V Star 650 AIS Removal

The AIS or Air Induction System on the Yamaha V Star 650 is designed to dilute the exhaust stream with fresh air to help burn unburned or incompletely burned fuel so the bike can pass emissions tests. Many cars have similar systems to get oxygen to the catalytic converters so the breakdown can happen. As far as I know the AIS has been on these bikes from the beginning and predate the later years where catalytic converters were put in the pipes and indeed other types of motorcycles had AIS or Pulse Air systems as BMW called it back into the late 70’s.

It seems to be the first thing people do with these systems when customizing their motorcycle is ripping them off and throwing them in the trash. Some of the reasons for this are simply to clean up the looks, and get rid of excess parts that could potentially fail and introduce air leaks. More importantly for people who install aftermarket pipes removing the AIS helps stop that annoying backfiring on deceleration, however, if it was tuned properly it wouldnt do that. If it was optimally tuned for your riding conditions from the factory it also wouldn’t need it, but bikes get shipped all over the world to many climates and altitudes so they have to use general settings that will work anywhere.

UPDATE: I have been reading some of the forum threads that have linked to this page and it appears to be possible to get better than stock emissions tests after the AIS is removed as long as the idle mix screws are adjusted and fine tuned.   Like I said, If the bikes were better tuned it wouldnt need AIS to begin with.

There is also the theory that removing the AIS causes the bike to run cooler because it is burning extra unburnt fuel and generating more heat that it otherwise wouldn’t have. I can confirm by closely monitoring my crankcase temperature gauge that my motorcycle does seem to run about 5-7C cooler with the AIS gone, on the other hand, I also had been doing lots of carb tweaks that week and cant entirely attribute it to only the AIS.

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Vaughn, NM

I mentioned earlier that Vaughn and Encino were pretty cool towns to photograph. I snapped a few photos out the window of the car on my way through to visit my bud Lalo who’s recovering from a bad motorcycle wreck. Again in a hurry I didn’t get to stop for long, maybe in the future when I’m not in a rush I can look around off the main streets for some other cool shots.

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Fall Colors

Was an absolutely beautiful day today. I spent the morning putting the bike back together and headed up the mountain to check out the fall colors and de-stress. The weather was perfect! Not too cold, not too hot. The sun was out with outstanding lighting.

I guess many others had the same idea as the roads were packed with cars and a fair number of bikes too. All were enjoying themselves. Got a few thumbs up from a few of the other motorists too, it felt good to be out.

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Airhead Cleanup

Oh No! Another bike tear down. My landlords must just love me.

Task at hand today is just to clean everything off somewhat, check the wiring and cables and inspect for any other unknown issues to get a better idea of what work lies ahead and what I’ve gotten myself into.

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