The most common causes when an engine running rich are check engine light, black smoke from the exhaust, high fuel consumption, poor engine performance, and sooty spark plugs. an advantage of the weber carburetor is its ease of adjustment and tuning. The electric choke is connected to the fast idle cam and screw. But I did a bit of reading on the QFT site. My Carburetor Setup Understanding Step 1. Remove float cover, lift out float, and shake it. This symptom of a lean or rich condition is quite common on any carburetor, however, those that have the new Amal Premier … At WOT it is running rich (around 10-12) too. Please help, walk me through some tests or steps or something, i'm lost. Running rich is usually not an issue. RUNNING RICH, Cannot Adjust To Lean - CB-119. Set and verify your timing. At the recommendation of other members on the forum I set it at 12 degrees initial. Keep it running and record the actual RPM rise, whatever it is. Before you panic you need to know and understand a few things before you throw in the towel.. Is it likely just a easy float level adjustment that I have to make? To get the best fuel efficiency, as well as power, the carburetor on your Honda engine needs to be adjusted to provide the optimum performance. shouldnt … 7 Common Engine Running Rich Symptoms. If you think that your engine is running with a rich mixture, there are some things you should check to confirm this. So you purchased a new Amal Premier carburetor and noticed that your classic motorcycle is running too rich or too lean on the pilot circuit. The size and type of a Stromberg are given by numbers and letters. start set up by confirming carb … So how can one actually tell that a carb is running rich? There may be a time when your engine runs rich and the carburetor cannot be adjusted to the lean side. In order to optimize the fuel/air mixture on your Mustang’s carburetor, you need to correctly adjust the idle mixture screws to make the mix leaner or richer. The symptoms of running too rich or too lean are easy to see. BTW - the idle mixture setting will never cause a motor damage. I don't have my carb manual here (away at school). … If your lean-out gave more than a 50-RPM rise, your carburetor (or fuel injection—the same test applies) is set too rich and needs to be compensated in the lean direction. Fixed carb jets can get clogged and cause this condition. poor running quality does not mean a defect in the carburetor. Due to weather conditions and use, the carburetor adjustments can change, requiring them to be readjusted. Adjust the choke open/close duration by rotating the electric choke housing. Step 2. The two work in much the same way, but the Stromberg differs in having an air valve - commonly called the piston - surrounded by a rubber diaphragm in the dashpot. The Stromberg CD carburettor, like the SU (See Adjusting an SU carburettor), is a constant-depression carburettor, hence the CD. Learn all you need to know about idle mixture screw adjustment. Re: How to tell if running lean, or rich? calibrations may vary due to regional fuels and state of engine tune and performance. Conversely, if you saw little or no RPM rise, your idle mixture is set too lean. read what d hearne said .. the screws on the side of the metering blocks are the idle adjustment screws which only effect the idle mixture .. you want to get them adjsuted to put out maximum vacuum at a given idle rpm or to maintain the highest rpm once warmed up .. that means they are adjusted properly, then adjust the idle speed to speed or slow it down. Leaky floats: Check the floats first. set up adjustments . Eric, Running lean will cause heat and can cause damage. Cold Start Adjustment. 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