Master Specifications
Page 1A-6 90-8M0065421 NOVEMBER 2012
Camshaft and Valve Specifications
Camshaft and Valve Specifications
Camshaft
Runout limit 0.03 mm (0.0012 in.)
Cam lobe height (intake and exhaust) 23.78–24.04 mm (0.94–0.95 in.)
Upper bearing O.D. 11.95–11.97 mm (0.4705–0.4713 in.)
Lower bearing O.D. 12.95–12.97 mm (0.5098–0.5106 in.)
Valve spring free length 33.2–35.0 mm (1.307–1.378 in.)
Valve spring tilt limit 2 mm (0.079 in.)
Valve guide
Intake 5.51–5.55 mm (0.2169–0.2185 in.)
Exhaust 5.51–5.57 mm (0.2169–0.2193 in.)
Valve stem O.D.
Intake valve 5.45–5.47 mm (0.2146–0.2154 in.)
Exhaust valve 5.44–5.46 mm (0.2142–0.2150 in.)
Valve stem to valve guide clearance
Intake 0.018–0.070 mm (0.0007–0.0028 in.)
Exhaust 0.025–0.080 mm (0.0010–0.0031 in.)
Valve seat angles
First 30°
Second 45°
Third 60°
Valve stem seal color
Intake Black
Exhaust Green
Valve seat width (intake and exhaust) 1.0–2.0 mm (0.0394–0.0787 in.)
Valve to rocker arm clearance
Intake 0.06–0.14 mm (0.0024–0.0055 in.)
Exhaust 0.11–0.19 mm (0.0043–0.0075 in.)
Gear Housing Specifications
Gear Housing Specifications
Gear ratio
Model 2.5/3.5 2.15:1
Gear housing capacity 180 mL (6.1 fl oz)
Gear lubricant type Premium or High Performance Gear Lubricant
Pinion teeth 13
Forward gear teeth 28
Clutch Dog type (forward ‑ neutral)
Forward gear backlash 0.050–0.152 mm (0.002–0.006 in.)
Propeller drive system Drive (shear) pin
Propeller shaft trueness serviceability limit 0.152 mm (0.006 in.) maximum
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