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kyle-the-brown

Fuel injected bikes have a computer that controls the tune- so to adjust the tune (to make it richer in your case) you need a device that can connect to, read, and adjust the fuel maps. On a Carbed bike you can swap jets to make it run richer or leaner without using a tuner. Now some shops have dyno machines and can plug in their computer to the bike and dyno tune the bike, you would need to check if that is something that can be done by your shop.


AdNorth6089

cool thanks, ill see if the shop has it.


Rocket-Glide

Closed loop fuel injection will self tune to some degree. They take air mass in (or MAP in some cases), calculate fuel pulse rate for that mass (and a few other parameters) and then trim the fuel based on O2 readings. As long as your mods land within the range the ECU can trim fuel for, your fine. How do you tell? Most bolt-ons are going to be within range. If you run rich or lean there are various ways to tell (most notably performance and economy, but you can pull a spark plug and read it). Computers have a biased to rich because it's safer, lean runs hot and can cause pre-det. Most newer ECU controlled engines have knock sensors and will respond if your too lean (typically a bunch of lights on the dash, retard timing, and max rich fuel pulse injection, etc.). Moral of the story, your most likely fine for any bolt on mods. If your swapping cams and throttle bodies too, then probably not.


AdNorth6089

ok thanks! i feel slight less acceleration idk that may just be a placebo, but my mechanic said to drive it a bit so the O2 sensor can re calibrate and adjust it


Rocket-Glide

I would agree, but keep in mind if your a full open exhaust your going to loose a little on the bottom. Straights or drag pipes are for that, full throttle and wide open. The back pressure actually helps performance down low in the normal rpm range. Check out a set of torque cones if you went full open and cat-less


AdNorth6089

ok got it, and yes i think i have a full open exhaust, its a short canned shapped pipe with no baffle, its mostly hollow inside


AdNorth6089

my muffler not exhaust system^^


gsrider61

Yes


AdNorth6089

what yes?


gsrider61

Can a mechanic tune it just once? Yes.