Bolens 12207 - Manual (Page 14)

14
Engine Air Filter
It is very important that air filter service be performed accord-
ing to the maintenance schedule. Refer to the separate Engine
Owner’s Manual for inspection and cleaning instructions.
IMPORTANT: Never run engine without air filter assembly prop-
erly installed.
Carburetor Adjustment
If the engine is running poorly or has low power while tilling, an
adjustment to the carburetor may solve the problem. However,
first inspect and service the spark plug and the air filter before
making a carburetor adjustment. If the engine continues to run
poorly (and the fuel mixture is fresh), proceed to the following
carburetor adjustment instructions.
This factory-engineered instruction is designed to provide con-
tinued optimum engine operating performance after the engine
break-in period, which is approximately 5 to 10 hours. The ad-
justment, when properly performed as described below, will not
void the engine warranty. A common screwdriver is needed. If
you prefer, see an authorized engine dealer for adjustment.
Prior to Carburetor Adjustment:
• Let engine cool for 30 minutes before continuing.
• From the operator’s position behind the handlebars, lay the
machine down on its left side (muffler side).
Carburetor Adjustment:
• Locate the carburetor idle mixture screw (Figure 15). It is
directly under the air filter and is black. Do Not Adjust The
Silver-Colored Screw.
• Turn the idle mixture screw 1/16 of a turn clockwise.
• Return the unit to its normal upright operating position and
reconnect the spark plug wire.
If the engine continues to run poorly, please contact an autho-
rized engine dealer.
Spark Plug
Inspect the spark plug annually or every 75 operating hours ac-
cording to the instructions in the separate Engine Owner’s Man-
ual. Use a wire feeler gauge to be sure the gap is .030". For re-
placement use Champion RCJ-6Y or equivalent (a resistor
spark plug must be used for replacement).
Cooling System
It is important to frequently check and remove grass clippings,
dirt and other debris that accumulates on the engine, cooling
fins, air intake screen and on levers and linkages. This helps to
ensure adequate air cooling and correct engine speed.
TINE REMOVAL AND INSTALLATION
The tines will wear with use and they should be replaced if till-
ing seems to take longer than usual or if the soil is not being
mixed as thoroughly. Also, in addition to the standard 10" till-
ing width tine configuration, the tines can be arranged in two
other configurations: (1) A narrow, 4
1 / 2 " tilling width for smaller
areas and (2) A special pattern for stony soil conditions.
IMPORTANT: The ring lock pin (A, Figure 16) is under spring
tension – wear gloves to protect your fingers when removing or
replacing the ring lock pin.
Tine Pattern for a Narrow, 4-1/2" Wide Tilling Width:
• Prop the machine forward so it rests on the front of the tubu-
lar carrying handle. The work surface should be flat and firm.
• Flip open the ring (A, Figure 16) on the left side ring lock pin
and remove the ring lock pin.
• Remove the outer tine section (do not remove inner tine sec-
tion) and mark it as to which side it is from (left or right) and
whether it’s an outer or inner tine section.
MAINTENANCE/SERVICE
Figure 15: Idle Mixture Screw can be adjusted.
Fuel Tank
Primer Bulb
Primer Line
Idle Speed Screw (Silver)
Idle Mixture Screw (Black)
Fuel Line
Do not tamper with the engine governor screw which is
factory-set for the proper engine speed. Overspeeding the
engine beyond the factory high speed setting can be danger-
ous and will void the engine warranty. Authorized service
shall be sought if a problem exists.
WARNING
The temperature of the muffler and adjacent engine areas
may exceed 150
o F (65 o C). Contact may cause burns. Avoid
these areas. Remove the spark plug lead and ground the
lead to the engine to prevent accidental starts and fires.
Failure to do this could cause personal injury.
WARNING
Avoid contact with the cutting edges on the tines.
To avoid personal injury when removing or installing tines,
wear heavy work gloves. The engine must be off, all moving
parts completely stopped, and the spark plug wire discon-
nected from the spark plug and moved away from the plug.
WARNING