Bolens 390 - Manual (Page 9)

Figure 12.
Figure 13.
Figure 14.
CLUTCH CONTROL ADJUSTMENTS
To adjust the clutch controls, refer to the Final Adjust­
ment section of assembly instructions.
CARBURETOR ADJUSTMENT
A WARNING: If any adjustments are made to
the engine while the engine is running
(e.g. carburetor), disengage all clutches
and tines. Keep clear of all moving parts.
Be careful of heated surfaces and muffler.
Minor carburetor adjustment may be required to com­
pensate for differences in fuel, temperature, altitude or
load. If adjustments are needed, refer to the engine
manual packed with the tiller.
NOTE: A dirty air cleaner will cause engine to run
rough. Be certain air cleaner is clean and attached to
the carburetor before adjusting carburetor. Do not
make unnecessary adjustments. Factory settings are
satisfactory for most applications and conditions.
LUBRICATION
A
WARNING: Always stop engine and dis­
connect spark plug wire before cleaning,
lubricating or doing any kind of work on
tiller.
Pivot Points-Remove the belt cover and lubricate all
moving parts and pivot points at least once a season
using SAE 30 engine oil.
Chain Drive-The chain case is pre-lubricated and
sealed at the factory.
MAINTENANCE A
WARNING: Disconnect spark plug wire
and ground it against the engine before
performing any repairs or maintenance.
TROUBLE SHOOTING
Refer to page 12 of this manual for trouble shooting
information.
ENGINE
Refer to the separate engine manual for all engine
maintenance instructions.
Maintain engine oil as instructed in the separate
engine manual packed with your unit. Read and follow
instructions carefully.
Service air cleaner every 25 hours under normal con­
ditions. Clean every few hours under extremely dusty
conditions. Poor engine performance and flooding
usually indicates that the air cleaner should be
serviced. To service the air cleaner, refer to the sepa­
rate engine manual packed with your unit.
IMPORTANT: Never run your engine without air
cleaner completely assembled.
The spark plug should be cleaned and the gap reset
once a season. Spark plug replacement is recom­
mended at the start of each tilling season; check
engine manual for correct plug type and gap specifica­
tions.
Clean the engine regularly with a cloth or brush.
Keep the cooling system (blower housing area) clean
to permit proper air circulation which is essential to
engine performance and life. Be certain to remove all
dirt and combustible debris from muffler area.