slight adjustment of the carburetor may be necessary.
Engine Functions and Adjustments
1. Choke Control (the choke control should be used when the engine is cold)
2. Throttle
3. Idle Adjustment Screw (adjust the idle speed)
4. (L) Low-speed Needle (adjusts the fuel/air mixture at low speeds)
5. (H) High-speed Needle (adjusts the fuel/air mixture at high speeds)
Idle Adjustment
Turning the Idle Adjustment Screw clockwise will increase the idle speed. Turning the Idle
Screw counter-clockwise will decrease the idle speed.
Low Speed Needle Adjustment
Turning the Low-speed Needle clockwise will lean the fuel/air mixture at low speeds.
Turning the Low-speed Needle counter- clockwise will richen the fuel/air mixture at low
speeds. (The default or factory setting of the Low-speed Needle is as follows: turn the
needle to the fully stop/closed position and then turn back 2.5 turns.)
High Speed Needle Adjustment
Turning the High-speed Needle clockwise will lean the fuel/ air mixture at high speeds.
Turning the low-speed Needle counter-clockwise will richen the fuel/air mixture at high
speeds. (The default or factory setting of the High-speed Needle is as follows: turn the
needle to the fully stop/closed position and then open the needle 3 turns). It is
recommended that the High-speed needle be adjusted by the use of a tachometer to
obtain maximum speed. Smooth acceleration and deceleration is an indicator of proper
engine performance.
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