The air induction system

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Bernie
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The air induction system

Postby Bernie » Sun Dec 22, 2013 4:53 pm

The air induction system on the FJR is controlled by an air solenoid and a maze of pipes on top of the motor which are ugly, and get in the way when you are trying to do maintenance work on top of the motor. They can also cause problems in high mileage motors because the reed valves get gummed up with carbon and burnt oil sludge, and I don't know how reliable the air solenoid is. For this reason, and because the system only operates at idle or when the motor is cold, I have removed this system from my last 3 FJR's, and have just removed it from my 2014 FJR.

The remaining air pipes can be easily blocked off with rubber caps which are available from any automotive accessary shop and fit perfectly. The part numbers are WC12B for 1/2" caps (4 required), and WC58B for a 5/8" cap (1 required). You can use the OEM pipe clips off the original system to fasten the new caps. See http://www.supercheapauto.com.au/online ... 7849#Cross

Here are some pics to illustrate.

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Here is the write up from the 09 FJR maintenance manual.

Air injection.
The air induction system burns unburned exhaust gases by injecting fresh
air (secondary air) into the exhaust port, reducing the emission of
hydrocarbons. When there is negative pressure at the exhaust port,
the reed valve opens, allowing secondary air to flow into the exhaust
port. The required temperature for burning the un- burned exhaust gases
is approximately 600 to 700 °C (1112 to 1292 °F).

Air cut-off valve.
The air cut-off valve is controlled by the signals from the ECU in
accordance with the combustion conditions. Ordinarily, the air cut-off
valve opens to allow the air to flow during idle and closes to cut-off
the flow when the vehicle is being driven. However, if the coolant
temperature is below the specified value, the air cut-off valve remains
open and allows the air to flow into the exhaust pipe until the temperature
becomes higher than the specified value.

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Postby spottedninja » Sun Dec 22, 2013 6:13 pm

Does it run any better?

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Ken Fraser
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Re: The air induction system

Postby Ken Fraser » Sun Dec 22, 2013 6:40 pm

Hi Bernie,

Things look a bit different under a Gen 3 tank :think:
The throttle bodies and the spark plug caps !!!!

Do those spark plug caps have a built in coil ?

No Spotted, the bike runs the same, it's easier to work on.
Besides, the reed valves normally carbon up and the PAIR ceases to function.
Power Commander say in their instructions to block it off esp if you run after market pipes, stops backfiring.
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Diversion
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Re: The air induction system

Postby Diversion » Sun Dec 22, 2013 7:34 pm

Air induction was one of those things that really only ever worked just out of the factory
While the Yamaha one is very good compared to some the end result is probably a higher polution count with them than without.
As they age and clog up they affect the engine tune and not for the better
Vehicles that are not maintained as they should wind up polluting more because these devices are known to cause poor idle when cold
Also the increased weight and in some cases load on the engine in vehicles fitted with an air pump burns more fuel so of course that means more pollution.
The extra component manufacturing also adds a pollution cost.
So in a silly catch 22 situation vehicle manufacturers are forced to fit an item that actually results in more pollution in order to meet emissions targets :doh:
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Bernie
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Re: The air induction system

Postby Bernie » Sun Dec 22, 2013 8:46 pm

Ken Fraser wrote:Hi Bernie,

Things look a bit different under a Gen 3 tank :think:
The throttle bodies and the spark plug caps !!!!

Do those spark plug caps have a built in coil ?

No Spotted, the bike runs the same, it's easier to work on.
Besides, the reed valves normally carbon up and the PAIR ceases to function.
Power Commander say in their instructions to block it off esp if you run after market pipes, stops backfiring.

Yes, the plug caps have the high voltage system built in. I wondered who would notice that first. :clap: They are quite difficult to remove, I was very worried about breaking them when I took them off. Yamaha still fit standard plugs to this engine, I removed them and fitted Iridium plugs.

Also, the throttle bodies are different, remember this motor has "fly by wire", and cruise control. You can see the throttle cables go down the right hand side to a unit under the throttle bodies, they are not connected to the bodies directly. Unfortunately, this thing is not visible without some major dismantling. I have a paper version of the 2013 service manual on the way, couldn't find a pdf version, so I don't know what it looks like.

I haven't ordered a power commander for this bike yet, they had to design a new one for this model because of all the changes. The O2 sensor has been moved to the back of the exhaust collector box, in between the exhaust outlet pipes. I had to crawl under the bike and get my head behind the centre stand before I could see it.

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Re: The air induction system

Postby The White Tiger » Mon Dec 23, 2013 8:19 pm

Bernie, for mechanical dumbasses like me, what are the possible problems in high mileage motors?
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Re: The air induction system

Postby Ken Fraser » Mon Dec 23, 2013 9:08 pm

Hi Bernie,
How is the fuelling on the bike ???
Would it need a PC5 ???, most of the posts I've seen have been rather positive :dance:
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Bernie
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Re: The air induction system

Postby Bernie » Mon Dec 23, 2013 10:23 pm

The White Tiger wrote:Bernie, for mechanical dumbasses like me, what are the possible problems in high mileage motors?

I don't think there is much wrong with the motors, they are basically bullet proof. The problem with high mileage / old age bikes, is all the ancillary stuff, worn suspension, corroded connectors, failed sensors, jammed up hydraulics, and so on. That's why I don't keep a bike longer than 3 years, and of course, the trade in value. :snooty:

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Bernie
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Re: The air induction system

Postby Bernie » Mon Dec 23, 2013 10:37 pm

Ken Fraser wrote:Hi Bernie,
How is the fuelling on the bike ???
Would it need a PC5 ???, most of the posts I've seen have been rather positive :dance:

I think the fuelling is not too bad, the (minor) problem lies with the "fly by wire". There are times when it does not deliver the instantaneous and very fine control that you have with the old mechanical system. I had my last 2012 FJR running exceptionally well with the PCV, Autotune, and careful adjustment of throttle bodies and throttle cables. It responded better than this one.

Mind you, I had only done 850 Km before I crashed it, and I hadn't done any tuning. I think I probably will fit a PCV and Autotune later.
Oh, the low power mode is hopeless, I don't think I will ever use it.

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Ken Fraser
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Re: The air induction system

Postby Ken Fraser » Tue Dec 24, 2013 7:29 am

If "they" want a low power mode, maybe "they" should buy a different bike :lol: :lol: :lol:

I think the fuelling on my new bike is spot on, they do have a PC5 for them but you have to flash the ECU for some reason before hand. A small problem with the Guzzi is that the throttle is a bit too light, have a set of puppies on now, somewhat better.
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