Maintenance; Idle Speed Adjustment - Maruyama B420L Manual Del Propietario U Operador

Maintenance

Maintenance, replacement or repair of emission
control devices and systems may be performed by
any repair establishment or individual; however,
warranty repairs must be performed by a dealer or
service center authori zed by MARU YAMA
Manufacturing Company, Inc. The use of parts that
are not equivalent in performance and durability to
authorized parts may impair the effectiveness of the
emission control system and may have a bearing on
the outcome of a warranty claim.
Maintenance on today's low-emission engines is
even more critical for longest life and best
performance. Particularly critical are air and fuel
filters, spark plug heat range, cooling air intake
area and proper gaps of coil and plug.

Idle Speed Adjustment

This Trimmer/Brushcutter is equipped with non-
adjustable fuel mixture carburetor. The engine idle
speed is the only adjustment for the operator.
WARNING
• Idle speed adjustment should be checked
each time the unit is operated.
WARNING
POTENTIAL HAZARD
• Engine must be running to make carbu-
retor adjustments.
• When engine is running, cutting head is
rotating and other parts are moving.
WHAT CAN HAPPEN
• Contact with rotating cutting head or
other moving parts could cause serious
personal injury or death.
HOW TO AVOID THE HAZARD
• Keep hands, feet and clothing away from
cutting head and other moving parts.
• Keep all bystanders and pets away from
u n i t w h i l e m a k i n g c a r b u r e t o r
adjustments.
The cutting head may be rotating during idle speed
adjustment. Wear the recommended personal protective
equipment and observe all safety instructions. Keep
hands and body away from the cutting head.
When the throttle trigger is released, the engine should
return to an idle speed between 2400 - 2800 RPM, or
just below the clutch engagement speed. The cutting
head must not rotate and the engine should not stall
(stop running) at engine idle speed.
To adjust the engine idle speed, rotate the idle speed
adjustment screw on the carburetor.
• Turn the idle speed screw in (clockwise) to
increase the engine idle speed.
• Turn the screw out (counter-clockwise) to decrease
the engine idle speed.
If idle speed adjustment is necessary, and after
adjustment the cutting head rotates or the engine stalls,
stop using the Trimmer/Brushcutter immediately!
Contact your local authorized MARUYAMA Dealer
for assistance and servicing.
— US-20 —
Idle Speed
Adjustment Screw