61/65/70/75 Series Horizontal Shaft Engines
116
70 75
minimum maximum minimum maximum
SAE mm SAE mm SAE mm SAE mm
Displacement 12.7 cu in 208cc 14.8cu in 243 cc
Bore 2.756 70.000 2.756 70.010 2.953 75.000 2.953 75.010
Stroke 2.126 54.000 2.126 54.000 2.165 55.000 2.165 55.000
Compression Ratio 8.7:1 8.7:1
Cranking Pressure 40 - 70 psi (2.8 - 4.8 bar) 40 - 70 psi (2.8 - 4.8 bar)
Module air gap 0.016 0.400 0.024 0.600 0.016 0.400 0.024 0.600
Spark plug gap 0.024 0.600 0.031 0.800 0.024 0.600 0.031 0.800
Intake valve lash 0.004 0.100 0.006 0.150 0.004 0.100 0.006 0.150
Exhaust valve lash 0.006 0.150 0.008 0.200 0.006 0.150 0.008 0.200
Crankshaft end play 0.000 0.000 0.011 0.275 0.000 0.000 0.011 0.275
Crank pin diameter 1.181 29.985 1.181 29.995 1.181 29.985 1.181 29.995
Crankshaft journal OD
(flywheel end)
0.983 24.980 0.984 24.993 0.983 24.980 0.984 24.993
Crankshaft journal OD
(PTO end)
0.983 24.980 0.984 24.993 0.983 24.980 0.984 24.993
Connecting rod max. ID
(crank side)
1.182 30.015 1.191 30.250 1.182 30.015 1.191 30.250
Connecting rod max. ID
(piston side)
0.717 18.204 0.717 18.212 0.717 18.204 0.717 18.212
Piston pin 0.716 18.190 0.716 18.198 0.716 18.190 0.716 18.198
Piston pin bore 0.717 18.202 0.717 18.208 0.717 18.202 0.717 18.208
Connecting rod to crank
pin running clearance
0.001 0.020 0.002 0.040 0.001 0.020 0.002 0.040
Crankshaft bearing ID
(sump)
2.045 51.949 2.046 51.979 2.045 51.949 2.046 51.979
Cam shaft OD
(cylinder block)
0.558 14.166 0.558 14.184 0.558 14.166 0.558 14.184
Cam shaft OD
(sump side)
0.558 14.166 0.558 14.184 0.558 14.166 0.558 14.184
Cam shaft bearing ID
(cylinder block)
0.559 14.200 0.560 14.218 0.559 14.200 0.560 14.218
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