I need a circuit to create a spark for ignition.

[XCVG]

You have two choices:

1. Camera flash. Dunno if it has enough oomph but it should work.
2. Ignition coil. If you can get it to work that is.

[AfroLH]

I saw the Camera thing on Manswers!

[gamemasterAS]

Yeah, I think the camera flash will be the best bet. Although, a long-necked BBQ lighter would do well too, as it could be implemented into a handle/trigger type dealio.

It has an electric sparker in it that's the exact same as a BBQ one just smaller that you could rip out.

I used to make little cannons with those, a film canister and pen.

Ahhh, to be 10 again.

[Triton]

use the igniter out of a cigarette lighter. works the same way as a BBQ one but is much smaller

[timmeh87]

I made an igniter out of some nichrome wire from a toaster, powered it with a car battery.

You gotta choose the length just right so it doesnt melt but gets orange-hot. I powered it with a car battery and an unnecessarily large breaker. Theres some lag on when it fires but the wires can be really long and theres no high voltage crap to deal with.