AIS Removal - Real Performance Gain?

[CJBROWN]

I've searched all the threads on what's involved with the mod, and I can see there is some advantage to not having all that clap-trap on the bike, but can anyone report that there is actually a performance gain without the AIS?

One of the posters on one of the AIS threads said you get nothing for it, just clean up the motor. Somebody else said gave some trouble with low speed jetting.

So, what is the straight skinny?

Edited March 12, 2010 by CJBROWN
cant spell for shiattt

[SlowDinoDog]

I haven't seen any absolute dyno results showig that there is any advantage to removing th AIS. I don't believe I could tell any difference by the "seat-of-my-pants" comparison. However, the AIS system and plumbing from my 2006 WR250F weighed a whopping 14 1/2 ounces, nearly a pound!!! Also, it made it inconvenient to remove the cover on the right side of the carb to tune the AP screw. I had no problems jetting the bike with it removed. Mine's in a box.

[NoFiddyPilot]

No performance advantage. But, removing it typically eliminates decel popping when performance jetted and can make more room for installing OS fuel tanks.

[Bud Bell]

The real advantage of buying the removal kit comes with the new throttle stop. I had the dealer remove mine before it left the show room.

[feckless]

no real power gain. just tidies up the look of the bike and makes working on the carb far easier.

theyare only fitted to pass emission test in certain countries

[William1]

Everyone is on the money. If you use a O2 sensor (wideband) the AIS can give you bad readings and make jeeting that method harder to do. If you jet by the seat of the pants as most do, the AIS does not make a difference.