Page G-6
ENGINE
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notices, Cautions, Warnings and Dangers
COOLING SYSTEM CLEANING
At least once a year, or more often under adverse condi-
tions the cooling system should be cleaned. Cleaning
will assure an adequate supply of air to the cooling fins.
Compressed air may be used for routine cooling system
maintenance (Ref. Fig. 16).
Fig. 16 Cleaning Cooling System with Air
Operation in wet or damp weather or overly fresh cut
grass may result in a variety of debris accumulating and
adhering to the internal shroud and fins of the cooling
system.
SPARK PLUG
Tool List
Qty.
Spark Plug Socket,13/16" ............................................ 1
Feeler Gauge, wire type .............................................. 1
Ratchet & Extension .................................................... 1
Torque Wrench, ft. lbs.................................................. 1
This engine uses Spark Plug NGK BPR2ES with a gap
of .028" - .031" (.70 - .80 mm). Using a 13/16" spark plug
socket or wrench, remove the spark plug at 125 hours or
semi-annually and clean and re-gap. The spark plug
should be properly gapped (Ref. Fig. 17) and replaced in
the cylinder head, tighten to the specified torque.
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.
ITEM
TORQUE SPECIFICATION
Spark Plug
16 ft. lbs (22 Nm)
0.7 - 0.8 mm
(.028” - .031”)
Gap
Spark Plug
