Bolens 140-830A - Manual (Page 17)

'Clean Area of.
All Dirt and Debris
FIGURE 28.
Carburetor Adjustments
^ WARNING {
If any adjustments are made to the
engine while the engine is running
(e.g. carburetor), disengage all clut­
ches and blades. Keep clear of all
moving parts. Be careful of heated
surfaces and muffler.
Now open needle valve IV 2 turns counterclock­
wise. Close idle valve in same manner and open
1 V 2 turns. This initial adjustment will permit the
engine to be started and warmed up prior to final
adjustment (See figure 29.)
Final Adjustment
Place governor speed control lever in “IDLE” posi­
tion. Hold throttle lever against idle stop and set
idle speed adjusting screw to obtain 1400 R.P.M.
Turn idle valve slowly clockwise (lean mixture) un­
til engine misses or R.P.M. slows. Then turn idle
valve
Vz turn counterclockwise.
Hold throttle shaft in closed position and adjust
idle speed screw to 900 R.P.M. Release the throt­
tle. With remote control in idle position, adjust tab
“A” to obtain 1400 R.P.M.
NOTE
Governed idle must be adjusted on
all engines for proper operation. The
smaller spring keeps the engine on
governor, even at idle speed. If
moderate loads are applied at idle,
the engine will not stall. Idle speed
should be no lowerthan 1100 R.P.M.
Minor carburetor adjustments may be required to
compensate for differences in fuel, temperature,
altitude and load.
To Adjust Carburetor—Turn
clockwise until it just closes.
needle valve
A
CAUTION
Valve may be damaged by turning it
in too far.
Adjusting Screw
FIGURE 29.
Place governor speed control lever in fast posi­
tion. Then turn needle valve in slowly clockwise
(lean) until engine misses or R.P.M. slows. Then
turn needle valve V
2 turn counterclockwise.
If engine does not accelerate properly, readjust
needle valve approximately 1/8 turn counterclock­
wise (richer). (See figure 30.)
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