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A belt-drive is still subject to stretch but operates very quietly, cleanly, and efficiently. A toothed belt is frequently used. However, they are not as durable when subjected to high horsepower as a chain. You can not alter the length and change final drive ratios as easily as chains. They also can not wrap as closely around chains.
For motorcycles with chain drive, the gearbox output shaft is typically connected to the sprocket which drives the final drive chain. Most modern manual motorcycle gearboxes have "constant-mesh" gears which are always mated but may rotate freely on a shaft until locked by a toothed sliding collar, or "dog clutch".
Drive shafts are another common method used to move mechanical power around that is sometimes evaluated in comparison to chain drive; in particular belt drive vs chain drive vs shaft drive is a key design decision for most motorcycles. Drive shafts tend to be tougher and more reliable than chain drive, but the bevel gears have far more friction ...
Motorcycle engines can be mounted transversely; with the crankshaft aligned perpendicular to the frame or longitudinally, with the crankshaft parallel to the frame. Motorcycles with transversely mounted engines are more suited to have chain or belt final-drive. Motorcycles with longitudinally mounted engines are more suited for shaft final-drive.
Though belt drives have greater power loss than chains, which are typical of high-performance motorcycles, they do not suffer from chain lash, since chains must be kept slightly loose but belts remain tight at all times, meaning the responsiveness of the drivetrain is comparable to a heavier and more costly shaft drive. [4] [5]
Final drive is via a belt drive. [6] In 2011, the Thunderbird Storm variant model was released featuring the previously optional 1,699 cc (103.7 cu in) engine fitted as standard, twin headlamps and with a number of black, rather than chrome parts [7]
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