_ 9.3KW
Measure the secondary coil resistance
between the ignition coil terminal and the
primary coil terminal as Figure B shown.
Resistance (20¢J) (without plug cap):
3.0_ 4.2KW
This test is to inspect the continuity of
ignition coil.
°Ø
Figure A
Figure B
Ignition Coil
Green
Black
15. IGNITION SYSTEM
15-5
MX’er 50
Performance Test
Remove the ignition coil.
Inspect the ignition coil with an ignition coil
tester.
1. Turn the changeover switch to 12V and
connect the ignition coil to the tester.
2. Turn the power switch ON and check the
spark from the watch window.
_Good : Normal and continuous spark
_Faulty : Weak or intermittent spark
A.C. GENERATOR
Exciter Coil/Pulser Coil Inspection
Disconnect the A.C. generator wire
connector.
Measure the exciter coil resistance between
the black/red wire and ground.
Resistance (20¢J): 400_ 700W
Measure the pulser coil resistance between
the blue/yellow wire and ground.
Resistance (20¢J): 50_ 200W
Ignition Coil
Blue/Yellow
This test is performed with the stator
installed in the engine.
°Ø
Follow the ignition coil tester manufacturer‘s instructions.
°Ø
The test is performed at both conditions
that the ignition coil is cold and hot.
°Ø
Ignition Coil
CDI Unit
Spark Plug
CDI Tester
15. IGNITION SYSTEM
15-6
MX’er 50
CDI UNIT INSPECTION
Remove the seat and battery cover.
Disconnect the CDI coupler and remove the
CDI unit.
CDI CIRCUIT INSPECTION
Measure the resistance between the
terminals.
Replace the CDI unit if the readings are not
within the specifications in the table below.
Use the x KW range for the Sanwa Tester.
Use the x 100W range for the Kowa Tester.
Unit: KW
Probe⊕
(-)Probe
Black/
Yellow
Black/
Red
Black/
White
Blue/
Yellow
Green
Black/
Yellow
°¤°¤°¤
°¤
Black/
Red
°¤
4-6°¤°¤
Black/
White
°¤°¤°¤
°¤
Blue/
Yellow
°¤
25-45
80-100
15-25
Green
°¤
4-6
10-20
°¤
• Due to the semiconductor in circuit, it is
necessary to use a specified tester for
accurate testing. Use of an improper
tester in an improper range may give
false readings.
• Use a Sanwa Electric Tester or Kowa
Electric Tester (TH-5H).
• In this table, “Needle swings then
returns” indicates that there is a charging
current ap plied to a condenser. The needle
will then remain at “°¤ ” unless the
condenser is discharged.
°Ø
CDI Unit
Blue/ Yellow
Green
Black/ Yellow
Black/ Red
Coupler
Black/ White
Ignition Coil
CDI Unit
Spark Plug
CDI Tester
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