Adjusting Carburettor - Echo HCR-1510 Service Data

9
SERVICE INFORMATION
HCR-1510

2-3 Adjusting carburettor

1. Start engine and warm it up well for about 3 - 5
minutes with cycle of 5 seconds at WOT (Wide Open
Throttle) and 10 seconds at idling.
2. Adjust L mixture needle and obtain maximum idle
speed with 2.5 mm wide blade head screw driver
(D).
3. Set idle speed to 3,800 r/min by turning idle adjust
screw.
4. Turn L mixture needle anticlockwise to reduce
idle speed 1,000 r/min to set idle speed in the range
of 2,600 to 3,000 r/min.
D
NOTE : Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment of
L mixture needle to assure accurate tachometer
readings.
5. Turn H mixture needle clockwise to maximum
WOT engine speed then turn the H mixture needle
clockwise further until engine speed drops 100 to
200 r/min.
6. Immediately return the H mixture needle
anticlockwise to obtain maximum WOT engine
speed with smooth and clear engine sound. Then
turn the H mixture needle anticlockwise 1/8-1/4 turn
further.
7. After adjusting carburettor, install Red limiter cap
on H mixture needle and White limiter cap on L
mixture needle to the rich side stop as shown.
NOTE : Before installing limiter caps, warm caps in
90 °C hot water for smooth installation. Make it sure
to use pliers or appropriate instrument to take
warmed up cap out from the water.
(Continued)