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YZF R125 airbox mod??

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KevShek
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Joined: 08 Oct 2006
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PostPosted: 07:30 - 23 Apr 2009    Post subject: YZF R125 airbox mod?? Reply with quote
Hi all, I'm sure I accidentally found a topic relating to the above but can't seem to find it. Can anyone point me in the right direction pease?
Is there an ongoing threar regarding tips and tricks for this bike? Perhaps we could start a one for those who hav e done various things to help improve the bikes responce.
Thanks
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Joined: 29 Sep 2006
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PostPosted: 08:16 - 23 Apr 2009    Post subject: Reply with quote
Just done a quick google for you:

yzf forum wrote:
on the side where oil filter is located you have to remove the fairings, once this is done you wil see a pipe coming from the exhaust it conects to a little black box and you have to remove the 2 pipes running from it, then undo the 2 screws holding it together, and you will see a kind of diafram inside, i found a metal plate in there and was restricting the ammount of air going through it, so i adjusted the metal plateso the diafram opened fully to let more air into the airtake system. once all back together i tested it out and the results were not massive but very positive on respose and made it ride quicker than it was, and the top spped i had with oncoming wind was 85mph @10,000.
before doing this i was doing 83mph @10,500 rpm so allthough not massive but more responsive and a good find for everybody.
also removed the exhaust and there was not restricton on this apart from the cars, which when i get full system will make it even better.


Taken from This forum.

Could be a load of bollocks aswell as most people in that thread seem to be little chav's Laughing


(edit: you didn't get rid of the nsr for this did you? Shocked )
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ms51ves3
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Joined: 07 Jun 2007
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PostPosted: 08:46 - 23 Apr 2009    Post subject: Reply with quote
justmetoo125 wrote:
Just done a quick google for you:

yzf forum wrote:
on the side where oil filter is located you have to remove the fairings, once this is done you wil see a pipe coming from the exhaust it conects to a little black box and you have to remove the 2 pipes running from it, then undo the 2 screws holding it together, and you will see a kind of diafram inside, i found a metal plate in there and was restricting the ammount of air going through it, so i adjusted the metal plateso the diafram opened fully to let more air into the airtake system. once all back together i tested it out and the results were not massive but very positive on respose and made it ride quicker than it was, and the top spped i had with oncoming wind was 85mph @10,000.
before doing this i was doing 83mph @10,500 rpm so allthough not massive but more responsive and a good find for everybody.
also removed the exhaust and there was not restricton on this apart from the cars, which when i get full system will make it even better.


Taken from This forum.

Could be a load of bollocks...


It's definitely bollocks as he says he got 2mph more top speed 500rpm lower Laughing
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PostPosted: 08:49 - 23 Apr 2009    Post subject: Reply with quote
ms51ves3 wrote:

It's definitely bollocks as he says he got 2mph more top speed 500rpm lower Laughing


Someone in that thread mentioned it doing 125mph aswell Laughing
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KevShek
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PostPosted: 10:05 - 23 Apr 2009    Post subject: Reply with quote
I've read on another forum about turbocharging! Using the worlds smallest turbo. Its about the size of a coke can. Tbh the bike simply isn't geared up for that even if you manage to fit one. It would be screaming its tats off!
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KevShek
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PostPosted: 11:28 - 23 Apr 2009    Post subject: Reply with quote
ive now had a chance to read that post now.
From what i can tell, its talking about the valve system which connects to the exhaust. Ive just had my bike back from 1st service and i asked about that box. I was told its an air circulation system, where air is taken from the airbox and piped out directly into the exhaust. When asked what the purpose was for, its so fresh air can bypass the engine, out into the exhaust, for a cleaner emission result.

So from what i can tell, modifying it wouldnt help the bikes performance.

I was also told that some aftermarket exhaust wont have that feed into the exhaust, so you would simple disconnect the rubber tube and blank it off anyways.
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Kickstart
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Joined: 04 Feb 2002
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PostPosted: 11:31 - 23 Apr 2009    Post subject: Reply with quote
KevShek wrote:
So from what i can tell, modifying it wouldnt help the bikes performance.


Getting rid of it can help slightly (and make it rather easier to get the fueling right), just don't expect large increases.

There are 2 reasons for similar systems. Either to feed fresh air into the exhaust and complete combustion, or to feed exhaust gases back into the engine to reduce combustion temperatures (reduces the emissions of oxides of nitrogen).

All the best

Keith
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KevShek
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PostPosted: 13:46 - 23 Apr 2009    Post subject: Reply with quote
Thanks keith, I've spoke to yamaha technical and they have confirmed that the purpose is to route fresh air into the exhaust system for a cleaner reading.
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Pete.
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PostPosted: 16:19 - 23 Apr 2009    Post subject: Reply with quote
Turbocharging one of them would be a piece of cake. I started doing it for a guy but he got cold feet.
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KevShek
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PostPosted: 16:35 - 23 Apr 2009    Post subject: Reply with quote
Now with the power commander application, I agree, it wouldn't be too hard. Plus using a bigger injector with the PC would be a breeze too. My only concern would be the oil feed abd return. On a bike engine, especially one I'm not familiar with, I wouldn't know where to start. Give me a car and I'd figure that out
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Old Thread Alert!

The last post was made 16 years, 82 days ago. Instead of replying here, would creating a new thread be more useful?
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