Nakayama BL4300, Owner'S Manual

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Dirty air filers reduce engine power increase fuel consumption and make starting more difficult.
If there is a noticeable loss of engine power
•
Turn choke knob to
• Release the screws (1) and pull off the filter cover (2).
• Remove the filter from the cover and inspect it - if it is dirty or damaged, clean the filter or fit a new one.
• Install the main filter and pre-filter elements in the filter cover.
• Fit the cover on the filter base and tighten it down firmly.
Carburetor
General information
Your carburetor comes from the factory with a standard setting.
This setting provides an optimum fuel-air mixture under most operating conditions.
The high speed screw alters the engine's power output and the maximum off-load engine speed.
If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.
Standard Setting
Carburetor with limiter caps
• Shut off the engine.
• Screw down the high speed screw (H) and low speed screw (L) counterclockwise as far as
stop (no more than 1/4 turn).
Carburetor without limiter caps
• Shut off the engine.
•
Carefully screw both adjusting screws down onto their seats (clockwise).
•
Open the high speed screw (H) one full turn.
• Open the low speed screw (L) one full turn.
Adjusting idle Speed
Engine stops while idling
• Carry out standard setting on low speed screw.
• Turn the idle speed screw (LA) clockwise until the engine runs smoothly.
Erratic idling behavior, poor acceleration
•
Carry out standard setting on low speed screw.
•
Turn low speed screw (L) counterclockwise until the engine runs and accelerates
smoothly.
It is usually necessary to change the setting of the idle speed screw (LA) after every
correction to the low speed screw (L).
Fine Tuning for Operation at High Altitude
A slight correction of the setting may be necessary if engine power is not satisfactory when operating at high altitude:
•
Check the standard setting.
• Warm up the engine.
• Turn the high speed screw (H) slightly clockwise (leaner). On models with limiter caps, turn high speed screw (H) 1/4 turn,
but no further than stop.
If the
setting is too lean
there is a
risk of engine damage
due to insufficient lubrication and overheating.
Checking the Spark Plug
If engine is down on power, difficult to start or runs poorly at idle speed first check the spark
plug.
• Remove the spark plug - see "Starting / Stopping the Engine"
• Check electrode gap (A) and readjust if necessary - see "Specifications".
LA