SPECIFICATION: STANDARD
DIMENSION:
LIMIT:
UNIT OF MEASUREMENT:
inches
mm inches mm
Spark plug gap;
.026"
.65
.023~.028”
.06~.07
Coil/flywheel gap:
.014"
.35
.012~016”
.3~.4
Valve adjustment (cold):
Intake:
.003"
0.08
0.002"
0.008
Exhaust:
.004"
0.10
0.002"
0.008
Piston diameter:
1.492"
37.9
1.490"
37.85
Piston pin bore diameter:
.394"
10
0.3941"
10.01
Ring groove width:
.056"
1.5
.065”
1.56
Piston/cylinder clearance:
.0039"
.10
---
---
Ring/groove clearance:
.001~.0026”
.025~.065
0.006"
0.15
Cylinder inside (bore) diameter:
1.496"
38.0
1.497"
38.02
Cylinder out-of-round:
.00039"
.010
0.0012"
.03
Cylinder taper:
.00059"
.015
0.002"
0.05
Piston ring width:
.059"
1.5
.057"
1.45
Piston ring thickness:
.059"
1.5
0.055"
1.4
Piston ring end gap:
.0039~.0118"
0.1~0.3
0.024"
0.6
Piston pin diameter
.394"
10.0
0.3935"
9.994
Connecting rod small end diameter:
.551"
14.0
.552"
14.02
Cam lobe height:
.898~.910"
22.85~23.15
0.887"
22.5
Pushrod length:
2.559"
65 2.551" 64.9
Cam gear/rocker/follower shaft dia.
.1965~.1967"
4.997~5.00
0.195
4.957
Cam gear inside diameter:
.197~.199"
5.03~5.06 0.2"
5.10 (+- .040)
23
Section
10 T3410 Tolerances & Wear Limits
Edition 2 • 09/2007
