Maintenance - RedMax BCZ350S Manual De Instrucciones

8. Maintenance

■ Carburettor
Your RedMax product has been designed and manufactured to
specifications that reduce harmful exhaust fumes. The engine will
be run in after it has used 8-10 tanks of fuel. To ensure that the
engine runs at peak performance and produces as little harmful
exhaust fumes as possible after the running-in period, ask your
dealer/service workshop (which has a rev counter for this
purpose) to adjust your carburettor.
1. Function
• The carburettor governs the engine's speed via the throttle
control. Air and fuel are mixed in the carburettor. The air/fuel
mixture is adjustable. Correct adjustment is essential to get the
best performance from the machine.
• Adjusting the carburettor means that the engine is adapted to
local operating conditions, e.g. climate, altitude, petrol and the
type of 2-stroke oil.
• The carburettor 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). A lean mixture gives a higher
engine speed and a rich mixture gives a lower engine speed.
• 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.
2. Basic setting
• The basic carburettor settings are adjusted during testing at the
factory. The basic setting is richer than the optimal setting and
should be maintained for the first few hours the machine is in
use. The carburettor should then be finely adjusted. Fine
adjustment should be carried out by a skilled technician.
CAUTION! If the cutting attachment rotates when the engine is
idling the idle adjustment screw T should be turned anti-clockwise
until the cutting attachment stops.
3. Adjustment of the idle speed
Before any adjustments are made, make sure that the air filter is
clean and the air filter cover is fitted.
L
H
T
Adjust the idle speed using the idle adjustment screw T, if it is
necessary to readjust. First turn the idle adjustment screw T
clockwise until the cutting attachment starts to rotate. Then turn
the screw anticlockwise until the cutting attachment stops. The
idle speed is correctly adjusted when the engine will run smoothly
in every position. The idle speed should also be well below the
speed at which the cutting attachment starts to rotate.
T
Rec. idle speed: See the Technical data section.
WARNING
If the idle speed cannot be adjusted so that the cutting
attachment stops, contact your dealer/service workshop. Do
not use the machine until it has been correctly adjusted or
repaired.
■ Muffler
CAUTION! Some mufflers are fitted with a catalytic converter. See
chapter on Technical data to see whether your machine is fitted
with a catalytic converter.
The muffler is designed to reduce the noise level and to direct the
exhaust gases away from the operator. The
exhaust gases are hot and can contain sparks, which may
cause fire if directed against dry and combustible
material.
BCZ350S
U
S
US-23