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There is a great deal of talk among Star owners about removal or disabling of the A.I.S. (Air Induction System). This is an emissions control system that allows air to be drawn into the exhaust downstream of the cylinder head to ignite unburnt fuel vapor. This may cause some popping or backfiring, especially on deceleration. There is no performance gain to be made from removing this system; unless you object to the look of the chrome lines or you are bothered by the popping there is really no reason to remove it. More importantly, your state vehicle code may require that you need to leave all emissions controls intact.

I had no reason to deal with the A.I.S. until I modified my stock exhaust; with the center baffle removed there was a loud and frequent backfiring. I decided to disable the system by disconnecting the two rubber lines connecting the chrome lines and looping them back to their source (see illustrations below). I then used a golf tee to plug the small rubber line coming from the rear cylinder intake port. This disables the system while leaving all of the hardware on the bike.

After leaving the system disabled for several months and reading posts on the ISRA board, I realized that there were several problems with the process. First, I noticed that there was some cracking occurring in the rubber lines that I had looped. I heard accounts of chrome lines rusting through because of moisture accumulating in them. I checked mine, and sure enough I found water in each. Last, I discovered raw fuel accumulating in the line that I had plugged with a golf tee--not a desireable situation. These symptoms led me to the conclusion that this method of temporarily disabling the A.I.S. is not safe for the long term; I do not recommend it.

Since my state does not test motorcycle emissions systems I elected to remove the system altogether. I'll not go into the procedure here, as I just followed the excellent instructions found in a Starcruiser article found here. I plugged the A.I.S. ports with 10mmx25mm bolts, but there are plugs available from Pacific Coast Star and Motorcycle Enhancements. After removing the system mechanical parts and lines I also removed the line from the rear cylinder intake port and capped the nipple with a 3/16" vacuum cap. I saved all parts so that I could return everything to stock if necessary. The entire process took me about 45 minutes.