Service Manual

1-6
Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
GENERAL SERVICE INFORMATION
Engine Component Specications
Part Item Standard Service Limit
Engine Operating (Top) RPM 3300 ± 100 RPM -
Idle RPM 1800 ± 150 RPM -
Cylinder Head Warpage - 0.00197 in. (0.05 mm)
Cylinder Sleeve Taper/Out of Round
(Inside Diameter)
3.0315 - 3.0319 in.
(77 - 77.01 mm)
3.0354 in. (77.10 mm)
Piston Skirt Outside Diameter 3.620 - 3.621 in.
(76.965 - 76.975 mm)
3.0219 in. (76.755 mm)
Cylinder Clearance 0.00098 - 0.00177 in.
(0.025 - 0.045 mm)
0.01 in. (0.255 mm)
Piston Pin Bore Inside
Diameter
0.6694 - 0.6696 in.
(17.002 - 17.008 mm)
0.674 in. (17.12 mm)
Piston Pin Clearance 0.00016 - 0.00063 in.
(0.004 - 0.016 mm)
0.0011 in. (0.029 mm)
Piston Pin Outside Diameter 0.669 - 0.6692 in.
(16.992 - 16.998 mm)
0.6654 in. (16.90 mm)
Piston Rings Ring To Groove (Top and
Middle)
0.00079 - 0.00236 in.
(0.02 - 0.06 mm)
0.00433 in. (0.11 mm)
End Gap (Top and Middle) 0.0079 - 0.0157 in.
(0.20 - 0.40 mm)
0.0177 in. (0.45 mm)
Width (Top) 0.038 - 0.039 in.
(0.97 - 0.99 mm)
0.0354 in. (0.90 mm)
Width (Middle) 0.046 - 0.047 in.
(1.17 - 1.19 mm)
0.0433 in. (1.10 mm)
Width (Oil Ring) 0.11 - 0.126 in.
(1.65 - 1.85 mm)
0.1063 in. (1.60 mm)
Connecting Rod Small End Inside Diameter 0.6695 - 0.66996 in.
(17.006 - 17.017 mm)
0.6713 in. (17.05 mm)
Large End Inside Diameter 1.5754 - 1.5758 in.
(40.015 - 40.025 mm)
1.5774 in. (40.065 mm)
Large End Side Clearance 0.000945 - 0.00311 in.
(0.024 - 0.079 mm)
0.0051 in. (0.129 mm)
Crankshaft All Three Bearing Diameters 1.5735 - 1.5744 in.
(39.966 - 39.991 mm)
1.5551 in. (39.50 mm)
Valve Clearance (cold) (Intake) 0.004 - 0.006 in.
(0.10- 0.15 mm)
-
Clearance (cold) (Exhaust) 0.006 - 0.008 in.
(0.15 - 0.20 mm)
-
Stem Diameter (Intake) 0.2584 - 0.2590 in.
(6.565 - 6.58 mm)
0.2565 in. (6.515 mm)
Stem Diameter (Exhaust) 0.2577 - 0.2583 in.
(6.545 - 6.56 mm)
0.2557 in. (6.495 mm)