THUNDER TIGER TOMAHAWK BX Instruction Manual page 15

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ENGINE BREAK-IN SIE ES
For a new engine (break-in setting), the high speed needle needs to be set as rich as possible. Turn the high speed needle 1/4 turn
counterclockwise from initial setting (3~3.5 turns from fully closed). Repeat step 15b. Keep doing this until the engine stalls at full
throttle, then turn the high speed needle 1/4 turn clockwise. Run the car in an open parking lot with this rich engine setting for at least
5 tanks of fuel to complete the break-in process. It is normal for new engines to stall many times during this time due to the rich setting.
When it does, just restart the engine. After break-in, follow the engine setting procedure to set the carburetor for normal operations.
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ENGINE SETTING 5|S€EP 3E
Due to different fuel formula, operating elevation, humidity . . . etc. The engine may / may not operate properly at initial setting. Please
follow the following procedure to achieve proper carburetor setting. Do not perform this procedure until the engine has been properly
broken in.
. Start the engine.
b. With a running engine, run the car back and foreth in a straight line (full throttle achieved during each passage) in an open parking
lot. Repeat, and note the sound of the exhaust. Do not hold the throttle open with car off the ground or the engine connect rod
may break.
. If the exhaust does not reach a high pitch note, turn the high speed needle (long needle, extending from carburetor, pointing up)
1/4 turn clockwise, and repeat step 18b.
If the exhaust reaches a high pitch note immediately, turn the high speed needle 1/4 turn counterclockwise, and repeat step 18b.
. Repeat step 18c until the engine reaches optimum setting (turning in the high speed needle will no longer have an effect at full
throttle and turning out the needle will cause the engine's full throttle rpm to drop a little).
For normal operations, turn the high speed needle 1/4 turn counterclockwise from the optimum high speed needle setting.
. To set the idle, turn the idle screw in (higher rpm) or out (lower rpm).
Basically, the idle needs to be set at the lowest possible point before the engine stalls.
. Tosetthe low speed needle (larger needle on the side of carburetor body), the engine needs to be broken-in and high speed needle
needs to be set first.
. Repeating step 18b every 10 seconds (1 second of full throttle and 10 seconds of idle). If the engine rpm at idle drops after a few
seconds and stalls, then turn in the low speed needle (clockwise) 1/4 turn. If the engine rpm stays the same or goes up at idle,
then turn out the low speed needle (counterclockwise) 1/4 turn.
. Keep repeating step 18g until the engine rpm drops (goes to idle rpm, then drops a few more rpm after a few seconds) but does
not stall at idle.
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