What is the ideal voltage to a spark plug?

[Tazz]

Some may regret you didn't die at an early age too ...

What's your excuse? Coat hanger still stuck halfway through your swede or something?

[T.W.R]

typical tripe & waffle of KB when someones after a plain answer

Basically CDI ignition produces upto 500v supplied to the primary winding of the coil...averaging around 400v
secondary winding of the coil is usually 100:1 ratio theoretically producing 40,000v (but only in theory). In the combustion chamber
5,000 - 10,000v is more than enough.
Then for perfect spark a lot of maths is involved with spark duration, spark plug gap, mixture ratio, compression ratio etc etc.
Average ideal voltage is the 5k-10k area for most motorcycle engines

[Nobbsie]

Sweet thanks man!