Yamaha EF1000 Service Manual

IGNITION SYSTEM I ELEC 11-==::J I 
TROUBLESHOOTING CHART 
NO SPARK OR WEAK SPARK 
NOTE=------------------------------------------------------------
•Remove the following parts before troubleshooting. 
1) Spark plug 
• Use the following special tool(s) in this troubleshooting. 
Pocket tester: 
YU-03112(90890-03112) 
1. Spark plug 
•Check the spark plug condition. 
Refer to the SPARK  PLUG section in the 
CHAPTER 2. 
CORRECT 
2. Ignition spark gap 
•Disconnect the spark plug cap CD from 
spark plug....

* 
l 
3. Engine stop switch 
•Disconnect the engine stop switch  leads. 
•Connect the pocket  tester (Qx1) to the 
engine stop switch. 
•Do not push the engine stop switch; 
Check the engine stop switch for continu-
IGNITION  SYSTEM I ELEC I u I 
CONTINUITY 
ity. ·-----------
NO 
CONTINUITY 
•Push the engine stop switch: 
NO 
CONTINUITY 
Check the engine stop switch for continu-•••••••••• 
ity. 
CONTINUITY 
4. Ignition coil  resistance (Primary) 
•Remove the ignition coil. 
•Connect the pocket  tester as...

* 
l 
5. Ignition coil resistance  (Secondary) 
•Remove the ignition coil. 
•Connect the pocket  tester as shown. 
Ignition  coil resistance 
(Secondary): 
5.61 kQ±20% 
MEET 
SPECIFICATION 
6. C.D.I. coil  resistance  (Pulser) 
•Disconnect the C.D.I. coupler. 
•Connect  the pocket  tester 
as shown. 
ts*J C.D.I. coil resistance (Pulser): 
38Q±10% 
MEET 
SPECIFICATION 
7. C.D.I. coil resistance  (Charge) 
•Disconnect the C.D.I. coupler. 
•Connect  the pocket  tester 
as shown. 
~ C.D.I. coil resistance...

* 
! 
8. Oil level gauge 
• Drain the engine oil. 
Refer to the ENGINE  OIL section in 
CHAPTER 
2. 
• Remove  the oil level gauge. 
• Connect  the pocket  tester as shown. 
NO 
CONTINUITY 
•Overturn the oil  level gauge as shown. 
CONTINUITY 
•Tighten the oil level gauge bolts. 
~. 7 Nm (0.7 m • kg, 5.1 ft •lbl 
9. Wiring connecting 
• Check the entire ignition system for con-
IGNITION  SYSTEM I ELEC I I~ I 
CONTINUITY 
I Replace oil level gauge. 
NO  CONTINUITY 
I Replace oil level gauge. 
POOR...

GENERATOR SYSTEM I ELEC I u I 
TROUBLESHOOTING 
1. AC generation is not normal Check output voltage at AC 
Lr 
Check AC receptacle with its ter-
receptacle.  minals connected with a wire. 
0-15V Conducting I Faulty  voltmeter or faulty load.  Specified 
reading Not conducting Low reading 
~ Unusually 40-60V In-between 
~ 
high reading 
reading l Faulty AC receptacle 
Reset  governor 
arm/ shaft. 
I Check engine  revolutions. 
(i.e.  frequency) 
Turn  adjust 
bolt anticlockwise, r More  than 3,800 rpm....

GENERATOR SYSTEM I ELEC I u I 
2. DC generation is not normal. Check DC output voltage at DC 
_r 
Check  DC plug socket with its ter-
receptacle. minals connected with a  wire. 
I Approx. 5V I  I Not conducting Faulty pilot lamp.  Normal ov Conducting 
Faulty 
load. 
I Faulty receptacle I 
Make adjustment with adjust bolt, 1--Check engine  revolutions 
observing  engine revolutions.  (i.e. 
frequency). 
Stay  unchanged 
I Return to normal  (AC 
voltage indicated  on meter) Check  DC protector More than I...

(R x 1) 
2 
(R X 1) 
G 
G 
GENERATOR SYSTEM I ELEC I u I 
4-9 
INSPECTION 
Main coil resistance 
1. Disconnect the main coil coupler G). 
2. Connect the pocket tester as shown. 
Main coil resistance: 
1.7640±10% 
Out or specification~Replace stator assem­
bly. 
Sub  coil 
resistance 
1. Disconnect the sub coil coupler G). 
2. Connect the pocket tester as shown. 
Sub coil resistance: 
2.990±10% 
Out or specification~Replace stator assem­
bly.  

A 
8 
GENERATOR SYSTEM I ELEC I [~ I 
4-10 
Condenser functions 
1. Disconnect the condenser leads. 
2. Connect the pocket tester. 
Turn 
the pocket tester switch to Rx1 K 
from OFF position. 
Needle swings and returns back quickly-7 
Correct. 
Needle does not swing/return-7Replace. 
F!•41 ;] ~II~ (CJ 
Discharge the old condenser by shorting the 
two terminals together. 
Use  an 
Insulated screw driver. 
Do 
not touch either of the terminals and 
ground  before 
the condenser  is discharged. 
Rotor...

(R x 1) 
A 
B 
GENERATOTR SYSTEM I ELEC I u I 
4-11 
DC coil resistance 
1. Disconnect the DC coil coupler G). 
2. Connect the pocket tester as shown. 
DC coil resistance: 
0.4330±10% 
Out of specification~Replace stator assem­
bly. 
DC rectifier continuitys 
1. Remove the DC rectifier. 
2. Connect the pocket tester as shown. 
Continuity~Correct. 
No continuity~Replace DC rectifier. 
3. Connect the pocket tester as shown. 
No continuity~Correct. 
Continuity~Replace DC rectifier. 
~: Normal direction....

SPECIFICATIONS 
GENERAL SPECIFICATIONS 
MODEL CODE NUMBER 
DIMENSIONS 
Overall 
Length 
Overall Width 
Overall Height 
Dry Weight 
ENGINE 
Engine Type 
Cylinder Arrangement 
Displacement 
Bore x Stroke 
Compression Ratio 
Operating 
Hours 
Fuel 
Fuel  Tank  Capacity 
Engine 
Oil Capacity 
Engine 
Oil Grade 
IGNITION  SYSTEM 
Ignition Timing 
Spark Plug Type 
Gap 
GENERATOR 
AC Output 
Rated  Voltage 
Frequency 
Rated 
Output 
Rated Current 
Safety  Device Against 
DC Output 
Rated Voltage 
Rated 
Current...