Tune-Up Information

General Specs    Maintenance Intervals
Fluids and Lubricants

General Specs

Item Standard
Spark Plug
(NGK)
Plug
installation
 Torque
Spark Plug
Gap
Ignition
Timing
Point/Air
 Gap
Carburetor
Air Screw
(Turns out))
Idle Speed Float Level Compression
See 5 below
Transmission
Oil Capacity
Tire Pressure
(Original Tires)
S1, A-C
('72-'75)
KH250
('74-'79)
B9HCS 18-22
ft. lbs.
.024-.028 in.
.6-.7 mm
.102 in.
2.60 mm
23 deg.
BTDC
.012-
.016 in.
.3-.4 mm
1 1/2 (S1)
1 1/4
(A-C, KH250)
1300-1500 RPM .99 in.
25 mm (S1)
1.00 in.
25.5 mm
(A-C, KH250)
142 PSI 1.16 qt. 24 PSI (Front)
31 PSI (Rear)
S2,A
('72-'73)
S3,A
('74-'75)
B9HCS
(S2)
B8HCS
(S3)
18-22
ft. lbs.
.024-.028 in.
.6-.7 mm
.102 in.
2.60 mm
23 deg.
BTDC
.012-
.016 in.
.3-.4mm
 
1 1/2 1300-1500 RPM 1.00 in.
25.5 mm
150 PSI 1.16 qt. 24 PSI (Front)
31 PSI (Rear)
KH400
('76-'80)
B8HCS 18-22
ft. lbs.
.035-.039 in.
.9-1.0 mm
.102 in.
2.60 mm
23 deg.
BTDC
016-
.020 in.
.4-.5mm
 
1 1/4 1200-1300
RPM
1.00 in.
25.5 mm
150 PSI 1.16 qt. 24 PSI (Front)
31 PSI (Rear)
H1,A
('69-'71)
(Distributor CDI)
BUHX
(Surface Gap)
18-22
ft. lbs.
See 1 Below .136 in.
3.45 mm
25 deg.
BTDC
016-
.024 in.
.4-.6mm
 
1 1/4 1150-1250
RPM
.94 in.
24.0 mm
See 4 Below
142 PSI 1.7 qt. 26 PSI (Front)
31 PSI (Rear)
H1B
('72)
(points ignition)
B9HCS 18-22
ft. lbs.
.016-.020 in.
.4-.5 mm
.088 in.
2.23 mm
 20 deg. BTDC
.012-
.016 in.
.3-.4mm
 
1 1/2 1150-1250
RPM
.94 in.
24.0 mm
See 4 Below
142 PSI 1.3 qt. 25 PSI (Front)
28 PSI (Rear)
H1C
('72)
(Distributor CDI)
B9HCS 18-22
ft. lbs.
See 1 Below .136 in.
3.45 mm
25 deg.
BTDC
016-
.024 in.
.4-.6mm
1 1/4 1150-1250
RPM
.94 in.
24.0 mm
See 4 Below
142 PSI 1.7 qt. 25 PSI (Front)
28 PSI (Rear)
H1D,E,F
('73-'75)
KH500
('76)
B9HS-10 18-22
ft. lbs.
.035-.039 in.
.9-1.0 mm
.116 in.
2.94 mm
23 deg.
BTDC
020-
.030 in.
.5-.8mm
1 1/4 1150-1250
RPM
.94 in.
24.0 mm
See 4 Below
142 PSI 1.3 qt. 26 PSI (Front)
31 PSI (Rear)
H2,A-C
('72-'75
B9HS-10 18-22
ft. lbs.
.035-.039 in.
.9-1.0 mm
.123 in.
3.13 mm
23 deg.
BTDC
020-
.030 in.
.5-.8mm
1 1/2 (H2,A)
1 3/4 (B,C)
1150-1250
RPM
.94 in.
24.0 mm
See 4 Below
142 PSI 1.5 qt. 26 PSI (Front)
31 PSI (Rear)

1 No gap for BUHX, all others use .035-.039 in., .9-1.0 mm
3 Below edge of carburetor body, .16-.24 in., 4-6 mm

4 Below edge of carburetor body, .08-.16 in., 2-4 mm

5 within 45 PSI overall, or less than 15 PSI between cylinders

Timing Reference

500:
20 degrees..2.234mm (.088")
21..............2.458mm (.097")
22..............2.694mm (.106")
23..............2.939mm (.116")
24..............3.194mm (.126")
25..............3.459mm (.136")
26..............3.733mm (.147")

750:
20.............2.384mm (.094")
21.............2.642mm (.103")
22.............2.875mm (.113")
23.............3.137mm (.124")
24.............3.409mm (.134")
25.............3.692mm (.145")
26.............3.985mm (.157")

 

Maintenance Intervals
Check the following every. . .

Day Week Month 200 Miles 2000 Miles 4000 Miles 8000 Miles
Brakes Transmission Oil Level Charge Battery
(If In Storage)
Lubricate Chain Change Transmission Oil Change Fork Oil Replace hydraulic brake fluid
Lights Cold Tire Pressure     Remove, clean, and lubricate chain Grease wheel and steering head bearings  
Horn Spoke Tension     Lubricate cables Check brake pads  
Tires Battery Electrolyte Level     Check oil pump adjustment Check sprockets  
Chain Tension Chain Condition     Clean fuel petcock Grease speedometer drive  
Cable Adjustments Critical Nuts and Bolts     Check brake fluid level (If disc brake)
Adjust brakes
Clean carburetors  
Oil Tank Level       Clean and gap spark plugs Replace Spark Plugs  
        Clean points
(
If breaker point)
   
        Check Timing    
        Clean or Replace Air Filter    
        Clean carbon off exhausts and top end    

Fluids and Lubricants

Gasoline Injector Oil Transmission Oil Fork Oil Chain Oil Cables Swingarm bushings and Steering head
Premium
(92 octane) unleaded
Synthetic/Semi- Syn SAE 10W-30 SAE 10W Any high quality chain oil. Light motor oil Lithium or Moly based bearing grease
Standard (87-89 octane) Mineral SAE 10W-40 SAE 20W   Graphite based lubricant Chassis Grease
    SAE 30 (Summer) 10W-40 for
heavy damping
  Molybdenum Disulfide based Lubricant  
    SAE 20 (Winter)        
    85W90 gear oil w/o molybdenum disulphide        

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