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26 Cards in this Set
- Front
- Back
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State the proper proportions of gasoline to air needed for good combustion |
15 to 1 |
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explain what a venture is and its effect on air pressure |
Constricts in the air passage through the carb which causes an increase in the velocity as the air moves through the narrow areas at the same time there is a pressure drop or vacuume formed in the venture
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explain how the float level is adjusted |
bending the tang on the float |
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explain how the float level will affect the air fuel ratio |
high float level is too rich low float level is too lean |
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explain the purpose of the air bleed in the main nozzle |
Air bleed allows air to mix with the fuel in the main nozzle before it enters the air stream in the venture which helps the fuel to atomize into a very fine mist |
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describe function of a governor system |
regulate carb throttle value to achieve the engine speed desired by the operatior |
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give 3 purposes for having governors on small gasoline engines |
protects engines ensure blade speed provide operating convenience |
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governor sag |
temporary reduction of engine speed when load is increased |
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what should be done when an engine is hunting or surging |
adjust carb adjust the governor linkage remove binding links rebuild carb
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2 types of governors |
mechanical air vane-pneumatic |
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maintain speed |
governor |
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spring and _to maintain constant speed |
counter weight |
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purpose of carb float to regulate |
fuel level |
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basic purpose of a carb is to |
regulate the mixture of air and fuel |
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choke |
regulates air flow |
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changing speed governor adjust |
throttle opening |
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dirty air filter caused |
richer air fuel mixture |
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the governor_tends to open the throttle |
spring |
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governor speed maybe varied by |
changing spring tension |
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what 2 forces must be balanced to governor speed with air vane |
air pressure spring tension |
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Initial carb adjustment |
high speed mixture |
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fuel in the carb venturi area is |
atomized |
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Idle speed is adjusted by turning |
throttle stop screw |
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engine surges when running cause could be |
all of the above |
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when testing the engine In full load and the engine tends to stall or die out |
both A and B |
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done |
done |
