RedMax G5300 Operator's Manual download pdf (Page 30)

MAINTENANCE

30 – English

General

The user must only carry out the maintenance and

service work described in this manual.

Carburetor adjustment

Every unit is run at the factory and the carburetor is set in

compliance with emission regulations. Therefore the

chain saw is equipped with movement limiters on the

carburetor adjustment screws, that limit the adjustment

possibilities to a maximum of a 1/2 turn.

Your RedMax product has been designed and

manufactured to speciﬁcations that reduce harmful

emissions.

Function

• The carburetor governs the engine’s speed via the

throttle control. Air and fuel are mixed in the

carburetor. The air/fuel mixture is adjustable. Correct

adjustment is essential to get the best performance

from the machine.

• The satisfactory operation of a catalytic converter

depends, among other factors, on the correct

adjustment of the carburetor. Carefully follow the

instructions below, using a tachometer as an aid.

• The setting of the carburetor means that the engine is

adapted to local conditions, for example, the climate,

altitude, fuel and the type of 2-stroke oil.

• The carburetor has three adjustment controls:

- L = Low speed jet

- H = High speed jet

- T = Idle adjustment screw

• The L and H-jets are used to adjust the supply of fuel

to match the rate that air is admitted, which is

controlled with the throttle. If they are screwed

clockwise the air/fuel ratio becomes leaner (less fuel)

and if they are turned anti-clockwise the ratio

becomes richer (more fuel).

• The T-screw regulates the throttle setting at idle

speed. If the T-screw is turned clockwise this gives a

higher idle speed; turning it anti-clockwise gives a

lower idle speed.

Basic settings and running in

The basic carburetor settings are adjusted during testing

at the factory. Avoid running at a too high speed for

extended periods during the ﬁrst 10 hours.

CAUTION! If the chain rotates while idling the T-screw

must be turned anti-clockwise until the chain stops.

Rec. idle speed: 2700 rpm

Fine adjustment

When the machine has been ”run-in” the carburetor

should be ﬁnely adjusted.

The ﬁne adjustment should

be carried out by a qualiﬁed person.

First adjust the L-

jet, then the idling screw T and then the H-jet.

Conditions

• Before any adjustments are made, make sure the air

ﬁlter and spark arrestor screen are clean (if not,

replace them) and the cylinder cover ﬁtted. Adjusting

the carburettor while a dirty air ﬁlter is in use will result

in a leaner mixture next time the ﬁlter is cleaned. This

can give rise to serious engine damage.

• Do not attempt to adjust the L and H jets beyond

either stop as this could cause damage.

• Make sure the bar and chain are properly adjusted.

• Now start the machine according to the starting

instructions and let it warm up for 10 minutes.

• Place the machine on a ﬂat surface so that the bar

points away from you and so that the bar and chain do

not come into contact with the surface or other

objects.

Low speed jet L

Turn the high speed jet H counterclockwise to stop. Then

turn low speed jet L midway between full clockwise stop

and full counterclockwise stop.

Adjusting the idle speed

• Start engine, turn idle speed adjustment screw

clockwise until the chain starts to rotate, then turn

screw out counterclockwise until the the chain stops.

Turn screw out counterclockwise an additional 1/4 turn.

• Accelerate to full throttle for 2-3 seconds to clear any

excess fuel in the engine, then return to idle.

Accelerate engine to full throttle to check for smooth

transition from idle to high speed. If engine hesitates,

turn low speed jet L counterclockwise 1/8 turn and

repeat acceleration. Continue adjustment until

smooth acceleration results.

• Check idle speed and reset if necessary as descibed

above. If a tachometer is available, idle speed should

be set to 2700 rpm.

CAUTION! The idle speed adjuster screw should be

adjusted to not rotate the chain when starting the

machine. Correst idle speed is adjusted to 2700 rpm.

Contact your servicing dealer when you experience

trouble with the carburetor.

IMPORTANT! Any maintenance other than that

described in this manual must be carried out by your

servicing dealer (retailer).

1/2

WARNING! Contact your servicing

dealer, if the idle speed setting cannot be

adjusted so that the chain stops at idle.

Do not use the chain saw until it has

been properly adjusted or repaired.

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RedMax G5300 Operator's Manual Page 30

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