KEIHIN Carburetor Work - it's endless!

Smithers · Post by **Smithers** » Mon Feb 28, 2011 10:20 pm

I got it now. It's called the PILOT JET and its connected to a little black rectangle box (some sort of solenoid with a couple wires plugged into it) that then connects to the left side fuel T. The right side fuel T connects to the fuel pump. I don't know how the box controls any type of flow of fuel to or from the pilot jet but I do know that fuel will squirt out of the pilot jet real fast when you are just pumping the throttle engine on or off. It needs to be hooked as it was from the factory or blocked off. I would say that it is important for normal street driving so I'm hooking mine up properly. A generic excerpt from a website that got it from another website: "The pilot air jet forms part of the idle jet system. Air pilot jet is a type of the air metering system or air bleeding system. The air pilot jet regulates the amount of pressurized air drawn into the pilot system. This air pilot jet corrects the air and fuel mixture ratio. It improves fuel atomization, which is the process of turning fuel into gas."

57x · Post by **57x** » Wed Mar 02, 2011 12:41 pm

Smithers wrote:I got it now. It's called the PILOT JET and its connected to a little black rectangle box (some sort of solenoid with a couple wires plugged into it) that then connects to the left side fuel T. The right side fuel T connects to the fuel pump. I don't know how the box controls any type of flow of fuel to or from the pilot jet but I do know that fuel will squirt out of the pilot jet real fast when you are just pumping the throttle engine on or off. It needs to be hooked as it was from the factory or blocked off. I would say that it is important for normal street driving so I'm hooking mine up properly. A generic excerpt from a website that got it from another website: "The pilot air jet forms part of the idle jet system. Air pilot jet is a type of the air metering system or air bleeding system. The air pilot jet regulates the amount of pressurized air drawn into the pilot system. This air pilot jet corrects the air and fuel mixture ratio. It improves fuel atomization, which is the process of turning fuel into gas."

I think you are mixing up a few things here. The pilot jet is inside the carb. You definitely need that. The part that squirt in fuel is the accelerator pump. The part we are discussing cuts off fuel from one of the accelerator pumps below a certain RPM. That is all it's function is, which is why it is hooked up to the CDI to determine the current RPM of the bike.

Smithers · Post by **Smithers** » Wed Mar 02, 2011 12:47 pm

Thanks for the correction and information on how these components work. I was wondering about the definition of a Pilot Jet compared to what the Kawi parts manual shows as "pilot jet" in their exploded parts diagram referring to this carb in particular. They probably have to call it something and they also label it #75 as I assume it does meter the fuel as it it allowed to flow at higher rpms (right? : ). Here is a exploded view I put some part reference numbers on as well. These references are from a website listing all OEM parts for sale for this ZX-7R.

I guess I'll just hook all this stuff up and just make it run.