Honda CBF 500 -04 (twin)

[Just in Case]

Hi there I bought this Honda CBF 500 -04 It has Air Injection (in front of the engine) I have tried to find out how this is working / its purpose . I have had no luck !
Anyone ?

Br Just in Case
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To ride or not to ride?
That is a stupid question !

[MarJay]

I think it's an emissions control thing. As I recall it just injects fresh air into the exhaust so that when the bike is submitted for emissions tests, the tailpipe emissions look better than they otherwise would. I've found a few threads about removing it and it generally seems to improve rideability and power, but I don't know if a dyno setup is required for the full effect or not.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Just in Case]

Beautiful MarJay.
Spot on !
Thank you!
I`ll just leave like it is, very pleased
Take care and enjoy
____________________
To ride or not to ride?
That is a stupid question !

[Paddy Blake]

Sounds like it's the same as the system that was on the Hornet 600. It's called the PAIR system. Pulsed Air Intake Reed.

[RhynoCZ]

I had the emissions regulation system on the CB-1 and my mate had it on his FMX650. I've bought the CB-1 with the system already removed. The previous owner just took everything off and blocked two exhaust ports comming out of the head by conecting them with a hose, no tune up, no dyno testing. The bike ran great and suspiciously fast (198km/h GPS).

Now, as for the FMX650, i had a go on it before and after my mate removed the system and after removal the engine just felt more responsive and livelier. No tune up, no dyno testing required, although fidling with the mixture could result in a bit better performance, as he efectively removed a restrictor.

NOTE: In CZE motorcycles are exempt from the emissions testing for the MOT, also in CZE motorcycle MOT is good for 4 years.

This kind of thing. Those bottom pipe bits mount to the head (exhaust side) and on my CB-1 those pipes were cut off and connected with a hose together by the previous owner. That hose melted away twice in the first year of riding the bike, so I later on I had a friend of mine weld thouse pipes shut creating perfect plugs.

https://motorradteilehannover.de/media/image/product/279392/lg/honda-cbf-500-a-pc39-2004-luftansaugventil-a5440.jpg
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Fullers1845]

Those secondary air systems are fairly common, the gist of it is that allowing a bit of air into the exhaust will theoretically encourage more complete combustion of the exhaust gases.
I had one on my ZX6R that ran between some reed valves on the rocker cover and the airbox, but it had a vacuum valve that was supposed to open and shut depending on the vacuum level. The valve was knackered plus all the rubber gubbins just gets in the way when working on the bike so I just removed and plugged everything up.
Only difference I noticed was that the bike used to occasionally give a few pops when rolling off from high revs and full throttle, and now it doesn't.
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Honda CB125F, Kawasaki ZX6R J1, 1922 Sheffield-Henderson Blackburne grasstrack/sprint

[PotatoHead202...]

It's a PAIR system.

Just remove it and blank it off. Much more room to work on the bike.
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Suzuki V Strom 1050XT, Honda CBF500 ABS,