secondary air system? - MVAgusta.net
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post #1 of 40 (permalink) Old 12-19-2016, 12:46 AM Thread Starter
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secondary air system?

am doing a service on my 2013 Brutale 1090R and noticed that the pipe that a hose plugs into (bottom front of airbox - see breakout in pic #18) is blocked with a 6mm bolt and sealant
the parts list says its a 'connector, pipe secondary air'
have seen references to this system in the forum, but not sure what its for or whether it should be blocked
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post #2 of 40 (permalink) Old 12-19-2016, 05:42 AM
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The secondary air system allows air into the exhaust ports to help with burning the residual hydrocarbons coming out of the combustion chamber. It's an emissions control used on just about every bike and car today.
It has absolutely nothing to do with horsepower.
Regardless, many people remove the system for various reasons. In my case it was removing plumbing that gets in the way of valve cover removal......and of course, tiny bit of weight loss.
So the question is, did whoever plugged the air supply also plug the inlet spigots on the valve cover and remove the solenoid that opens the passage for air?

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post #3 of 40 (permalink) Old 12-19-2016, 05:53 AM
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Do the 1st Gen (F4) bikes have this also?

Tis better to remain silent and be thought a fool, than speak aloud and remove all doubt
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post #4 of 40 (permalink) Old 12-19-2016, 03:21 PM Thread Starter
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esq'z me, thanks for the info
i bought this bike with a full arrow system - no cat - and power commander and autotune, so maybe that has something to do with it
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post #5 of 40 (permalink) Old 12-19-2016, 03:26 PM Thread Starter
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i'll pull the tank off again and check whether other things are blocked, the plumbing is still there
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post #6 of 40 (permalink) Old 12-19-2016, 03:29 PM
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Quote:
Originally Posted by Foxtrot4 View Post
Do the 1st Gen (F4) bikes have this also?
This began with Euro 3 specification...so depending on year model, Yes.

I used to be fast....now I just dream about it.
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post #7 of 40 (permalink) Old 12-19-2016, 03:32 PM
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Quote:
Originally Posted by hogget View Post
i'll pull the tank off again and check whether other things are blocked, the plumbing is still there
If the plumbing is all there and not blocked off then you are getting dirty air into the exhaust ports with the possibility some will be pulled back into the cylinder with reversion affect during overlap (sound wave pushing escaping fresh mixture back into cylinder as intakes open and exhaust close).

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post #8 of 40 (permalink) Old 12-21-2016, 06:33 PM Thread Starter
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i haven't got back to the garage yet, but after looking at the parts diagram, i'm a bit confused
the line from the air box goes to the solenoid and from there 2 lines go to inlets with reed valves on top of the valve cover
how does any air get from the valve cover into the exhaust port?
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post #9 of 40 (permalink) Old 12-21-2016, 08:08 PM
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Quote:
Originally Posted by hogget View Post
i haven't got back to the garage yet, but after looking at the parts diagram, i'm a bit confused
the line from the air box goes to the solenoid and from there 2 lines go to inlets with reed valves on top of the valve cover
how does any air get from the valve cover into the exhaust port?
The valve cover is a go-between for holes that go through the cylinder head to the exhaust ports.
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post #10 of 40 (permalink) Old 03-04-2018, 01:21 PM
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Does someone knows the internal diameter of the hoose attached to the head cover?

I want to machined 2 cylinders and put it into the hoose

Last edited by ecosmeri; 03-04-2018 at 01:24 PM.
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