ENGINE ADJUSTMENTS
·
Always make high- and low-speed needle adjustments with the engine shut off.
Also make sure the ignition is OFF.
·
Adjust the needle marked “H” for high-speed Rpm. Adjust the needle marked “L”
for low-speed Rpm.
A. Normal high- and low-speed needle settings:
It is not necessary to change the needle settings if the engine runs smoothly.
Normally only the “H” needle will need adjustment from time to time and only by
a small amount.
H:
Open the needle 3/4 of a turn from the closed position (±1/4 of a turn in winter).
L:
Open the needle 1-3/8 turns from the closed position (±1/4 of a turn in winter).
Only adjust the high- and low-speed needle within the above range.
B. Idle adjustment:
Note:
Do not confuse the idle screw with the low-speed needle “L”. The idle screw
physically adjusts how much the carburetor valve can close. The low-speed needle
“L” adjusts the gasoline to air mixture when the engine is running at low rpm. If your
engine appears to work correctly except that the low rpm are not as low as you
want them to be, then adjust the idle screw. If your engine behaves erratically at
low rpm, then adjust the low-speed needle “L”. When adjusting, turn the screw
about 1/8 of a turn each time. A dirty plug will make it difficult to adjust the idle Rpm.
Follow the recommended procedures if any of the following happens:
Problem:
1.
The engine hesitates when accelerated rapidly.
2.
The Rpm increases at idling.
3.
The engine stops when the throttle is moved from high to low.
Solution:
Your low-speed needle “L” is too lean. Open it up about 1/8 turn and try again.
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