Briggs & Stratton 250000 Specifiche Pagina 76

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3
NOTE: SPECIFICATION TABLES BEGIN ON PAGE 63 OF THIS SECTION.
38
Final Adjustment
1. Start and run engine at half throttle for five minutes
to bring engine up to operating temperature.
2. Place governor speed control lever in “FAST”
position.
3. Turn needle valve in until engine misses
(clockwise – lean mixture) then turn it out past
smooth operation point until engine runs unevenly
(counterclockwise – rich mixture).
4. Turn needle valve to midpoint between rich and
lean so engine runs smoothly.
Final Adjustment, except Low Emissions Carburetors
1. Place equipment control lever in “SLOW” position.
2. Turn needle valve in until engine slows (clock-
wise – lean mixture).
3. Turn needle valve out past smooth operating point
until engine runs unevenly (rich mixture).
4. Turn needle valve to midpoint between rich and
lean so engine runs smoothly.
5. Adjust idle RPM. Rotate throttle shaft
counterclockwise and hold against idle stop while
adjusting idle speed adjusting screw to obtain
1750 RPM.
6. Hold throttle shaft in the idle position. Move speed
control to fast position.
7. Release throttle shaft. Engine should accelerate
without hesitation or sputtering.
8. If engine does not accelerate smoothly, carburetor
should be readjusted, usually to a slightly richer
mixture.
Final Adjustment, Low Emissions Carburetors (with Type Numbers ending in A1 through A9 or E1
through E9)
1. Start and run engine for five minutes to warm up
engine before making final adjustments.
2. Place speed control in slow position.
3. Adjust idle RPM. Rotate throttle counterclockwise
and hold against the idle stop while adjusting idle
speed adjusting screw to obtain 1500 RPM.
NOTE:Current production carburetors have a
pilot jet. These can be identified by not
having an idle mixture needle spring.
4. Release throttle and bend governed idle bracket
(1) to obtain 1750 RPM, Fig. 94.
Fig. 94
1
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