Four Cycle Engine; Engine Specifications; Engine Description; Cylinder Head - Cushman HAULER 800X Technician's Repair And Service Manual

Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Spark Plug
(.028" - .031")
Fig. 17 Gapping the Spark Plug
Fouled spark plugs are indicated by a wet, black appear-
ance. This could be caused by a dirty air filter element or
other restrictions in the air intake system. Incorrectly
adjusted valves, spark plug wires which are in poor con-
dition or poor quality fuel could also contribute to the
problem.
Use care not to over-tighten the plug. Over-tightening can
cause damage to the aluminum cylinder head threads.

FOUR CYCLE ENGINE

Engine Specifications

Engine Model ................................................. FJ400-D
Type.................................. Four Cycle, Overhead Valve
Number Of Cylinders................................................... 1
Displacement.......................................................401 cc
Rated Horsepower ............................................... 13 hp
Spark Plug Type ..................................... NGK BPR2ES
Spark Plug Gap ...................028" - .031" (.70 - .80 mm)
Cooling ............................................. Forced Air Cooled
Oil Filter ......................... Cartridge Type Full Flow Filter
Oil Pump.......................... Positive Displacement Pump

Engine Description

The engine is an air cooled, 4-stroke, overhead valve,
single cylinder gasoline engine. It incorporates a pres-
sure fed lubrication positive displacement oil pump with
a cartridge type full flow oil filter and a counter rotating
balance shaft.
0.7 - 0.8 mm
Gap
Repair and Service Manual

CYLINDER HEAD

Compression Measurement

Tool List
Ratchet ........................................................................1
Spark Plug Socket .......................................................1
Extension 6".................................................................1
Compression Gauge & Adapter (20 kgf/cm
Before measuring compression, do the following:
• Be sure the battery is fully charged.
• Thoroughly warm up the engine so that engine oil
between the piston and cylinder wall will help seal
compression as it does during normal running.
• Stop the engine.
Disconnect the spark plug cap (3) and remove the spark
plug (4) keeping the engine throttle and the choke valve
fully open.
Attach the compression gauge (1) to the adapter (2) and
insert firmly into the plug hole.
4
Fig. 18 Compression Gauge
Place the spark plug cap (3) on the removed spark plug
(4) and ground the spark plug to the engine.
To prevent possibility of personal injury or fire,
do not ground the spark plug in proximity to the
plug hole. Keep the plug as far away as possi-
ble from the plug hole. Fuel drawn into the cyl-
inder will be expelled through the spark plug
opening and could be ignited by the ignition
system or another source, resulting in a fire
Using the starter motor, turn the engine over with the
throttle fully open until the compression gauge stops ris-
ing.
ENGINE
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