Yamaha EF1000A Service Manual

MAINTENANCE SPECIFICATIONS I SPEC I g­
MAINTENANCE SPECIFICATIONS 
ENGINE 
Item Standard Limit 
Piston: 
~~(in) Piston clearance 0.020-0.035 (0.00078-0.00137) 
Piston  size D 49.974-49.994  (1.967-1.968)  49.974 
(1.967) 
Measuring point H 10.0 (0.3937) D 
Piston pin: mm (in) 
Piston  pin 
diameter 11.996-12.000 (0.4723-0.4724)  11.95 (0.470) 
Piston 
ring: mm (in) 
Top 
ring Barrel 
~ 
End gap 0.1-0.25 (0.004-0.01)  0.9 
(0.035) 
Side clearance 0.06  (0.002) 0.15 (0.0059) 
2nd ring Plane 
~ 
End gap...

MAINTENANCE SPECIFICATIONS I SPEC I g-
Item 
Connecting rod: 
Small end diameter A 
Oil clearance 
Big  end  diameter B 
Oil clearance 
Limit 
Camshaft: 
Camshaft  outside 
diameter 
Cam dimension 
A 
B 
Camshaft journal 
Limit 
Valve: 
Valve 
dimension 
mm (in) 
mm (in) 
QJ· 
B 
mm (in) 
c 
/~ 
Head  diameter A ~~'I : ~ 
Stem  diameter B 
Length C 
Seat width D 
Valve seat bend limit 
8 
Valve guide 
IN 
EX 
IN 
EX 
IN 
EX 
Guide  inside diameter IN 
EX 
Stem to guide clearance  IN 
EX 
Valve...

MAINTENANCE SPECIFICATIONS I SPEC I g-
ELECTRICAL 
Item Standard Limit 
GENERATOR: 
Type  Brush-less, self-exciting, 
single-phase, 
A.C. generator 
Number of poles 2 
Excitation 
Self magnetization 
Initial excitation  Residual magnetization 
Driving 
method Direct  connection 
Rated 
power factor 1.0 
Frequency fluctuation Less than 5% 
Voltage v 120 
Frequency Hz 60 
Coil 
resistance 
Main coil  Q±10% 1.45 
Sub coil 
Q±10% 3.45 
Rotor 
coil  Q±10% 8.05 
ELECTRICAL: 
Ignition system: 
Type/I.D....

TIGHTENING TORQUE/ 
---------G-EN_E_R_A_L_T_o_R_a_u_E_s_~_c_IF_~_A_T-IO_N_S_/_ISPECI~ DEFINITION OF UNITS _ . W 
TIGHTENING TORQUE 
Thread size  Torque Nm (m•kg, 
ft•lb) Remarks 
Spark plug 
Cylinder  head cover 
Cylinder head 
Crankcase  cover 
Connecting  rod 
Rotor 
Governor arm 
Valve  clearance  adjusting 
nut 
Fly wheel 
Coil assembly 
Fuel  tank 
Muffler 
Carburetor 
Muffler protector 
Front flame 
Rear flame 
Recoil  starter 
GENERAL TORQUE 
SPECIFICATIONS 
M14x 1.25 
M 
6x 1.0 
M 6x 1.0 
M 6x...

CABLE, HOSE ROUTING 
CABLE,  HOSE ROUTING I SPEC I go-
CD 
5-6 
[A] control box panel 
[ID Behind control box 
[Q] Behind control box panel 
CD A.C.protector 
@A. C. receptacle 
®Ground (Earth terminal) 
@Engine switch 
J  

___________________ c_A_BL_E_,_H_o_sE __ Ro_u_T_I_N_G_IsPECI ~ 
G) Carburetor 

G) Fuel tank 
~ Fuelcock 
@Air filter 
@ Carburetor 
@Rear frame 
®Fuel hose 
[AJ Pass the fuel hose through on 
the crankcase to under the 
carburetor. 
CABLE, HOSE ROUTING I SPEC I rr-1 
5-8  

CD Air shroud under 
@Crankcase 
@Plate 
@Flywheel 
® Coil assembly 
@ Oil level switch 
Q) Clamp 
@ Oil level switch lead 
®Coil assembly  lead 
CABLE, HOSE ROUTING I SPEC I g-1 
rn:J Pass the coil assembly  lead to 
the crankcase  and plate. 
[Q] Clamp with the oil level switch 
lead and  wireharness. 
[AJ Set in to the oil level switch lead 
to the slit of the crankcase. 
5-9