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Adjustment is accomplished by altering the starting position of the jet relative to the needle on a fine screw (26TPI for most pre-HIF versions). At first sight, the principle appears to bear a similarity to that of the slide carburettor, which was previously used on many motorcycles .
Additionally, a custom carburetor without a float needle didn't have the problems caused by vibration. And finally, the light-weight battery ignition allowed trouble-free engine starts and helped to keep the engine weight low. The distributor and the points were located in the hub. The technicians originally intended to build a dynastarter ...
Two-barrel downdraft Holley 2280 carburetor Cross-sectional schematic. A carburetor (also spelled carburettor or carburetter) [1] [2] [3] is a device used by a gasoline internal combustion engine to control and mix air and fuel entering the engine. [4]
Although the needle and jets were still offset, they were moved away from the side of the bore which simplified the needle mounting. Air for the pilot feed was taken from the outside of the carb through a drilling. The GP was available in four body sizes and in flange mounting only: [37] 15GP - 7/8, 15/16", 1" and 11/16" bore diameters
Rear swing arm stored in plastic bushings (needle roller bearings from the end of 1980) Ground clearance 150 mm (5.9 in) Foot peg height 355 mm (14.0 in) Hydraulically damped telescopic fork at the front (35 mm (1.4 in)) with 160 mm (6.3 in) travel; 2 hydraulically damped spring struts at the rear, springs adjustable in 5 positions
The term "choke" is applied to the carburetor's enrichment device even when it works by a totally different method. Commonly, SU carburettors have "chokes" that work by lowering the fuel jet to a narrower part of the needle. Some others work by introducing an additional fuel route to the constant depression chamber.
The carburetor has stock settings of 1-3/4 turns out for the air screw, the jet needle is set at the 3rd groove from the top, the float level is 18 mm, and it has a #75 main jet. [1] The transmission is 3-speed constant mesh, with a 3-up shift pattern, it uses a wet multi-plate centrifugal clutch, with the following gear ratios: 1st 3.272, 2nd ...
While the bore and stroke, and other major engine components, were unchanged, minor tuning adjustments were made. The carburetor diameters were reduced 2 mm to 30 mm (1.2 in), the cylinder compression ratio was increased from 12.0:1 to 12.4:1, ignition timing advance was increased, and the rear sprocket was increased by three teeth to 45.