cbf 125 air box..

[LockyUK]

i did this out of interest https://www.youtube.com/watch?v=U1HCv9S2Axo, is there any downsides to it ?? it looks to me like the only possible reason for that plastic bit is solely to reduce the noise ?? thanks...

[neil.]

It's called a resonator and is meant to reduce air intake noise. Because you removed it, you'll also be sucking unfiltered air into the engine, not to mention increasing the airflow, possibly making the engine run lean unless the fuel injection system compensates by adding more fuel, but then you'd lose fuel economy.
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

[LockyUK]

[neil.]

Unfiltered air and a lean mixture (do you want a hole in your piston?), or at best reduced fuel economy if the FI system can compensate. I would leave it alone.
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

[LockyUK]

[dungbug]

You don't want filtered air getting through chap, you let no end of cack into places you don't want it.
____________________
CBT: Pass 25/06/2011 Theory Test: Pass12/06/2012 Mod 1: Fail 08/07/2012
Mod 1 Retest: Pass 15/0702012 Mod 2: Pass 03/08/2012
Suzuki GN125 (Sold) ~ Current bike: Yamaha YZF 600R Thundercat

[LockyUK]

ok i have ruled that out, now what about this..

it is french btw https://www.honda125cbf.com/topic/2825/la-solution-ultime-admission-directe/start/51/

would this void my warranty, i assume so ?

[Tellstar4000]

Have just done this mod for noise purposes( staying alive) but have adapted it to at least try and protect engine,buy a cheap plastic kitchen sieve,cut a round in the thin plastic mesh big enough to cover hole and go round the outside,then use compression clip which was holding original on to seal around. Tube with mesh over hole and down side.simples,can double up mesh or use inline washing Maschine pipe filter from water inlet feed pipe with tape to secure,at least will give some filtration but increased noise will keep dozy drivers awake,hope helps
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Zzzz

[Rogerborg]

Urgh. Just rip out the whole airbox and slap on a cone filter.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[J.M.]

[bodger]

Tellstar4000, I think what J.M. is trying to say is as follows-
Bodging on a piece of wire mesh over the hole is not going to make any difference to the filtration.
It will still be unfiltrated air getting into the engine.
Also as already been mentioned, the carburation will be adversely affected, giving a weak mixture, possibly resulting in a damaged engine.
Bike manufacturers dont spend large sums of money on developing engines only for someone to come along and "tune" them by sticking a panscrubber in the inlet..
Best advice , leave alone, or, if you must, buy an aftermarket air filter, and if you do that you may still have problems with weak mixtures

[J.M.]

Also that making your bike "louder" by drilling holes in the airbox is not going to make car drivers hear you and therefore be "safer".
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2004 R1 & 2018 XSR900

[Tellstar4000]

Thought it would at least help but have taken your advice and am going to wait till gbmoto exhaught back in stock,no performance gains but at least my son hopefully will be heard and therefore seen.in meantime air filter back to normal
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Zzzz

[neil.bardsley]

[Evil Hans]

Welcome.

Telling us the year of the bike might get a more informed answer.

And not making me read through a ten year old thread to get to your question would make me a lot happier ...

It's entirely possible that the bike is newer than this thread
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Triumph Sprint ST 1050. And it's Red.

[neil.bardsley]

[Easy-X]

Is there an actual problem at the end of this thread resurrection?
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[xX-Alex-Xx]

[Rob Fzs]

[Ste]

[Evil Hans]