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Home, Auto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index How to Diagnose and Repair Carburetor Problems by Larry Carley copyright 2019 AA1Car.com. It could also be a timing / advance issue, but most likely it's a problem with the circuit, or system, that dumps extra fuel into the venturi when you twist the throttle. If it is defective, the bowl will either over flow or not allow enough fuel into the bowl. This will change the required length of the choke operating rod, and may result in the choke either not closing, or not fully opening. All the carburetors on this page feature multiple options, so you should have no problem finding a carburetor that fits your motorcycle—even if it is a bit older or less common. Diagnose Motorcycle Carb Issues on the Fly. Motorbike carburetors are no exception. Fortunately, you can take steps to get the carburetor working again temporarily, until you can open up the carburetor and fix the float permanently. Both problems may be caused by a stuck carburetor float. Step 1. When jetting a motorcycle carburetor, it is always best to return the carburetor back to the factory settings per the factory service manual (or equivalent aftermarket publication like Clymer or Haynes). Some carburetors, such as the Quadrajet found in most GM vehicles, have a special screw and require a specific adjusting tool. True as that may seem sometimes, the simple fact is, if your Amal carburetted British motorcycle isn't running as well as it should, a quick checkup and rebuild of the Amal Concentric carburetors might be just what the doctor ordered to get you back to running well. Some of our customers think it's a jetting problem. … Other carburetors may have a 4 corner idle mix adjustment (4 idle mixture screws). It could alsovery well be a misadjusted circuit in the carburetor … There's an old saying that 99 percent of all carburetor problems are electrical. Honda GoldWing GL1000 specialist.

If the main jet is too rich, acceleration will feel slow or stuttery. Fuel flow problems can be caused by a clogged fuel filter, a clogged fuel line, a faulty fuel supply valve or a faulty fuel pump (on those scooters that use one). The excess air enters through a leak in the intake manifolds on either end of the carburetor, usually through a loose or damaged manifold. Temporary Repair. As an engine piston goes up it frees space inside the cylinder, creating a lower pressure environment. A properly tuned and carbureted engine will accelerate smoothly and quickly through the gears. The Quadrajet uses a Double "D" carburetor adjusting tool. A motorcycle carburetor is a device that blends air and fuel for an internal combustion engine . A problem with divorced chokes is the use of an incorrect thickness carburetor to manifold gasket when the carburetor is rebuilt. Close the throttle from full to about ⅞ open when RPMs are over 4500. A carburetor uses intake vacuum to supply fuel to the engine. (Not sure how your carburetors are set up.) Accelerate and shift through all gears at the proper RPM. Problems with the carburetor Problems with valve clearance Fuel Flow. This needle valve meters your fuel entering the carburetor bowl.

Carburetors depend upon differences in atmospheric pressure to aid in their task of mixing air with fuel. One way to bypass all these components is to rig up a temporary gravity fed fuel flow directly to the carburetor. In your detective work of finding your carburetors problem, consider the needle valve as your starting point. A common problem that most motorcycles face is an infiltration of air into the combustible air and fuel mixture that powers the engine. I cannot stress this enough, nearly ALL motorcycles produced have a service manual available in some form either used or new, digital or print. Restoration resources for GL1000, GL1100, GL1200, GL1500, CBX, CBX500, FT500, DOHC-4. Open the hood and locate the carburetor body.