How many spark(s) per revolution do/does our bikes fire off per revolution?

thanks thumper  

Every time the piston goes up. Just like a lawnmower. The mechanical stuff to fire the plug only when it's time is expensive. It's just wasting a spark..

Drestakil wrote on 10/19/15 at 17:19:46:


Wrong....the ignition trigger is on the crank, and it tells the coil to spark every time the crank get to TDC.  It doesn't know what the cam is doing, it just sparks every time the piston is at the top of the bore.

Drestakil wrote on 10/19/15 at 19:56:50:


Would you mind reciting the exact phase, I seemed to have missed it.

Read that paragraph again.

The signal generator consists of a raised tab on the alternator rotor and a pickup coil attached to the alternator cover next to the alternator stator coil assembly. As the alternator rotor is turned by the crankshaft, the raised tab passes by the pickup coil and a signal is sent to the ignitor unit.

Every time it makes 1 full revolution, a spark is generated.

Drestakil wrote on 10/19/15 at 17:19:46:



Drestakil wrote on 10/19/15 at 20:14:16:


The rotor for the alternator is bolted directly to the left end of the crankshaft.  It has to turn in a 1/1 ratio.....they are "united"!

Every time the crankshaft turns the ignition system is triggered to produce a spark.....there is a spark made with every rotation.  1 spark for every revolution of the crankshaft.

thumperclone wrote on 10/20/15 at 04:49:48:


I know how to settle this:

1)  Remove the spark plug and timing cover.
2)  Place a 17mm socket and breaker bar on the right side of the crankshaft through the timing hole, and rotate the crankshaft until the TDC lines up.
3)  Place the spark plug back into the wire connector and hold it tightly in your left hand.
4)  With your right hand turn the ignition on, then using your right hand rotate the crankshaft brisky.
5)  Record if you twitch violently on every revolution....or only once every two revolutions!