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Carburator diagrams11/16/2023 This section needs additional citations for verification. Colloquial abbreviations include carb in the UK and North America or Carby in Australia. The name is spelled "carburetor" in American English and "carburettor" in British English. Thus a carburetor mixes intake air with hydrocarbon-based fuel, such as petrol or AutoGas (LPG). The name "carburetor" is derived from the verb carburet, which means "to combine with carbon", or, in particular, "to enrich a gas by combining it with carbon or hydrocarbons". Diesel engines have always used fuel injection instead of carburetors. In addition, they are still widely used on piston engine driven aircraft. lawnmowers, generators, and concrete mixers) and motorcycles. Since the 1990s, carburetors have been largely replaced by fuel injection for cars and trucks, but carburetors are still used by some small engines (e.g. The primary method of adding fuel to the intake air is through the Venturi tube in the main metering circuit, though various other components are also used to provide extra fuel or air in specific circumstances. Two-barrel downdraft Holley 2280 carburetor Cross-sectional schematicĪ carburetor (also spelled carburettor or carburetter) is a device used by a gasoline internal combustion engine to control and mix air and fuel entering the engine. There is no need to remove them normally I took the one off for this article so you could see how they're retained, etc., and since it's new I wasn't worried about tearing it.For chemical reaction of carbon dioxide, see Carbonation. Going into mine pretty soon and I plan to take some pictures, but they won't be this good.ĪNOTHER NOTE: The rubber "boot" on the enrichment plunger guide/retainer is currently NOT AVAILABLE so be very careful with those. Great! Wish something like this was available for Hitachi carbs. XJ4Ever now carries replacement enrichment plunger boots for most applications. More to follow, in Part 2 but there was no sense in waiting for that to get finished. As always, comments or suggestions are welcome. Hope this helps get anybody fighting with Mikunis a bit more to go on. There is no need to remove them normally I took the one off for this article so you could see how they're retained, etc., and since it's new I wasn't worried about tearing it. Use too big of a drift to remove the tube and you could shear it clean off.ĪNOTHER NOTE: The rubber "boot" on the enrichment plunger guide/retainer is currently NOT AVAILABLE* so be very careful with those. Care needs to be taken in both removing and reinserting the emulsion tube so that this pin doesn't get damaged. NOTE in the pics of both the top and bottom "stripped" the locating pin for the needle jet/emulsion tube. Again, note that the enrichment feed tube is fixed, and removal should not be attempted: These components (and the floats and needle valves, already removed) come out the bottom: Note that the Enrichment Tube is FIXED and cannot be removed.Īnd here's the bottom, stripped. These generally stay behind and need to be picked out with a hook-shaped implement of some sort, being careful not to gouge up the bore and screw seat in the process. Note in the EXPLODED VIEW the tiny o-ring and washer on the PILOT MIXTURE SCREW. These components come out of the TOP, once the Hats, Diaphragm Springs and Diaphragm/Slide/Needle assemblies have been removed: HOLY CRAP Fitz, where'd ALL THAT stuff come from? Here we go, an EXPLODED VIEW with everything as close as I could get to having it all fit the diagram: Part three will cover throttle shaft seals but it's going to have to wait until I NEED to do some. Part two will be a step-by-step breakdown of a rack for "basic" carb service part of regularly scheduled maintenance. This is part one, containing an "exploded" view, all labeled and diagrammed. Alrighty then fellow Mikuni sufferers, it's time to spread some info on the "neglected" carburetors, the Mikuni BS28s as fitted to the XJ550s, both Seca and Maxim.
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