Baumr BCX720 User Manual Download Page 45

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Petrol Powered Pole Tools

E&OE

engine may reach speeds where bearing failure and piston seizure are possible. It will also lack power

and tend to run very hot.

The idle speed screw (

) and high speed mixture screw (

)

are accessed from the rear of the engine.

Factory Settings

Each adjustment screw has a general "factory setting",

which is measured from the adjustment screw being rotated

"IN" (right / clockwise) until fully seated (but not tight). From

this point, the setting is made by counting the number of full

rotations of the screw "OUT" (rotate left / anti-clockwise).

Factory settings are:

•

Idle Speed

– Approximately 5 turns out.

•

High Speed Mixture

– Approximately 2 turns out.

Use the factory settings as the basis for tuning. Set all

adjustment screws to factory settings, then test the engine

before further tuning. Use a suitable flat-blade screwdriver

and ensure that the screwdriver is properly engaged with the adjustment screw before rotating.

Tuning

1. Start and allow the engine to idle until it is warmed up – tuning a cold engine will result in rich running

when the engine is warm. If the engine does not idle, use the throttle to keep the engine running ("blip"

the throttle; do not run the engine continuously at high speed).

Adjust Idle Speed

– Rotate the adjustment screw one quarter (¼) turn at a time – rotate "IN" (right /

clockwise) to increase idle speed; rotate "OUT" (left / anti-clockwise) to reduce idle speed. Set the speed

so the engine idles as fast as possible without engaging the clutch. Never set the idle so the cutter

attachment rotates when the throttle is released. If the engine will not idle, adjust the high speed mixture

(step 3).

Adjust High Speed Mixture

– Rotate the adjustment screw one quarter (¼) turn at a time – rotate "IN"

(right / clockwise) to lean the high speed mixture; rotate "OUT" (left / anti-clockwise) to richen high speed

mixture. Rotate the screw OUT until the engine begins slowing and running roughly at full throttle. Then,

rotate the adjustment screw IN – the engine should start running better. Keep rotating the screw IN until

the engine reaches maximum speed. Then, rotate the screw OUT one eighth (1/8) to one quarter (¼) of

a turn to richen the air/fuel mixture for engine cooling purposes.

4-Stroke Engine

Basic tuning for 4-stroke engines by owners is limited

to idle speed only. If the engine requires more

complex tuning, take it to an authorised service

centre.

Carburettor Adjustments

The carburettor has 1 adjustment available:

•

Idle Speed

– Controls how open the throttle is

when released. If idle speed is too low, the

engine may stop when the throttle is released

due to a lack of air/fuel mixture. If idle speed is

too high, the engine may idle at a speed that

engages the clutch and cause the cutting

attachment to rotate – this is a dangerous

condition that should never be allowed.

The idle speed screw (

) is accessed from the rear of the engine.

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