What is constant velocity carburetor?
On CV (constant velocity) carbs – when the throttle is twisted, the cable opens up the butterfly valve, which allows air to be drawn into the mouth of the carb. CV, or Constant Velocity carbs offer the best real-world performance for day to day riding where your throttle isn’t pinned all the time.
How does a constant vacuum carburetor work?
Constant vacuum carburetors, also called variable choke carburetors and constant velocity carburetors, are carburetors where the throttle cable was connected directly to the throttle cable plate. Pulling the cord caused raw gasoline to enter the carburetor, creating a large emission of hydrocarbons.
What does CV stand for in carburetors?
Constant Velocity Carburetors. Carburetors fall into two categories: mechanical slide or constant velocity (CV). In a mechanical slide carburetor, the rider’s throttle input directly raises or lowers the carburetor slide, which regulates how much air flows through the bore and into the engine.
What kind of carburetor does a Honda motorcycle use?
Honda used two basic types of carburetors, CV and slide both made by the Keihin company. The CV type, Constant Velocity or Constant Vacuum, uses pressure to raise the throttle slide where a cable is used in the slide model.
How does a piston constant velocity carburetor work?
Piston Constant Velocity Carburetors have a solid piston and slide. The piston is sealed with a Labyrinth Seal. The engine vacuum raises the slide smoothly as engine vacuum increases. When you close the throttle the slide closes from it’s own weight.
How does a CV carb work on a carb?
On CV (constant velocity) carbs – when the throttle is twisted, the cable opens up the butterfly valve, which allows air to be drawn into the mouth of the carb. You control the butterfly which allows air in, which controls the slides, which controls the air / fuel mixture entering the engine.
Can a Honda Helix carburetor fit a Honda CH250?
The lower the number the leaner the fuel mixture. Jets are available at your local Honda dealer or at rageperformance.com. Also, any Honda Helix carburetor will also fit the Honda CH250. They have about the same dimensions—50mm OD on the air box side, 36mm OD on the engine side and 30mm ID on the engine side.
What kind of carburetor does Honda CH250 use?
The Keihin constant velocity carburetor on your Honda CH250 should perform well with the standard recommended settings under average load, climatic, and barometric conditions. All constant velocity (CV) carburetors are designed to compensate for changes in altitude and barometric pressure.
Piston Constant Velocity Carburetors have a solid piston and slide. The piston is sealed with a Labyrinth Seal. The engine vacuum raises the slide smoothly as engine vacuum increases. When you close the throttle the slide closes from it’s own weight.
On CV (constant velocity) carbs – when the throttle is twisted, the cable opens up the butterfly valve, which allows air to be drawn into the mouth of the carb. You control the butterfly which allows air in, which controls the slides, which controls the air / fuel mixture entering the engine.
Do you need to retune your CV carburetor?
All constant velocity (CV) carburetors are designed to compensate for changes in altitude and barometric pressure. But even a slight modification to increase engine performance will require retuning of your CV carburetor. Air-box modifications or the use of an aftermarket exhaust system may require jetting changes.