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ENGINE
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
2.
Rotate the crankshaft to position the cylinder to be
B
tested 10°-15° past TDC so that the exhaust valve is
closed.
3.
Lock the crankshaft in position with a strap wrench
wrapped around the drive clutch.
4.
Select the spark plug adapter that fits the spark plug
hole.
5.
Connect the leak down gauge.
6.
Turn the regulator knob counterclockwise to zero out
the incoming pressure.
7.
Connect the compressed air hose and turn the regu-
lator knob clockwise to pressurize the cylinder.
8.
Compare the reading of the compression gauge with
the setting on the regulator to obtain the leak down
percentage.
9.
Repeat the process for the next cylinder.
10. Record the leakage percentage for each cylinder.
Maximum leak down should run no more than 10 -
15%.
11. Listen to see if air is escaping through the carburetor,
the oil filler or the exhaust. Air leaking through the
carburetor or throttle body indicates poor sealing of
the intake valve. Leaking from the tail pipe indicates
poor exhaust valve sealing. Air leaking around the
outside of the head gasket flange indicates a blown
head gasket.
Rocker Cover Removal
Tool List
Ratchet ........................................................................ 1
Extension 6"................................................................. 1
Socket, 10 mm............................................................. 1
1.
Remove the four bolts (5) securing the rocker cover.
2.
Remove the rocker cover (6) and the gasket.
Fig. 17 Rocker Cover
120
Qty.
6
5
Repair and Service Manual
Valve Clearance Inspection
Tool List
Allen Bit, 3 mm.............................................................1
Ratchet.........................................................................1
Extension, 6" ................................................................1
Feeler Gauge ...............................................................1
Wrench, 14 mm............................................................1
Torque Wrench, in. lbs. ...............................................1
NOTICE: The valve clearance must be checked
when the engine is cold (at room temperature).
1.
With the rocker cover removed, place the piston at
TDC on the compression stroke by turning the crank-
shaft in its rotational direction.
2.
Check the valve clearance with a feeler gauge (7).
Measure the valve clearance between the rocker
arm (8) and the valve stem end.
3.
Valve clearance (when cold): Inlet, Exhaust 0.10 -
0.15 mm (0.004 - 0.006 in.).
7
8
Fig. 18 Measure Valve Clearance
4.
If the valve clearance is incorrect, adjust it.
Valve Clearance Adjustment
1.
Turn the crankshaft in the proper direction until the
piston is at TDC of the compression stroke.
Fig. 19 Valve Clearance Adjustment
2.
Valve clearance (when cold): Inlet, Exhaust 0.10 -
0.15 mm (0.004 - 0.006 in.).
Qty.
7
10
11
653045
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