what exactly happens to the engine when I put the engin on choke? some of my friends say that the engin floods with fuel. what is the exact mechanism for this?
2006-09-12 01:34:30 · 7 answers · asked by cluless1666 1 in Cars & Transportation ➔ Motorcycles
It depends on what type of choke is on the carburator.
If it's a hand opperated lever -
-A butterfly valve blocks the ventrui of the carburator. Restricting the air going into the motor. Changing the fuel-air mixture, to a more fuel mixture, which explodes easier when the spark plug ignites it.
The top picture is a butterfly valve in the closed (choke) position.
The bottom picture is the venturi of the carb (large tunnel going through the carb, from the engine to the air box).
http://auto.howstuffworks.com/question377.htm
If you watch the video, the throttle plate is being opperated and works in the oppisite manner as the choke does - Close the plate and less fuel/air goes into the motor. Open it and more fuel/air.
Another type of choke gets pulled out of the carb. By hand, or a cable opperated from a lever on the handle bar. This type of choke uses a needle valve. When the valve is pulled out, the choke pick-up tube is un-blocked (the pick-up tube gets fuel from the float bowl). When this circuit is un-blocked, more fuel gets into the fuel/air mixture. Making it more volitile to ignite easier.
The last type of choke is electric. It works just like the needle valve choke. The valve is pulled out & pushed back in, by a temperature sensor in the choke mecanisim. The valve starts in the open position. When the sensor starts to heat up, the electrical current slowly pushes the needel valve in, blocking the choke circuit. Making the fuel/air mixture back to normal.
Sorry about the length. I wanted to explain how the choke works, so you'd understand.
2006-09-12 03:42:12 · answer #1 · answered by guardrailjim 7 · 2⤊ 0⤋
The choke lever adjusts the fuel/ air mixture to help start the engine when its cold. The mechanism literally closes the carburator air opening where large amount of air usually mixes with a little fuel. You will not find a choke on a fuel injected bike.
2006-09-12 02:03:37 · answer #2 · answered by acavlov 2 · 0⤊ 0⤋
It's not so much a switch as a progressive lever.
As you push it further, it closes a butterfly flap inside the tube ("venturi") of the carburettor, reducing the air-flow through it. This means that a higher amount of petrol is drawn into the engine, to make it easier to start and run whilst the engine is cold. Don't forget to return it to the un-choked position as soon as the engine runs well, as otherwise you will have very heavy fuel consumption, and poor performance, as the engine cannot "breathe" well when choked.
2006-09-12 01:46:14 · answer #3 · answered by millowner87 2 · 0⤊ 0⤋
The choke switch helps start the motor,you can kill the engine by pulling out the choke, the motor does flood when you pull the choke. That's why most cars have automatic chokes built in the carb,when it warms up it hicks off.Its just a fast way to start your engine..are something like that..
2006-09-12 02:37:34 · answer #4 · answered by D Grass 3 · 0⤊ 1⤋
The choke button on a motorcycle carburetor is actually an enricher circuit inside the carburetor. It opens a passage and allows extra fuel into the intake tract.
2006-09-12 01:55:11 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Choke cuts off the air.
2006-09-12 01:39:50 · answer #6 · answered by Nerdly Stud 5 · 0⤊ 0⤋
it shuts the air off read the manual before u ride so u know what to do and expect
2006-09-12 01:43:46 · answer #7 · answered by uofsmike 4 · 0⤊ 0⤋