Carburettor Adjustment Procedure; General Adjusting Rules; Presetting Idle Adjust Screw, L Mixture Needle And H Mixture Needle - Echo CS-370ES Service Data

CS-370ES

2 CARBURETTOR ADJUSTMENT PROCEDURE

2-1 General adjusting rules

A. Before starting the unit for adjustment, check the following items.
1. The correct spark plug must be clean and properly gapped.
2. The air filter element must be clean and properly installed.
3. The muffler exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel filter 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" 2-
stroke oil.
6. The recommended bar and chain must be installed, and properly tensioned.
NOTE : In order to achieve proper carburettor adjustment, 30 or 35 cm bar and chain should be installed
on the unit. Otherwise serious engine damage will occur due to overspeeding.
B. Set L and H mixture needles full anticlockwise. Start and run engine for two minutes alternating engine
speed between WOT for 5 seconds and idle for 5 seconds. Adjust idle speed screw to 2,700 +/- 150 r/min.
Adjust H mixture needle to 12,000 +/- 500 r/min. If engine does not run correctly after this adjustment,
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.

2-2 Presetting idle adjust screw, L mixture needle and H mixture needle

B
L
A
SERVICE INFORMATION
Parts Required : (2) P/N P003-000010 limiter caps.
1. Turn the L and H mixture needles anticlockwise
to rich side stop to align limiter cap tab (A) with
locating slot (B), using 3 mm blade screwdriver.
NOTE : If cap tabs (A) misalign with locating slots
(B), there is a chance to strip thread.
H
A
B
7
(continued)