Gh0stRider
New Member
Do the Gh0stRider aquarium pump mod!
There are no air/fuel adjustment screws on carburetors.
Either it is an air adjustment screw, or a fuel adjustment screw. Air adjustment screws are generally on the air cleaner side of the carburetor, and fuel adjustment screws are generally on the engine side of the carburetor.
I have personally done the modification to my generic chinese engine as it was running too rich at idle and loading up the engine with fuel. Moving the needle lower would fix the idle but cause an overly lean condition at mid throttle. Adding the air bleed worked well, but you have to go back and forth on the idle speed and air bleed screws to get it balanced perfectly.
Go to a pet store and buy an air regulator valve and an inline air filter and hook it up to the intake tube with a brass barb obtained at a hardware store. Drill and tap a hole in the intake tube and screw in the brass barb. (I sealed mine with high temp PC7 epoxy)
an intake leak would cause the engine to run lean, even if it was made by using an adjustable screw of some sort. A mixture screw does just what it's called...it allows you to adjust the air/FUEL mixture at the carb. an adjustable screw in the intake would only allow you to adjust the air and it will always run too lean if it is sucking extra air anywhere after the carb.
you will always get more power / shorter piston life out of an engine that is running too lean.
There are no air/fuel adjustment screws on carburetors.
Either it is an air adjustment screw, or a fuel adjustment screw. Air adjustment screws are generally on the air cleaner side of the carburetor, and fuel adjustment screws are generally on the engine side of the carburetor.
I have personally done the modification to my generic chinese engine as it was running too rich at idle and loading up the engine with fuel. Moving the needle lower would fix the idle but cause an overly lean condition at mid throttle. Adding the air bleed worked well, but you have to go back and forth on the idle speed and air bleed screws to get it balanced perfectly.
Go to a pet store and buy an air regulator valve and an inline air filter and hook it up to the intake tube with a brass barb obtained at a hardware store. Drill and tap a hole in the intake tube and screw in the brass barb. (I sealed mine with high temp PC7 epoxy)