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Piston
skirt clearance .004”~ .006” Maximum
permissible wear .010”
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Piston
ring gap: .008”~.010”
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Piston
ring groove clearance: Free
but not exceeding .005”
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Valve
stem diameter:
.348” (Inlet and Exhaust)
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Valve
guide bore: .3515”~ .3525”
(Inlet)
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Valve
guide bore:
.3525”~.3535” (Exhaust)
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Interference
fit of guide into cylinder:
.001”~.002”
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Tappet
stem: .373”~.3735”
(Inlet and Exhaust)
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Tappet
guide bore: .3745”~.3755”
(Inlet and Exhaust)
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Tappet
clearance: .010” (Inlet) .012”
(Exhaust)
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Cam
pinion spindle diameter: .623”~.6235”
(Inlet and Exhaust)
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Cam
pinion bush bore:
.6245”~.6255” (Inlet and Exhaust)
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Camshaft
end float with outrigger plate fitted: .002”~.003”
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Idler
pinion spindle diameter:
.748”~ .7485”
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Idler
pinion spindle bush bore:
.7495”~.7505”
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Idler
gear end float with outrigger plate fitted:
.002”~.003”
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Gudgeon
pin diameter: .750”
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Gudgeon
pin bush inside diameter: .7503”~ .7506” (upper size recommended )
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Gudgeon
pin bush outside diameter: .9395”~.9405” (upper size recommended.)
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Crankshaft
main bearing (drive side) spacer length:
1.000”~1.010”
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Mainbearing
interference fit into crankcase: .002”~.003” (cold)
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Timing
side outrigger plate bush bore:
.813”~.815”
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Crankshaft
pinion gear outside diameter:
.8115”~.812”
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Connecting
rod side float:
.010”~.015”
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Contact
breaker gap:
.012”
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Spark
plug gap:
.018”~.020”
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Ignition
advance (fully advanced): 7/16” (.4375”) B.T.D.C.
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