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Walbro Fixed Jet
KT17 1-1/4 turns
KT19 1-1/4 turns
Low Idle
Walbro Adjustable Jet
Low Idle Main Fuel
KT17 1-1/4 turns 1-1/4 turns
KT19 1-1/4 turns 1 turn
3. Start the engine and run at half throttle for five to
ten minutes to warm up. The engine must be
warm before making final settings.
4. Main Fuel Needle Setting: This adjustment is
required only for adjustable main jet carburetors. If
the carburetor is a fixed main jet type, disregard
this setting.
Place the throttle into the "fast" position.
Turn the adjusting needle in (clockwise). The
engine speed may increase, then it will decrease
as the needle is turned in (lean). Note the position
of the needle. Back the needle out approximately
1/4 turn. See Figure 11 below for best main fuel
performance.
Figure 11. Optimum Main Fuel Setting.
5. Low Idle Speed Setting: Place the throttle control
into the "idle" or "slow" position. Set the low idle
speed to 1200 RPM* (± 75 RPM) by turning the
low idle speed adjusting screw in or out. Check
the speed using a tachometer.
*NOTE: The actual low idle speed depends on the
application. Refer to the equipment
manufacturer's instructions for specific
low idle speed settings. To ensure best
results when setting the low idle fuel
needle, the low idle speed must not
exceed 1500 RPM.
6. Low Idle Fuel Needle Setting: Place the throttle
into the "idle" or "slow" position.
Turn the adjusting needle in (clockwise). The
engine speed may increase, then it will decrease
as the needle is turned in (lean). Note the position
of the needle.
Back the needle out approximately 1/8 to 1/4 turn.
See Figure 12 below for best low idle fuel
performance.
Figure 12. Optimum Low Idle Fuel Setting.
Back Out Approx.
1/8 to 1/4 Turn
Lean Lean
Back Out Approx.
1/8 to 1/4 Turn
Lean Lean