Yamaha EF1000A Service Manual

SPECIAL TOOLS 
SPECIAL  TOOLS 
GEN 
INFO 
The following special tools are necessary for complete and accurate tune-up and assembly. Use 
only the appropriate special tools; this will help prevent damage caused by the use of 
inappropriate tools or improvised techniques. 
When placing an order, refer to the list provided below to avoid any mistakes. 
Tool No. 
YU-33294 
(90890-05158) 
YU-1047 
YU-03016  (90890-03016) 
YU-26900-9  (90890-03079) 
YU-33223 
(90890-03081) 
YU-33223-3 
(90890-04082) 
YU-03112...

INTRODUCTION/MAINTENANCE INTERVALS CHART/ 
PERIODIC MAINTENANCE/LUBRICATION  INTERVALS 
PERIODIC INSPECTIONS AND ADJUSTMENTS 
INTRODUCTION 
This chapter includes  all information necessary to perform recommended  inspections and adjust­
ments.  These preventive  maintenance  procedures, 
if followed, will ensure more reliable machine 
operation  and a 
longer service life. The  need for costly  overhaul work will be greatly reduced.  This 
information applies to machines already in service as well as new...

PERIODIC MAINTENANCE/LUBRICATION  INTERVALS 
Pre-O~era-Initial Every 
No. 
Item Remarks tion c  eck 
1 month 3 months 6 months 12months (daily) or 20 hr or 50 hr or 100 hr or 300 hr 
** Check  recoil starter • 12. Starting  system 
operation. 
** More frequency if 13. Decarbonizatior • necessary. 
14. Fittings/fasteners Check all fittings and 
fastners.  Correct if • necessary. 
2-2  

ENGINE OIL 1•:gs 1 Q 1 
------------------------------------------------
700..()65 
-CD 
2-3 
ENGINE 
ENGINE  OIL 
Recommended oil: 
lA] VAMALUBE 4 (10W-30) or 
SAE 
10W-30 type SE 
[ID SAE #30 
[QI SAE #20 
[Q] SAE 10W 
Engine oil quantity: 
0.43 L (0.38 Imp qt, 0.45 US  qt) 
NOTE:------------------------
Recommended  engine oil classification: 
API 
Service SE or SF, if not available, 
SD. 
Oil  level inspection 
1. Check: 
•Oil level 
Oil level adjustment  steps: 
• Place the engine on a flat surface....

1•:gs1d1 FUEL LINE INSPECTION/FUEL  PETCOCK/AIR FILTER _ . ~ _ 
+ 
:-..· : ..... 
2 
2-4 
4. Fill: 
•Engine oil 
Recommended  engine oil: 
0.43 
L (0,38 Imp qt, 0.45  US qt) 
Do not allow foreign material to enter the· 
crankcase. 
5. Install: 
•Oil filler cap 
FUEL LINE  INSPECTION 
1. Inspect: 
•Fuel hose G) 
•Fuel petcock ® 
Clacks/damage---+Replace. 
Poor connection---+Correct. 
FUEL PETCOCK 
Removal 
and inspection 
1. Turn the fuel petcock lever the C 
position. 
2. Inspect: 
•Fuel petcock  cup G)...

IIANDSJP I ~ I AIR FILTER/MUFFLER ~ 
-------------------------------------------------------
• 
2-5 
2. Inspect: 
•Element 
Clogging~Wash the element in a 
solvent and dry it. 
Oil the element and squeeze out the 
excess oil. 
Damge~Rplace . 
• ~ Recommended oil: 
 U Form-air-filter oil or 
SAE #20 motor oil 
3. Inspect: 
•Air filter element 
•Air filter cover 
NOTE=--------------------------------------------------
Do not wiring out the element; this could 
cause it to tear. 
The engine should never be...

IIANDSJP I ~ I VALVE CLEARANCE ADJUSTMENT ~ 
-------------------------------------------------------
2-6 
VALVE CLEARANCE ADJUSTMENT 
NOTE=--------------------------
Valve clearance must be measured when the 
engine  is cool to touch. 
1. Remove: 
•Fuel tank 
•Breather hose CD 
•Air shroud (under)@ 
•Air shroud (upper)@ 
•Cylinder head cover@ 
•Spark plug @ 
2. Pull the starter rope until the piston 
touches the screwdriver. the piston is 
then  at 
TDC. 
3. Inspect: 
•Valve  clearance 
Out of...

VALVE CLEARANCE ADJUSTMENT/ l•:gs 1 ** 1 COMPRESSION  PRESSURE MEASUREMENT _ . ~ _ 
2-7 
5. Install: 
•Cylinder head cover gasket 
•Cylinder head cover CD 
•Air shroud (upper) ® 
•Air shroud (under)@ 
•Breather hose@ 
•Spark plug@ 
6. lighten: 
•Cylinder head cover 
1~19 Nm (0.9 m•kg, 6.5 ft•lb) I 
COMPRESSION  PRESSURE MEASUREMENT 
Insufficient compression pressure will result 
in performance loss and may indicate leaking 
valves 
or worm or damage piston  rings. 
1. Measure: 
•Valve clearance 
2. Warm...

CYLINDER HEAD DECARBONIZATION/ l•:gs 1 d 1 GOVERNOR ADJUSTMENT _ . ~ _ 
2-8 
Compression test steps (below minimum 
levels): • 
Squirt a few drops of oil into the 
cylinder. 
• 
Measure the compression  again 
Reading  Diagnosis 
If higher than • Worn cylinder, 
without oil piston and 
piston ring. 
If the same as • Defective piston, 
without oil ring(s), valve(s) 
and cylinder 
head gasket. 
• Improper valve 
timing and valve 
clearance. 
Compression test steps (above maximum 
levels): 
• 
Check the...

ENGINE SPEED ADJUSTMENT/ l•:gr 1 ~ 1 BREATHER HOSE INSPECTION/SPARK PLUG _ . ~ _ 
2-9 
ENGINE SPEED ADJUSTMENT 
1. Adjust: 
•Engine speed  (with no load) 
Engine  speed 
adjustment steps: 
1. Install the Tachometer  . 
2. Start the engine and let it warmup for a 
few minutes. 
3. Adjust the engine speed by turning the 
throttle stop screw CD in or out. 
Engine speed (with no load): 
60Hz 3,700-3,850 rpm 
Inductive tachometer: 
VU-8036-A (90890-03113) 
BREATHER HOSE INSPECTION 
1. Inspect: 
•Breather hose...