Adjusting Carburettor; General Adjustment Rules; Initial Setting Throttle Adjust Screw, L Mixture Needle And H Mixture Needle - Echo CS-600 Service Manual

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CS-600

4-6 Adjusting carburettor

A. Before adjustment, check the following items.

1. The correct spark plug must be clean and properly gapped.

2. The air ﬁ lter element must be clean and properly installed.

3. The mufﬂ er exhaust port must be clear of carbon.

4. The fuel lines, tank vent and fuel ﬁ lter are in good condition and clear of debris.

5. The fuel is fresh ( > 89 octane : RON ) and properly mixed at 50 : 1 with "ISO L-EGD" or "JASO FC/

FD" 2-stroke oil.

6. 50 cm bar and chain must be installed, and properly tensioned.

B. Adjustment with limiter caps on carburettor.

Set L and H mixture needles fully anticlockwise. Start and run engine for two minutes alternating engine

speed between WOT for 5 seconds and idle for 5 seconds. Adjust Throttle adjust screw to 2,800 +/- 150

r/min. Adjust H mixture needle to 12,500 +/- 300 r/min. If engine does not run correctly after this adjust-

ment, proceed to the next step 2-2.

IMPORTANT : After adjusting carburettor according to the steps 2-2 and 2-3, the limiter cap(s)

must be installed on L and H mixture needle(s) to comply with Emission Directive.

FUEL SYSTEM

Tools Required : Small screwdriver with 2.5 mm

blade, Tachometer PET-304 P/N G310-000050,

limiter cap removal tool with 2.5 mm left-hand

thread P/N 91019. Parts Required : (2) limiter caps

P/N P003-000010.

1. Turn the L and H mixture needles anticlockwise

to rich side stop to align limiter cap tab (A) with lo-

cating slot (B), using 2.5 mm blade screwdriver.

NOTE : If cap tabs (A) misalign with locating slots

(B), the cap cannot be removed and the centre

hole threads will strip. If centre hole threads strip,

use 3 mm diameter thread wood screw to remove

the limiter cap.

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