When to turn the choke on a carb engine?
The only time a carb engine doesnt need the choke is after it has already been warmed up. Once warm you can just turn the key without having to touch the throttle.
What causes a choke to stay on fast idle too long?
Stays on fast idle too long: The choke spring tension is too tight, the heat source is not being supplied or is blocked, or the fast-idle cam is gummed up, bent or has another problem that does not allow it to drop.
What happens to choke spring when engine is shut off?
As the engine warms up, the spring tension is reduced until the butterfly is completely open and has no impact on the signal the carburetor venturi (booster) is exposed to. When a hot engine is shut off and starts to cool, the tension on the choke spring increases in lockstep with the drop in temperature.
Why do you not pump the throttle when cranking the engine?
When cranking the engine, you do not want to “pump” the throttle, since this will decrease the signal to the booster and limit or stop fuel flow. If the engine does not start when cranked over for a few seconds, release the key and press the accelerator to the floor one more time to evoke an additional accelerator pump shot.
Where is the choke and throttle cable located?
Insert the control cable bowden wire in the proper hole of the engine control lever, which is located on the side of the carburetor air intake elbow.
Stays on fast idle too long: The choke spring tension is too tight, the heat source is not being supplied or is blocked, or the fast-idle cam is gummed up, bent or has another problem that does not allow it to drop.
Can a Mercury 15HP two stroke start?
Once started, it will run and start easy all day. I usually start it at home in a drum, allow it to warm up on choke for 10 minuits, but push the choke in , and it will run 5 seconds and stop, after 5 to 10 mins it is ok. I have always left the carby full, but am now going to try draining it out after use.
As the engine warms up, the spring tension is reduced until the butterfly is completely open and has no impact on the signal the carburetor venturi (booster) is exposed to. When a hot engine is shut off and starts to cool, the tension on the choke spring increases in lockstep with the drop in temperature.