Conversely, if you’re running a carbed bike, there are still tweaks you can make. Increasingly stringent emission laws mean your bike more than likely came from the factory jetted on the lean side, in which case a simple jet kit should be all you need to put things right. As the name implies, a jet kit packs together a selection of jets, both main and pilot, a new needle, any needed shims or springs, and, crucially, a set of installation instructions and jetting guidelines covering a variety of scenarios. You can also find kits specifically designed to work with a specific manufacturer’s pipe and airbox modifications.
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Result: If added to a stock bike, gains will be marginal, though it should smooth out fuel delivery. On a modified bike, jet kits make tuning easier, and best of all, they’ll run you about $85 to $200, depending on the application.
Ignition is one area that’s often overlooked, but you can set some more horsepower free depending on how good your ignition system is to begin with, and how your engine is set up. Modifying your ignition for a bigger control angle can give you a little kick, considering this is the place that generates the energy to ignite the fuel and air in the engine cylinder. If you’re just doing the pipes and airbox and your stock ignition is up to the job, then the only boost you’ll probably see is slightly stronger throttle response. But on an older bike or a so-so ignition system, chances are good you’ll gain a few extra ponies. Even new, upgraded plugs can help. Tread carefully though; aftermarket coils may not work with factory-installed ignition systems or wires. Read the manufacturer’s recommendations carefully so you know the deal.