65
14
13
METAL HAMMER
KNOCK OFF TOOL
SCREWDRIVER
TO RAISE
FLYWHEEL
12
FLYWHEEL
TOOL
FLYWHEEL
SOCKET WRENCH
LACKS POWER
1. Check the air intake for an obstruction (dirty filter, oil saturated filter, other debris).
2. Check the oil level, oil viscosity on the container of the oil being used and oil condition. Replace and fill
to the proper level.
3. Readjust the carburetor or remove the carburetor for cleaning. See Chapter 3 under "Service."
4. Check the exhaust port or muffler for a restriction preventing proper exhaust flow.
5. Check the engine valve lash. Reset the valves at the proper lash.
6. Check the valves for proper seating and valve guide clearance. Recondition the valves and seats.
Replace the valves if necessary. See "Cylinder Head and Valve Train Service" in this chapter.
7. Check the ignition timing. Check the flywheel key for partial shearing.
SERVICE
DISASSEMBLY PROCEDURE
The following procedures apply to most engine
models. Actual procedure may vary.
1. Disconnect the high tension lead from the spark
plug. Remove the spark plug.
2. Drain the oil from the crankcase. Drain or shut
off the fuel supply.
3. Remove the air cleaner assembly.
4. Remove the fuel tank if it is attached to the
engine. Fuel tanks may be held on with bolts,
screws, or some models require taps upward with
a soft face hammer loosening the plastic tank
wedges in the blower housing slots.
5. Remove the blower housing by first unscrewing
the screw holding the dipstick tube to the blower
housing and removing the remaining bolts
holding on the blower housing.
6. Unplug the ignition kill wire from the terminal on
top of the ignition module and unbolt the ignition
module.
7. Locate the piston at Top Dead Center (TDC) on
the compression stroke for easier valve train
service.
8. Relieve the compliance brake pressure on the
flywheel if applicable. Compress the spring by
moving the lever toward the spark plug end and
when the hole in the lever aligns with the hole in
the bracket secure the lever in this position with
alignment tool part # 670298.
9. Remove the flywheel nut, washer, and starter
cup. Use a part # 670305 strap wrench to hold
the flywheel from turning (diag. 12). Thread the
appropriate flywheel knock-off tool (7/16" / 11.112
mm use part # 670103, 1/2" / 12.7 mm use part
# 670169, 5/8" / 15.875 mm use part # 670314,
11/16" / 17.462 mm use part # 670329) on the
crankshaft until it bottoms out, then unthread it
one complete turn. Lift upward under the flywheel
using a large screwdriver while avoiding contact
with the alternator coils or magnets, and tap
sharply and squarely on the knock-off tool to
break the flywheel loose. If necessary, rotate the
flywheel a half turn and repeat until it loosens
(diag. 13). A flywheel puller (part # 670306) may
be used on flywheels with cored holes (diag. 14).
NOTE: DO NOT USE A JAW TYPE PULLER.
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