How do you attach a CV carb to a Shovelhead?
The best way to do an installation of a CV on the Shovelhead is to either make or purchase a flange that will press directly onto the rear of the carb. This mount will have the two studs on it that pass into the manifold.
Is CV carburetor good?
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. the CV carb allows much more precise metering and thus, a less boggy engine under load conditions.
How do you adjust a fuel mixture screw?
Turn the screw clockwise until the engine starts to sound rough.
- Tightening the screw weakens the air and fuel mixture and decreases the amount of fuel flowing to the engine.
- Tightening the screw is also called making the fuel mixture leaner, which lowers the RPMs at which the engine idles.
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.
How do I make my carb run leaner?
The first thing to do is not set up the idle speed, but to set the Idle mixture screw to lean best idle setting. First, turn in the mixture screw until the engine dies or runs worse, then back out the screw (recommend turning ¼ to ½ turn at a time). The engine should pick up speed and begin to smooth out.
Can You mount a CV on a Shovelhead carb?
The mounts are generally from Mikuni. They are OK but they tend to rot and crack after a while. The best way to do an installation of a CV on the Shovelhead is to either make or purchase a flange that will press directly onto the rear of the carb. This mount will have the two studs on it that pass into the manifold.
What is a CV carburetor and how does it work?
Harley Davidson started equipping models with the CV carburetor in 1989 and has utilized the same carb ever since. A CV carburetor (Constant Velocity) incorporates a vacuum operated slide that varies the venturi size within the carburetor, thus maintaining a constant velocity.
What is the best carburetor for a shovel?
Of all the aftermarket carbs out there the S&S E seems to be the best for most shovels. When it comes to the stock cylinder heads, they are very poor castings untill around 1980. The casting cores and machining on the old heads can vary widely even within a factory pair.
Which Mid Jet for a Shovelhead CV conversion?
I’ve found after much experimentation that the best mid jet for a Shovelhead CV conversion is a #50. I have tried a 48 and had the exact same spitting. It’s caused by a slightly lean condition.