RE: converting a .21 nitro to spark ignition
What parts are you looking for? I think all the stuff you need is the cdi, hall sensor, magnet, 1/4"-32 spark plug and a 4-cell reciever pack. Links to the parts I plan on buying can be found in my first post. A walbro carb might be needed to, but I doubt we will find one small enough for our engines. Im not really of much use other than that sorry. Once I have got my parts and given this a shot I will let you know if I get it working or not.
Is your engine a for a car?