Parameter
Transverse = parallel to crankshaft axis
Longitudinal = parallel to motorcycle axis
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Dim’n
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Wear
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Data Source
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Position
Cylinder number 1-4
Bearing 1 = TS Front; Bearing 2 = TS Rear; Bearing 3 = DS Rear; Bearing 4 = DS Front;
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Number 1
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Number 2
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Number 3
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Number 4
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Cylinder Bore upper transverse
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2.579”
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0.008”
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Waller (2.559” +0.020” overbore
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2.582”
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2.582”
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2.582”
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2.582”
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Cylinder Bore upper longitudinal (A)
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2.582”
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2.582”
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2.582”
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2.582”
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Cylinder Bore middle transverse
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1 ½” down from gasket face
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2.580”
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2.580”
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2.580”
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2.580”
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Cylinder Bore middle longitudinal (B)
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2.582”
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2.582”
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2.582”
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2.582”
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Cylinder Bore lower transverse
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2.578”
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2.578”
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2.578”
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2.578”
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Cylinder Bore lower longitudinal (C)
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2.578”
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2.578”
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2.578”
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2.578”
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Piston (ring land area longitudinal) (A1)
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2.568”
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2.568”
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2.567”
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2.568”
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Piston (ring land area clearance) (A-A1)
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0.023”
0.020”
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Waller
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0.014”
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0.014”
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0.015”
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0.014”
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Piston (below rings longitudinal) (B1)
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2.575”
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2.575”
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2.575”
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2.576”
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Piston (below rings clearance) (B-B1)
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0.005”
0.003”
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Waller
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0.007”
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0.007”
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0.007”
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0.006”
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Piston (Extreme Skirt longitudinal) (C1)
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2.577”
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2.569”
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2.576”
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2.576”
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Piston (Extreme Skirt clearance) (C-C1)
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0.003”
0.001”
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Waller
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0.001”
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0.009”
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0.002”
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0.002”
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Piston Ring Gap (Compression)
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0.017”
0.012”
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Waller
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>0.060”
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>0.060”
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>0.060”
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>0.060”
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Piston Ring Gap (Oil Control)
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0.020”
0.015”
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Waller
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>0.060”
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>0.060”
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>0.060”
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>0.060”
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Piston Ring Groove Clearance (Upper Compression)
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0.002”
0.0015”
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Irving: Tuning for Speed
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Piston Ring Groove Clearance (Lower Compression)
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0.002”
0.0015”
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Irving: Tuning for Speed
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Piston Ring Groove Clearance (Oil Control)
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0.004”
0.003”
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Irving: Tuning for Speed
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Piston Weight
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Gudgeon Pin
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0.6865”
0.6862”
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0.6865”
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0.6865”
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0.6865”
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0.6865”
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Gudgeon Pin Weight
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Piston & Gudgeon Pin Weight
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Inlet valve stem
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0.312”
0.311”
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Exhaust valve stem
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0.310”
0.309”
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Inlet valve guide bore
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0.314”
0.313”
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Exhaust valve guide bore
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0.314”
0.313”
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Rocker Shaft
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0.499”
0.498”
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Rocker bush
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0.5005”
0.4995”
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Small End bush
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0.6868”
0.6863”
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0.003”
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0.689”[1]
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0.689”1
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Crankshaft Big end journal
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1.3745”
1.375”
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1.373”
1.3725”
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1.374”
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Con Rod Big end eye
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0.004”
0.003”
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1.384”
0.009”[2]
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1.383”
0.008”
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Camshaft lobes
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Samples show 0.003” – 0.005” wear
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Camshaft (bush end)
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0.8735”
0.873”
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Waller 4G
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0.871”
0.869”
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Camshaft bush in crankcase
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0.875-0.874”
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Waller 4G
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0.874”
0.872”[3]
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Timing side crankshaft main bearing journal
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1.252”
1.2515”
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0.005-0.004”
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1.247”[4]
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1.248”4
1.2475”
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Timing side crankshaft main bearing bush
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1.250-1.2495”
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0.005-0.004”
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1.2545”[5]
1.252”
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1.2525”5
1.2505”
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Crankshaft End Float
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0.004”
0.002”
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’52 Owners Guide p.23
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>0.015”
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>0.015”
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Oil pump drive block
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0.561” – 0.563”
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Oil pump drive block clearance to camshaft nut
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0.005”
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Oil pump feed plunger block gap
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0.573”
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Oil pump return plunger block gap
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0.570”
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Oil pump feed plunger (D)
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0.1870-0.1875”
Waller; Singles
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0.436” – 0.4365”
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Oil pump feed bore (D1)
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0.1875-0.1880”
Waller; Singles
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0.437” – 0.438”
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Oil Pump Feed Clearance (D-D1)
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0.001”
0.000”
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0.002”
0.0005”
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Oil pump return plunger (E)
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0.3745-0.3750”
Waller; Singles
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0.4995” – 0.499”
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Oil pump return bore (E1)
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0.3750-0.3755”
Waller; Singles
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0.499” – 0.500”
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Oil Pump Return Clearance (E-E1)
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0.001”
0.000”
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0.001”
0.000”
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Parameter
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Dim’n
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Wear
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Data Source
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Drive Side
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Kickstart Side
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Sleeve Gear Bush
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0.939”
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0.939”
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Mainshaft at sleeve gear
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Waller
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0.932”
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0.932”
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Mainshaft clearance at sleeve gear
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0.002”
0.0015”
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0.007”
0.006”
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Waller
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0.007”
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0.007”
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Mainshaft bending
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0.005”
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Waller
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Mainshaft end float
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1/32”
1/64”
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Layshaft Bush
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0.658”
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0.6585”
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Layshaft Bush clearance
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0.007”
0.005”
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Waller
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0.007”
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0.0045”
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Layshaft
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None
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0.651”
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0.654”
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Layshaft bending
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0.005”
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Waller
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Camshaft Bush
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0.502”
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Camshaft
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None
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0.496”
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Camshaft Bush clearance
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0.007”
0.005”
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Waller
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0.006”
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Camshaft end float
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0.002”
0.001”
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Layshaft 1st Bush
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1.212”
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Layshaft 1st Pinion
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1.215”
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Layshaft 1st clearance
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0.003”
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Layshaft 2nd Bush
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1.2095”
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Layshaft 2nd Pinion
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1.214”
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Layshaft 2nd clearance
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0.0045”
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Roller Bearings
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Play present
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[1] Little end bush at top end of acceptable tolerance. Replace.
[2] Little end bush oil hole misaligned.
[3] Camshaft journal is in poor condition, needing a light regrind. Bush diameter must be finish bored to provide factory clearance (0.0005 – 0.002”).
[4] Journals are at bottom of acceptable tolerance. Bush diameter must be finish bored to provide factory clearance (0.0015 – 0.0025”).
[5] Clearances acceptable but white metal flaking from both front & rear bushes. Bushes to be replaced.
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