download kick start mechanism animation
#1

I AM ABHAY SHARMA I WOULD LIKE TO GET DITAILS ON KICK START MACHHNISM
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#2
Kick start is a method of starting an internal combustion engine (usually that of a motorcycle) by pushing a ratcheting lever with one's foot. Kick start mechanisms were almost universally a part of motorcycle engines before the mid-1970s, and were phased out of production over the next twenty years or so as electric starters became standard equipment. There are still some motorcycles produced that have both kick and electric starters.

Many mopeds and scooters also carry both a kick start and an electric start, the former being useful in case the latter fails, as scooter and moped batteries tend to be smaller and, as a result, run down much faster than other forms of automotive batteries. Also, it is usually not possible to push start a moped or scooter with automatic transmission.


Some designers place every part of the Kick Starter inside the crankcase, with only the shaft sticking out. The Kick Starter has a gear on it's shaft. That gear moves back and forth on the shaft in grooves cut in the shaft. When you turn the Kick Starter the gear is thrown into mesh with an idler gear which in turn is in mesh with the mainshaft of the transmission. The mainshaft is connected to the clutch and the clutch is connected to the engine crankshaft. When the engine starts and you release the pressure on the Kick Starter, the kick start gear is thrown out of mesh with the idler gear. The problem with this arrangement is that all the Kick Starter gears and springs are within the crankcase. You must remove the engine from the frame and split the crankcase if a gear or spring breaks. This is not good. A lot of the early Honda dirt bikes were like this.

A slightly better way has the kicksarter return spring on the outside of the crankcase and everything else on the inside. At least with this arrangement you can replace the spring if it breaks.



Kick Starter Spring outside the Crankcases.

External Kick Starter GearsExternal Kick Starter GearThe best way is with everything on the outside of the crankcase. It basically works the same as the internal type but you can easily get to everything to fix it. Just take off the clutch cover and, at worst, the clutch basket and there you are. The kick starter shaft turns, forcing the Kick Starter gear into mesh with the idler gear. The idler gear is already in mesh with the big ring gear on the clutch, which is also in mesh with the gear on the end of the crankshaft. All this turns the engine over and starts it up.

To work, the starter gear has to be able to lock in place when the Kick Starter is depressed and then unlock when the Kick Starter is released and the engine starts. There are a lot of ways to do this.

Lateral Engagement Kick Starter
Full Ratchet Kick Starter
Pawl Ratchet Kick Starter
Quadrant Gear Kick Starter
Starter Gear and ClipStarter Gear and ClipIn a Lateral Engagement Kick Starter, grooves on the shaft allow the gear to move back and forth, engaging the idler gear to start the engine and then disengaging the idler gear when the engine starts. This is done with a friction spring clip around the shaft and grooves cut at an angle on the Kick Starter shaft. When the shaft is turned in one direction, the gear moves lengthwise along the shaft. When the shaft turns the opposite direction, the gear also reverses direction. The friction spring clip rides in a groove cast into the

A Full Ratchet Kick Starter is another way to engage and disengage a starter gear. A beveled edged arm, or Ratchet Tab, is cast as part of the starter ratchet. This arm pushes against an angled metal lock out plate, when the Kick Starter is at rest, pushing the ratchet out of mesh with the starter gear. The starter gear is in mesh with the idler gear and spins with it freely. Pushed by a spring, when the Kick Starter shaft is turned, the ratchet locks with the starter gear turning the engine over, and starting the engine.

Starter Gear and ClipStarterGear and ClipIn a Pawl Ratchet Kick Starter there are pawls between the Kick Starter shaft and the Kick Starter gear. These pawls lock the shaft to the gear when the shaft is turned one way and release the shaft when it is turned in the opposite direction.



Lastly is a Quadrant Gear Kick Starter. It uses a kind of half gear that engages a Kick Starter pinion gear when the Kick Starter is rotated. This spring loaded pinion gear has ratchet teeth that allow it to lock up when turned in one direction and slip when turned in the opposite direction. Quadrant Gear style Kick Starter are used by a number of British, European, and American Motorcycle engines.
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