Starting at the airbox, through the carburetor and fuel injectors, and ending at the tip of the exhaust tailpipe, the Motorcycle Fuel Systems Techbook by Haynes covers it all!
But the book does not stop there. Other systems such as turbochargers, superchargers, fuel pumps, electronics, funny fuels and testing equipment like dynos, are also covered.
Book Excerpt: Motorcycle Fuel Systems Techbook: All Carburetor Types and Fuel Injection
CARBURETOR CONSTRUCTION AND ADJUSTMENT
Despite the enormous range of motorcycle engine size and types since 1950, carburetor design can be condensed down into something like four basic formats. Different makes of carburetor obviously have their own features and style, but if you are familiar with the basic family type, you can quickly find your way around any carburetor.
There are a few particular makes that have either been used on a wide variety of machines or, if not used themselves, have influenced other designs that were. It is worth looking at them in some detail, partly to see how their influence has permeated through to current design (in fact some of them are still current). The other part of the reason is that many of these carburetors will be fitted to older, now classic machines and will need to be restored and overhauled, so some detail explanation may be useful.
There are plenty of other carburetors used on bikes but not mentioned specifically in this Chapter (eg Bing, BVF, Hitachi, Jikov, TK(TeiKei) and Weber) but their construction and operating principles are very similar to the types that are described.
To keep fuel rails at a constant pressure, the pump is given more capacity than the engine needs and excess fuel in returned to the tank via a pressure regulator. This takes the form of a pressure vessel in which a piston is sealed by a diaphragm and held under spring tension. When fuel pressure on the opposite side is greater than the spring force it lifts the piston, opening a valve which returns fuel to the tank. As the pressure drops, the spring pushes the piston back to close the valve. Usually the non-fuel side of the piston is vented to one of the intakes downstream of the throttle valve, so the fuel pressure is always a constant amount above intake air pressure. This is essential in supercharged applications.
Some regulators have an adjusting screw that alters the preload on the spring, so the lift-off pressure can be regulated. Raising the pressure in a fuel injection system has the effect of richening the mixture all the way through the range.
Regulators are tested by applying pressure, either from a pump with a pressure gauge or a deadweight pressure cylinder, to see if the valve opens and closes within the specified range. Kerosene, as a less volatile and ignitable liquid, is used for this kind of test.
All carburetor types, along with li> Overhaul
fuel injection, from basic theory to practical tuning.
Note: this book supersedes #603 Motorcycle Carburetor Manual by Haynes.
Subject: Motorcycle fuel systems manual: service, maintenance, repair. ISBN-10: 1859605141 | ISBN-13: 9781859605141 | Haynes 3514