Hi guys,

I was at my local dealer over the weekend and spoke to a guy that works there, whom I consider a friend. I think I need my bike jetted (I'll read more about that before I ask redundant questions) and he also recommended a K&N filter and an AIR INJECTION REMOVAL Kit. He said it was something that had to do with emissions and was restrictive, so removing it would help. It was only $30.

Who knows something about this AIR kit? Any experience with it?

Thanks, Mike

The air injection system pushes air into the exhaust so that any unburned fuel is reignited. It isn't restrictive to the engine at all. A lot of folks remove the system to clean up the appearance of the engine that's all. My '99 still has the system installed.

The stock K&N replacement air filter is a good idea because it can be cleaned instead of replaced and that's normally every 50,000 miles. The stock filter needs replacing a lot more often than that and is expensive.

Scott B.

What issues are you having that you feel it needs re jetted? looking for more power? bad gas mileage? fouling out plugs?

texasscott1 wrote:


The stock K&N replacement air filter is a good idea because it can be cleaned instead of replaced and that's normally every 50,000 miles. The stock filter needs replacing a lot more often than that and is expensive.

Scott B.

You clean it every 50k? Granted, it's cleanable and will last as long as the bike, but that does not mean by any means it should be cleaned at 50k, According to service manual they call for cleaning stock filter every 4k with compressed air. Since mine is an open filter, I clean mine every 10k, let it dry overnight, oil, let it dry overnight again, and install.

Now as far as the AIS, yes Scott is correct for it purpose, and will usually need to be removed if using after market pipes to avoid excessive decel popping. The amount of air it lets into the exhaust is metered for stock pipes, so too much air with after market pipes can cause popping as well as flames. Seen the flames on my friends bike after we did pipes and jetting, he left the AIS kit home, soooo, when he took off and decelling, nice purple flames out the pipes, was night too, so was a nice glow. lol, he did the AIS next day, and all was fine. But if you have stock pipes, doesn't make a difference on or off, no benefit for performance, zilch, none.

javawave wrote:
What issues are you having that you feel it needs re jetted? looking for more power? bad gas mileage? fouling out plugs?


I have COBRA pipes and it is a 2001 bike.

Here are a few of the "problems" I have:

1. I doesn't start easily without the choke, even when warm. I can never start it without the choke, no matter the ambient temperature. When warm, it takes a little throttle to get her going and that's what I do. I don't even know if this has anything to do with jetting, so if it doesn't, please clue me in.

2. This is what really makes me think it needs jetting...hard to explain. Riding along and slow for a turn...drop a gear (let's say 3rd, so not like a stop sign or light, a moving lane cross or the like) and with clutch pulled in, twist a little throttle to bring up the engine speed for the downshift, and it CHOKES. So overall it's like no throttle response in a case like this. This is the kind of situation that it is magnified in, but I'd say that throttle response is a problem.

I'd like to do one of the "Big Air Kits" that has the open K&N air filter that replaces the whole stock air box. Would a Stage 1 Jet kit be enough?

Local dealer wanted to charge me $207 to install my provided Stage 1 jet kit. I'm not about to pay that and I'll tackle it myself.

So, if I can get some better throttle response AND some performance/power, Great!

Thanks for your help guys!

Cracking the throttle with the clutch pulled in is called blipping and these bikes don't like that. Even with all the mods you can do to it they still will cough and puke when you blip. The AIS being on doesn't help trash asap. Don't rejet unless you put a more open air filter on it.

I think I need to mess with my PMS first. What do you think?

However, I know it's nearly impossible to get to the PMS on these bikes, but I did purchase one of those big adjuster screws from Phat Performance Parts, but I still can't imagine I'll be able to get to it, especially when it's hot!

Wear thin cotton gloves when make adjustment when bike is hot!

if SVS problem sooting on rear plugs white on front it will take more than one can 2-3 tanks of gas to get it clean up internally first step know what your jetting is inside then start fresh... better to know your bike "CARB" internally... then make yer adjustments as per the CLINIC Tech articles.. Do your research first! then ask...

Good Luck!



Blacksnake

i put the longer pms screw on my carb,i would just stop and remove my air cleaner,make a small adjustment and try again until i got it set.I also slipped a piece of fuel line over the screw and it made it a snap to turn the screw with or without the airbox on the bike.Either way the longer screw has been much easier than a small screwdriver on the stock pms screw..and it does sound like you need some adjustment on your carb..i used my fuel mileage to gauge my carb setting and the performance..had to run good and i get over 40mpg..so it seems like its the best of both for my 07 midnight..this is after i rejetted the carb and probably did not need to do so..but i had to get my hands in there.. and i removed the ais as it was useless to me..

I'm actually getting about 45 mpg. Around 190 miles til fuel light, then she takes 3.8 gallons.