ENGINE
B2420, WSM
1-S31
Water Pump
1. Remove the water pump flange.
(When reassembling)
• Before installing the water pump flange gasket, apply liquid
gasket (Three Bond 1215 or equivalent) to the both side.
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Gear Case
1. Remove the gear case.
2. Remove the crankshaft collar and O-ring.
(When reassembling)
• Replace the gear case gasket with a new one.
• Be sure to set the O-ring on the crankshaft.
• Apply a thin film of engine oil to the oil seal, and install it, noting
the lip come off.
• Length of the gear case mounting screws. (Refer to the figure.)
A: 45 mm (1.8 in.)
B: 50 mm (2.0 in.)
C: 55 mm (2.2 in.)
D: 59 mm (2.3 in.)
E: 68 mm (2.7 in.)
F: 80 mm (3.1 in.)
G: Nut
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Speed Control Plate
1. Remove the speed control plate and governor lever (1) from the
governor springs 1 (2) and 2 (3).
(When reassembling)
• Securely catch the governor springs 1 and 2 on the governor
lever as shown in the figure.
• Apply a liquid gasket (Three Bond 1215 or equivalent) to both
sides of the speed control plate gasket.
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(1) Governor Lever
(2) Governor Spring 1
(3) Governor Spring 2
(4) Fork Lever 2
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