MTM 58SX Скачать руководство пользователя страница 30

Страница: 30 / 36

Petrol Powered Chainsaws

E&OE

The adjustment screws are generally located
on the starter cord side of the unit. The high
speed and low speed mixture screws are
generally marked "L" and "H", respectively. In
the adjacent image, idle speed is (

), low

speed mixture is (

) and high speed mixture

is (

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.

•

Low Speed Mixture

– Approximately 2.5

turn 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 on 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 saw chain
rotates when the throttle is released. If the saw will not idle, adjust low speed mixture (step 3).

Adjust Low Speed Mixture

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

(right / clockwise) to lean the low speed mixture; rotate "OUT" (left / anti-clockwise) to richen low speed
mixture. Rotate the screw IN until the engine begins surging or wants to stop

– this is the lean

adjustment position. Make a note of the number of rotations of the screw to reach the lean adjustment
position. Then, rotate the adjustment screw OUT

– the engine should start running better. Keep rotating

the screw OUT until the engine starts to load up

– this is the rich adjustment position. Make a note of the

number of rotations of the screw to reach the rich adjustment position and compare it to the lean
adjustment position. Then, rotate the screw IN to a position where the engine idles best

– it should be

about midway between the rich and lean position settings. At this point, you may have to re-adjust idle
speed (step 2).

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.

MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM MTM