Jetting and Fi2000 Questions

The answer to the question we get asked the most is: Yes, you should re-jet your carburetor equipped bike with a jet kit or re-tune your fuel-injected bike with a Fi2000 when you add an aftermarket exhaust system. Here's why:

In order to pass increasingly stricter emissions standards, most modern motorcycles arrive from the factory in a borderline lean condition. This means that the air fuel mixture is set with less fuel and more air than the bike needs to perform at its full potential.

By adding a freer flowing exhaust, or air filter or both, the air fuel ratio becomes even leaner. The motorcycle will exhibit conditions such as backfiring on deceleration, an uneven idle or surging at constant throttle settings. This lean condition can also make your engine run noticeably hotter.

Don't let your resident neighborhood expert tell you that that's the nature of an aftermarket system or a certain manufacturer's pipes. Poor performance as we've discussed above is a result of an incorrect air-fuel mixture, not a pipe.

In most cases, re-jetting (for carburetors) or adding an Fi2000 for fuel injected models will correct these conditions by optimizing the air-fuel ratio and allow the motorcycle to reach its performance potential.

If you no longer have the instructions that came with your jet kit or Fi2000, you can download a new set from our web site. Just go to your bike, and click the fuel management tab. Select the product and you will be able to access the instructions. Most of your questions can be answered there.

California residents should select the units approved for their state. These models take all the guesswork out by tuning automatically. And yes residents of other states can use this unit as well. They perform flawlessly.

    Emissions Notice

    The state of California considers aftermarket exhaust systems to be legal replacement parts for non-catalyst equipped motorcycles and/or if slip-on mufflers are installed downstream of the OEM catalysts.

    California does not allow the use of aftermarket systems that remove original equipment catalysts, (except for racing use only) unless the Air Resources Board has issued an Executive Order for that system.

    For California riders we offer Air Resources Board approved Fi2000 R ARB units. (ARB E.O. No. D-633-1). All other Fi2000 models are not legal for street use in California.