14-1
SECTION 14: SPECIFICATIONS
STANDARD AND REJECT DIMENSIONS
DESCRIPTION STANDARD DIMENSION REJECT DIMENSION
CYLINDER:
Bore 90.00 – 90.025 mm (3.543” – 3.544”) 90.10 mm (3.547”)
Out of Round 0.035 mm (.0015”)
Main Bearing 38.044 – 38.099 mm (1.498” – 1.5”) 38.25 mm (1.506”)
Cam Bearing 20.00 – 20.03mm (.787” – .789”) 20.06 mm (.790”)
CYLINDER HEAD:
Valve Guide 7.005 – 7.020 mm (.2758” – .2764”) 7.06 mm (0.278”)
Valve Stem 6.945 – 6.98 mm (.2734” – .2748”) 6.9 mm (0.272”)
CRANKCASE COVER:
Main Bearing 42.044 – 42.099 mm (1.6553” – 1.6574”) 42.25 mm (1.663”)
Cam Bearing 18.0 – 18.025 mm (.7087” – .7096”) 18.06 mm (.711”)
CRANKSHAFT:
Crankpin 38.99 – 39.01 mm (1.535” – 1.536”) 38.96 mm (1.534”)
Magneto Journal 38.00 – 38.012 mm (1.496” – 1.4965”) 37.85 mm (1.490”)
PTO Journal 42.00 – 42.012 mm (1.6535” – 1.654”) 41.85 mm (1.648”)
CAMSHAFT:
Magneto Journal 19.959 – 19.98 mm (.7858” – .7866”) 19.93 mm (.784”)
PTO Journal 17.964 – 17.982 mm (.7072” – .708”) 17.93 mm (.705”)
Lobes 31.239 – 31.479 mm (1.2299” – 1.2393”) 31.02 mm (1.221”)
CONNECTING ROD:
Crankpin Bearing 39.06 – 39.07 mm (1.5378” – 1.5382”) 39.09 mm (1.539”)
Piston Pin Bearing 20.02 – 20.03 mm (.7882” – .7886”) 20.05 mm (.7894”)
PISTON PIN:
Diameter 19.984 – 19.995 mm (.7868” – .7872”) 19.97 mm (.7862”)
Out of Round 0.01 mm (.0005”)
PISTON PIN BEARING (PISTON):
Bore 20.00 – 20.02 mm (.7874” – .7882”) 20.03 mm (.7886”)
Out of Round 0.01 mm (.0005”)
PISTON RINGS:
End Gap – Top & Center 0.25 – 0.5 mm (.0098” – .0197”) 0.75 mm (.0295”)
End Gap – Oil 0.38 – 1.15 mm (.015” – .045”) 1.5 mm (.059”)
Ring Side Clearance – Top & Center 0.04 – 0.09 mm (.0016” – .0035”) 0.10 mm (.004”)
Ring Side Clearance – Oil 0.012 – 0.18 mm (.0005” – .007”) 0.20 mm (.008”)
COMMON SPECIFICATIONS
Armature Air Gap .008” – .012” (0.20 – 0.30 mm)
Crankshaft End Play .002” – .015” (0.05 – 0.40 mm)
Spark Plug Gap .030” (0.76 mm)
Valve Clearance (Cold)
– Intake .002” – .004” (0.05 – 0.1 mm)
– Exhaust .002” – .004” (0.05 – 0.1 mm)
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