Johnson J2R4SUC 2007 - Compression Testing

74
POWERHEAD
SPECIFICATIONS
SPECIFICATIONS
Item Unit
Data
2.5 HP
CYLINDER HEAD / CAMSHAFT
Cylinder head distortion Limit mm (in) 0.05 (0.002)
Cam height
IN, EX
STD mm (in) 28.480 – 28.680 (1.1213 – 1.1291)
Limit mm (in) 28.180 (1.1094)
Rocker arm
shaft hole
diameter
IN
STD mm (in) 4.015 – 4.027 (0.1581 – 0.1585)
EX
Rocker arm
shaft outside
diameter
IN
STD mm (in) 3.990 – 4.005 (0.1571 – 0.1577)
EX
VALVE / VALVE GUIDE
Valve diameter IN mm (in) 20.0 (0.79)
Valve diameter
EX mm (in) 18.0 (0.71)
Valve clearance
(Cold engine
condition)
IN STD mm (in) 0.13 – 0.17 (0.005 – 0.007)
Valve clearance
(Cold engine condition)
EX STD mm (in) 0.13 – 0.17 (0.005 – 0.007)
Valve seat angle IN — 45°
Valve seat angle
EX — 45°
Valve guide to
valve stem
clearance
IN
STD mm (in) 0.010 – 0.037 (0.0004 – 0.0015)
Valve guide to valve stem
clearance
Limit mm (in) 0.075 (0.0030)
EX
STD mm (in) 0.025 – 0.052 (0.0010 – 0.0020)
Limit mm (in) 0.090 (0.0035)
Valve guide
inside diameter
IN, EX STD mm (in) 4.000 – 4.012 (0.1575 – 0.1580) Valve guide inside diameter
Valve stem out-
side diameter
IN STD mm (in) 3.975 – 3.990 (0.1565 – 0.1571)
Valve stem outside diameter
EX STD mm (in) 3.960 – 3.975 (0.1559 – 0.1565)
Valve stem
deflection
IN, EX Limit mm (in) 0.35 (0.014) Valve stem deflection
Valve stem
runout
IN, EX Limit mm (in) 0.05 (0.002) Valve stem runout