The three tumors

there are three fairly complex systems on our bikes, that are fairly easy to disable, but to fully extract them requires a bit of surgery.

- exhaust servo valve system
- secondary air injection system
- charcoal canister fuel vent system

There are threads on removing the servo valve, as well as dealing with the actual exhaust butterfly.

The secondary air injection system - installing blockoff plates and plugging the hoses is one thing, but I'm curious about removing the actual valve that's tapped into the underside of the airbox. What sort of part would be required (size of bolt, etc) would be required to seal it off? And will the bike throw a CEL code if the valve is unplugged?

Plugging up the charcoal canister system is also easy and well-documented, but the hoses coming out of each throttle intake are still there, and connected. The complete solution is to find the right bolt to screw into that intake port and seal it off.

For a few hours effort, maybe half a pound of ancillary parts can be removed, but for those of us that are OCD, the sense of well being is priceless

Either that, or it's a good project for rainy weekends or the winter, when you're really, really, REALLY bored

I've figured out the required bolt size to make the entire charcoal canister system disappear, which I've posted in the thread regarding canister removal.

still puzzling over what to do with the secondary injection valve assembly. I guess I can just plug the two air outlets, but I would LOVE to be able to yank the whole thing. I would just need some kind of special part to block off the resulting hole in the bottom of the airbox. I'm surprised no one has made a kit for this....only the block off plates themselves.

oh, and depending on your tuning setup, there's a 4th system to eliminate - the O2 sensors. Thankfully, that one is easy. Unplug, reroute the harness plugs to get them out of the weather, remove sensors, and then install 12mm bung plugs.

what's the purpose of sealing secondary air injection system?
won't it introduce some new problem ?

ojdeteos said:

what's the purpose of sealing secondary air injection system?
won't it introduce some new problem ?

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The only purpose is for dynamometer tuning accuracy. Nothing else. It is a lot of work and only helpful if you are using a very good tuner to flash your ECU.

cosmok said:

The only purpose is for dynamometer tuning accuracy. Nothing else. It is a lot of work and only helpful if you are using a very good tuner to flash your ECU.

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I see, Thanks for the insight.

cosmok said:

The only purpose is for dynamometer tuning accuracy. Nothing else. It is a lot of work and only helpful if you are using a very good tuner to flash your ECU.

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In addition to helping with emissions, SAIS also plays a part in improving low-RPM ride-ability.....if you remove the SAIS and do not have a custom tune (TuneBoy/RapidBike) installed, you're gonna have a bad time.

Angus1609 said:

In addition to helping with emissions, SAIS also plays a part in improving low-RPM ride-ability.....if you remove the SAIS and do not have a custom tune (TuneBoy/RapidBike) installed, you're gonna have a bad time.

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Didnt really notice a difference when i did mine (running slip-ons & upmap).
Had the charcoal cannister off-no issues
had the exhaust valve removed- no issues
SAI blocked off-no issues
Wanting to remove the O2 sensors-when i get a tune done. might go rapidbike autotune.

Angus1609 said:

In addition to helping with emissions, SAIS also plays a part in improving low-RPM ride-ability.....if you remove the SAIS and do not have a custom tune (TuneBoy/RapidBike) installed, you're gonna have a bad time.

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you're going to have a worse time if you pull the O2 sensors before the custom tune is complete. I had to ride my bike for two weeks between my initial mapping session and the final, and with the O2 sensors shut off during that time, low-speed rideability was pretty sketchy (it's better than stock now, and the O2 sensors are removed from the bike now).

if anyone is truly interested in deleting the SAIS valve, the part that goes into the airbox has a diameter of 15mm (I measured with calipers today). So that's how big a blockoff bolt assembly would have to be.

Xze