The,Method,Diagnose,Carburetor car The Method to Diagnose Carburetor Problems
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Before attempting to fix acarburetor problem, it is very important to come up with the correctdiagnosis.Carburetors are relatively simple devices.Their primary function is to deliver the correct amount of fuel/air mixture ata given throttle opening (as selected by the rider). However, as with allmechanical devices, carburetors will wear over time and will also requireperiodic tuning and service.Carburetor problems generally fall intothree areas: rich mixture, lean mixture, and incorrectadjustment. Diagnosing carburetor problems is relatively easy and follows sometelltale symptoms. Three Carburetor Problems1) Rich Mixture means the carburetoris delivering too much gasoline. Typical symptoms of a rich mixture are:Poor fuel economySluggish accelerationChoke not needed from cold startsSooty or black spark plugsSooty or black muffler end pipesStrong smell of gasoline when machine is atidleUneven running (will often slow fromregular idle rpm's and stop) 2) Lean Mixtures means the carburetoris delivering too much air. Typical symptoms of a lean mixture are:Backfires as the throttle is closed(primarily during coast-downs)Lurching accelerationWhite or light grey spark plugsRequires excessive amounts of choke torun/startWhite or light grey muffler end pipesBluing (on chrome systems) of the exhaustheader down-pipes 3) Incorrect Adjustment applies tocarburetors that have incorrect adjustment of the air/fuel screw andthe balance between two or more carburetors - where fitted. Incorrectadjustment can produce any of the previously noted symptoms. On multi-cylindermachines,with separate carburetors for each cylinder, the following symptoms are typicalof an adjustment problem:Poor overall performanceRattling sounds from the clutchEngine tends to stall easilyErratic accelerationPoor fuel economyMisfires and/or backfiresCorrecting Carburetor Problems Lean Mixtures: This condition isgenerally caused by the owner fitting after-market accessories such as exhaustsystems, air filter systems or replacement carburetors of a different type orsize. In addition, if the fuel level in the float chamber is set too low,insufficient fuel will be drawn through the main jet. Some carburetors have aslow speed fuel adjusting screw that regulates the fuel/air mixture in thelower rpm range. The carburetor shown in the accompanyingphotograph has a low speed air adjusting screw. Turning this screwclockwise will reduce the amount of air entering the carburetor, and willtherefore richen the mixture (refer to a shop manual for correct settings). If no changes have been made to the bike,and it previously ran well, a lean mixture can be traced to a leaking inletmanifold or leaking exhaust (often at the interface of header pipe and cylinderhead). Rich Mixtures: This condition isprimarily caused by dirty air filters, but it could also result from the ownerfitting replacement exhausts and/or carburetor systems. If the fuel level isset too high in the float chamber, a rich mixture will result. Incorrect Carburetor Adjustment: Thissituation is mostly caused by poor maintenance. With the inherent vibration ofall engines, carburetor parts (primarily adjusting screws) tend to rotate, andtherefore change their positions. Low-speed running jets and multi-cylinderbalancing screws are the items most prone to self-adjust during normal operationand often require periodic corrections. Find out more about Suzuki 370Q carburetor by visit miparts.com.
The,Method,Diagnose,Carburetor