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Here is the Adjustment instructions for the TSX carburator as per an old JD service bulletin. Hope it helps. Set the stop screw so that the throttle valve is open slightly Set the throttle to slow idle position. Turn idle adjusting needle until engine begins to falter or roll from richness. then turn needle in the oppisite direction until the engine runs smoothly. TSX modle carbs 107, 330, 339, 355, 385, 398 use the fuel adjusting type of idle needle. All other TSX carbs use the air adjusting type needle. Idle adjusting Needle - Air (top)
To richen the idle mixture turn the idle adjusting needle to the right or clockwise. Idle adjusting Needle - Fuel (top)
To richen the idle mixture turn the idle adjusting needle to the left or counter-clockwise. Power or Load Adjustment (bottom)
With the engine running at governed apeed under load, turn the power adjusting needle to the right (CW) a little at a time until the power drops appreciably. Then turn the needle to the left (CCW) until the engine picks up power and runs smooth.
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