Bonneville America Forums Forums Technical Forums Performance Mods need help to remove the AI where to start

The O2 sensors only operate in closed loop mode (closed or nearly closed throttle) so they won't have much influence on running rich or lean except during closed throttle. So you can remove the AI and leave the O2 sensors operating (but the leaner mixture they ask the ECM for during closed throttle won't actually be delivered because the AI is removed). The worst that can happen is that you run rich during closed throttle - or more correctly have more unburnt mixture in your headers during closed throttle.

IMPORTANT: If you have CATs in your headers it is not recommended that you remove the AI because there is some fear they may melt without the AI. Australian bikes and most USA bikes DON'T have CATs in their headers but it is thought that LA bikes and maybe European bikes may have two pairs of CATs - one pair in the silencers and one pair in the headers. The bikes that DON'T have CATs in the headers have them in the stock silencers (mufflers).

Removing/blocking the AI will reduce the popping. You can also turn off (disable) the O2 sensors by using Tuneboy. This will entirely eliminate the popping and also improve the snatchy throttle of EFI bikes. The AI solenoid can be left intact and electrically connected on the bike with the AI removed. If left on the bike it will produce loud clicks as it tries to pump air in the non-existant AI. It can be removed by replacing it with a 10watt 50ohm resistor. This will eliminate the annoying clicking and the ECM will not throw a warning light because it sees the resistor and thinks the solenoid is still attached.

Hope this helps.