Service Manual

Engine Cleaning After Disassembly (cont'd)
7. Replace the fuel strainer on the pick-up tube inside
the fuel tank. See Figure 102.
Figure 102
8. Clean the primer pump passages, Valve cushions
and
ball valves.
Engine Inspection
Inspect all parts for wear and damage.
Do not reuse parts
that are damaged or worn beyond specification.
1. Crankshaft Axial Play
0.55mm (0.020')
Axial play can only be measured when the
crankshaft and crankcase are assembled.
If the
axial play was not measured during disassembly,
reassemble the crankshaft and crankcase with
bearings making certain to properly torque the
crankcase screws to 0.4 to
0.5 kg m (35 to 43 in
Ibs). See Figure 103.
Figure
103
2. Crankshaft Run-out
1
maximum allowable run-out:
0.06 mm (.0024')
With the crankshaft removed from the crankcase,
support the crankshaft on V-blocks. The V-blocks
should be positioned no closer than 4 mm (3116
inch) from the counter weights. Use a dial indicator
and measure run-out at the position shown in
Figure 104.
Figure 104
If any measurement is greater than the maximum
allowable limit, the crankshaft should be replaced.
Off-size crankshaft bearings are not available.
Piston Ring End Gap
maximum allowable end gap:
.7 mm (0.027")
Insert a piston ring into the cylinder skirt, making
certain the ring is not tilted. Use a piston to push
in the ring and ensure the ring is perpendicular in
the cylinder bore. Use a feeler gauge to measure
the piston ring gap between the ends of the piston
ring.
If the measured clearance is greater than the
.7 mm (0.0279, the piston rings may require
replacement. See Figure 105.
NOTE: Before replacing the piston rings, make
certain that the piston to cylinder clearance is
within specification.