Editing Semi-automatic transmission (section)

=== Sequential manual transmissions ===
Several semi-automatic transmissions used by motorcycles and racing cars are actually mechanically based on [[sequential manual transmission]]s. Semi-automatic motorcycle transmissions generally omit the clutch lever, but retain the conventional heel-and-toe foot shift lever.<ref>{{cite web |url=https://www.wikihow.com/Shift-Gears-on-a-Motorcycle |title=How to Shift Gears on a Motorcycle |website=wikiHow}}</ref><ref name="itstillruns.com">{{cite web |url=https://itstillruns.com/shift-automatic-transmission-dirt-bike-7577353.html |title=How to Shift a 4 Speed Semi Automatic Transmission on a Dirt Bike |website=It Still Runs}}</ref><ref>{{cite web |url= https://www.cycleworld.com/top-automatic-motorcycles-you-can-buy-in-2019/ |title = Top Automatic Motorcycles You Can Buy in 2019}}</ref><ref name="autowise.com">{{cite web |url = https://autowise.com/automatic-dirt-bike/ |title = 10 Best Automatic Dirt Bike Models |date= 17 May 2021 |access-date=18 August 2020|archive-date = 25 October 2021 |archive-url = https://web.archive.org/web/20211025210426/https://autowise.com/automatic-dirt-bike/ |url-status = dead}}</ref><ref name="dirtbikehouse.com">{{cite web |url= https://dirtbikehouse.com/what-is-a-semi-automatic-dirt-bike/ |title = What is a Semi-Automatic Dirt Bike and How does it work? |date = 19 January 2020}}</ref><ref name="ktm.com">{{cite web |url=https://www.ktm.com/en-int/error-page.html |title=Error Page |website=www.ktm.com}}</ref>

Semi-automatic motorcycle transmissions are based on conventional sequential manual transmissions and typically use a [[centrifugal clutch]].<ref>{{cite web |date=8 May 2000 |title=How Chain Saws Work |url=https://home.howstuffworks.com/chainsaw4.htm}}</ref> At idle speed, the engine is disconnected from the gearbox input shaft, allowing both it and the bike to [[freewheel]], unlike with torque converter automatics, there is no [[idle creep]] with a properly adjusted centrifugal clutch. As the engine speed rises, counterweights within the clutch assembly gradually pivot further outwards until they start to make contact with the inside of the outer housing and transmit an increasing amount of engine power and torque. The effective "bite point" or "biting point"<ref>{{cite web |title=biting point |url= https://dictionary.cambridge.org/dictionary/english/biting-point |access-date=2021-10-15 |website=Cambridge Dictionary |language=en}}</ref> is found automatically by equilibrium, where the power is transmitted through the (still-slipping) clutch is equal to what the engine can provide. This allows relatively fast full-[[throttle]] takeoffs (with the clutch adjusted so the engine is at peak torque) without the engine slowing or being bogged down, as well as more relaxed starts and low-speed maneuvers at lower throttle and [[Revolutions per minute|RPMs]].