AUTOLITE 4100 TROUBLESHOOTING PG2 Black Smoke & Gassy Smell at Idle Check needle & seat for leaking. Use spray carb cleaner and spray through all the small holes in the venturi. Also spray through the corresponding passage that leads down to the idle mixture. Remove idle mixture screw and check…
When the engine is cold the tension of the Thermostatic Choke spring (10) holds the choke piston (2) at the top of its travel and the choke valve completely closed. This supplies the engine with a rich mixture for starting.When the engine starts, the vacuum of the intake manifold acting…
This circuit is used only in starting and warming a motor, its purpose being to supply a rich_ mixture for starting. It consists of choker shaft and lever assembly, choker valve and screws, and a means of controlling the position of the valve. In the manual choke, a wire from…
The intermediate speed and high speed circuit consists of the Metering Rod (M), Metering Jet (N), Nozzle (0), and gasket, Throttle Valve (J), and Metering Rod Spring and Disc.As the throttle is opened wide enough for a speed of a little more than 20 m.p.h., the velocity of the air…
The Idle or Low Speed Circuit completely controls the supply of gasoline to the engine during idle and light-load speeds up to approximately 20 m.p.h. and it partially controls the supply for light-load speeds between 20 and 30 m.p.h.The idle or low speed circuit consists of the low speed jet…
A float with needle and seat automatically controls the inflow of gasoline. The high speed metering jet gives a much more accurate adjustment of the gasoline. The float circuit is important because it controls the height of the gasoline level in the bowl and also in the nozzle. A gasoline…
A weak fuel pump can cause lack of fuel on high end. A fuel pump putting out too much fuel can over fuel the carburetor causing it to flood. Pressure Test Use a suitable fuel pump tester. The tester should be able to test at low pressure such as 4…
The Elastomer Valve (or as we call it Umbrella Check is used to control gas intake to the diaphragm and the discharge. When the throttle is let up, the diaphragm creates a sort of suction which pulls open the Elastomer valve and allows the diaphragm reservoir to fill up. When…
Despite what many may think, carburetors still occupy a special place in the heart of automotive hobbyists. Proof of that is that renowned brands like Edelbrock still invest time and money in launching innovative products like its next-generation AVS2 Series Carburetors in addition to continuing producing legendary carburetors like the…