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The DB1SR is an even higher performance version with 4-piston front calipers, 41 mm carburetors, freer 2-into-1 exhaust and more radical cam shafts and was made between 1987 and 1989. Confusingly, most DB1SRs are labeled "DB1RS" on the fairing and some are styled differently with a rear red number plates and correctly labeled "DB1SR".
A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head, and merge into two pipes (secondary), which in turn finally link up to form one collector pipe. [2]
The side cover panel on the blue bike is silver; and on the red bike, the panel is black. The gas tank wing decal is two-tone. The 2-into-1 exhaust system is black chrome. The engine is a 491 cc OHC, 3-valve, liquid-cooled V-twin linked to a 6-speed transmission (1st: 2.86, 2nd: 1.95, 3rd: 1.55, 4th: 1.28, 5th: 1.07, 6th: 0.87) and a shaft ...
XL883R "Roadster" Frame mount models have a 2–1 exhaust, 13-spoke mags, black engine and are available in orange with 'R' graphics, rubber mounts get 2–2 exhaust, slightly different dualseat, wire wheel option and more 'R' colors, all have triple discs and rev-counter. In 2010, the XL883R officially gets the "Roadster" suffix
The vacuum wave arrives in the cylinder during the transfer cycle and helps suck in fresh mixture from the crankcase into the cylinder, and/or prevent the suction of exhaust gases into the crankcase (due to crankcase vacuum). [3] However, the wave may also suck fresh mixture out the exhaust port into the header of the expansion chamber.
Also known as the 400SS Junior, the models were based on the larger 750SS with which they shared a frame, engine and most other components. The most obvious differences were the 2-into-1 exhaust system on some versions (also used the 600) and the single-disc front brake. The 600SS had five gears instead of the six on the 350 and 400.