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ADJUSTING THE CARBURETOR

a. Idle adjustment screw: To set the carburetor idle (smaller needle sticking out from the

carburetor body), you can remove the lower body or just insert a 0.5mm/1/8inch Flat-head

screwdriver from the opened front end to turn the screw as pictured. Initial idle setting should

leave 1mm carburetor gap. Clockwise turn will provide higher idle (larger carburetor opening),

and counterclockwise turn will provide lower idle (smaller carburetor opening).

b. High speed needle valve: Insert a 0.5mm/1/8inch Flat-head screwdriver into the adjusting hole

on the right side of lower carb body. To set the high speed needle (large needle sticking out from

the carburetor body), turn the screw as pictured. Initial high speed needle setting should be 2.5

turns (close the needle completely, then back out 2.5 turns). Clockwise turn will provide leaner

setting (lower fuel to air mixture), and counterclockwise turn will provide richer setting (higher

fuel to air mixture). Please refer to ENGINE BREAK-IN/SETTING procedures to properly set the

engine.

c. Low speed needle: Remove the upper car body. To set the low speed needle (The low-speed

mixture screw is located in the end of the carburetor).turn the screw as pictured. Initial low speed

needle setting should be 6 1/2 turns (close the needle completely, then back out 6.5 turns). This

screw controls how much fuel enters the engine at idle and low throttle. This adjustment will

smooth the idle and improve the acceleration to mid speed. Make this adjustment with the

throttle closed, after setting the idle. Turn the screw clockwise gently until it stops. DO NOT over

tighten.

d. Air filter set up: This model is provided with a foam air filter. It is recommended that a few drops

of oil be applied to the foam to ensure no dust can get into the carburetor. However, too much oil

will reduce the airflow into the carb and affect the engines performance. Ensure the air filter is

sercurely in place by fixing it in place with a small 'zip tie' at the base of the rubber mount.

THUNDER TIGER 999R User Manual

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