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Engine Specifications

GENERAL SPECIFICATIONS

Year Displ. Carburetor HP at RPM Torque (Ft. Lbs. at RPM) Compr. Ratio Bore Stroke
cu. ins. cc in. mm in. mm
1978 75.48 1237 2-Bbl. .... .... 8.1:1 2.83 72 2.99 76
VALVES

Engine & Valve Head Diam. In. (mm) Face Angle Seat Angle Seat Width In. (mm) Stem Diameter In. (mm) Stem Clearance In. (mm) Valve Lift In. (mm)
1237 cc              
  Intake 1.335-1.342 (33.9-34.1) 45° 45° .0551 (1.4) .2591-.2594 (6.58-6.59) .0008.0020 (.02-.05) .....
  Exhaust 1.177-1.185 (29.9-30.1) 45° 45° .0551 (1.4) .2579.2583 (6.55-6.56) .0020-.0031 (.05-.08) .....
VALVE TIMING

Engine INTAKE EXHAUST
Open (ATDC) Close (ALDC) Open (BLOC) Close (BTDC)
1237 cc 10° 20° 30° 10°
PISTONS, PINS, RINGS

Engine PISTONS PINS RINGS
Clearance In. (mm) Piston Fit In. (mm) Rod Fit In. (mm) Rings End Gap In. (mm) Side Clearance In. (mm)
1237 cc 0-.0016 (0-.04) .0003-.0007 (.007-.014) (1).0006-.0015 (.016-.039) No. 1 .008-.016 (.20-.40) .0008-.0018 (.020-.045)
No. 2 .008-.016 (.20-.40) .0008-.0018 (.020-.045)
Oil .011-.039 (.3-.9) .....
(1) Interference fit.
Main Bearing Journals In. (mm)
Crankcase Counterbore Dia.  2.13 (54) A 
0 to.0002 (0 to.006)		 B 
.0002 to.0005 (.006 to.012)		 C 
.0005 to.0007 (.012 to.018)		 D 
.0007 to.0009 (.018 to.024)
Journal Dia.  1.97 (50)
1  Red  Pink  Yellow  Green 
0 to -.0002 (0 to -.006) -.0001 to -.0002 (-.002 to -.005) .00004 to -.0001 (.001 to -.002) .0002 to.00004 (.004 to.001) .0003 to.0002 (.007 to.004)
2  Pink  Yellow  Green  Brown 
-.0002 to -.0005 (-.006 to -.012) .00004 to -.0001 (.001 to -.002) .0002 to.00004 (.004 to.001) .0003 to.0002 (.007 to.004) .0004 to.0003 (.010 to.007)
3  Yellow  Green  Brown  Black 
-.0005 to -.0007 (-.012 to -.018) .0002 to.00004 (.004 to.001) .0003 to.0002 (.007 to.004) .0004 to.0003 (.010 to.007) .0005 to.0004 (.013 to.010)
4  Green  Brown  Black  Blue 
-.0007 to -.0009 (-.018 to -.024) .0003 to.0002 (.007 to.004) .0004 to.0003 (.010 to.007) .0005 to.0004 (.013 to.010) .0006 to.0005 (.016 to.013)
CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

Engine MAIN BEARINGS CONNECTING ROD BEARINGS
Journal Diam. In. (mm) Clearance In. (mm) Thrust Bearing Crankshaft End Play In. (mm) Journal Diam. In. (mm) Clearance In. (mm) Side Play In. (mm)
1237 cc 1.969-1.970 (49.9-50.0) .0009-.0017 (.024-.042) No. 2 .004-.014 (.10-.35) 1.575-1.576 (39.9-40.0) .0008-.0015 (.020-.038) .0059-.0118 (.15-.30)
Connecting Rod Bearing Journals In. (mm)
Connecting Rod Dia.  1.69 (43) 1 
0 to.0002 (0 to.006)		 2 
.0002 to.0005 (.006 to.012)		 3 
.0005 to.0007 (.012 to.018)		 4 
.0007 to.0009 (.018 to.024)
Crankpin Dia.  1.57 (40)
A  Red  Pink  Yellow  Green 
0 to -.0002 (0 to -.006) -.0002 to -.0003 (-.005 to -.008) -.0001 to -.0002 (-.002 to -.005) .00004 to -.0001 (.001 to -.002) .0002 to.00004 (.004 to.001)
B  Pink  Yellow  Green  Brown 
-.0002 to -.0005 (-.006 to -.012) -.0001 to -.0002 (-.002 to -.005) .00004 to -.0001 (.001 to -.002) .0002 to.00004 (.004 to.001) .0003 to.0002 (.007 to.004)
C  Yellow  Green  Brown  Black 
-.0005 to -.0007 (-.012 to -.018) .00004 to -.0001 (.001 to -.002) .0002 to.00004 (.004 to.001) .0003 to.0002 (.007 to.004) .0004 to.0003 (.010 to.007)
D  Green  Brown  Black  Blue 
-.0007 to -.0009 (-.018 to -.024) .0002 to.00004 (.004 to.001) .0003 to.0002 (.007 to.004) .0004 to.0003 (.010 to.007) .0005 to.0004 (.013 to.010)
TIGHTENING SPECIFICATIONS

Application Ft. Lbs. (mkg)
Main Bearing Cap 27-31 (3.7-4.3)
Connecting Rod Cap 18-21 (2.6-3.0)
Camshaft Support 13-16 (1.8-2.4)
Flywheel 34-38 (4.7-5.3)
Cylinder Head Bolts 37-42 (5.1-5.8)
Crankshaft Pulley 34-38 (4.7-5.3)
Timing Belt Pulley 18-25 (2.5-3.5)
Intake & Exhaust Manifolds 13-17 (2.0-2.5)
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