A Jolting Development
Ignition is one area that's often overlooked, but if your sparks can't keep up with the rest of the engine, then all the hot-rod parts in the world won't be worth a tinker's damn. How much horsepower can be set free depends on how good the ignition system is to begin with, and how your engine is set up. If you're at the pipes and airbox stage, and the OEM ignition is up to snuff, then chances are the only improvement you'll notice is slightly stronger throttle response, and maybe a little smoother running. However, if you're riding an older bike with a marginal ignition system or your OEM system isn't what it should be, then you'll certainly pick up a few extra ponies. By the same token, if you've taken your mill beyond the bolt-on stage with things like high-compression pistons and radical cams, an ignition modifier, for example something like the Dyna 3000, which provides alternate ignition curves and selectable rev limits, may be indispensable. Be advised that aftermarket coils may not be compatible with factory-installed ignition systems or wires. Read the manufacturer's recommendations carefully so you know what you'll need.