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Ybr 125 limits at 5000 rpm

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Defuzze360
L Plate Warrior



Joined: 23 Apr 2020
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PostPosted: 02:44 - 23 Apr 2020    Post subject: Ybr 125 limits at 5000 rpm Reply with quote
hi, I've been working on my personal bike that I use for work as I'm a delivery driver and need it for work, it's a ybr 125 2008 fuel injection but I'm having a problem with it.
I've recently bought a lextek yp4 exhaust which is said to be made for my model of bike but after installing it and going for my first ride with the new exhaust the bike will not go past 5000 rpm and maxed out at about 35 mph could anyone shed some light on what the problem could be, much appreciated.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 09:11 - 23 Apr 2020    Post subject: Re: Ybr 125 limits at 5000 rpm Reply with quote
Defuzze360 wrote:
hi, I've been working on my personal bike that I use for work as I'm a delivery driver and need it for work, it's a ybr 125 2008 fuel injection but I'm having a problem with it.
I've recently bought a lextek yp4 exhaust which is said to be made for my model of bike but after installing it and going for my first ride with the new exhaust the bike will not go past 5000 rpm and maxed out at about 35 mph could anyone shed some light on what the problem could be, much appreciated.


Usually if you change the exhaust you need to rejet or remap it.

Either contact the exhaust manufacturer and ask them the recommended setting, pay to stick it on a dyno or pit the original exhaust back on.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050
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Easy-X
Super Spammer



Joined: 08 Mar 2019
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PostPosted: 12:49 - 23 Apr 2020    Post subject: Reply with quote
And then you go down the rabbit hole of also looking at your air intake...
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 13:13 - 23 Apr 2020    Post subject: Re: Ybr 125 limits at 5000 rpm Reply with quote
Defuzze360 wrote:
ybr 125 2008 fuel injection ... lextek yp4 exhaust which is said to be made for my model of bike

Is it this one?

https://www.lextekproducts.com/EXHKIT247.php

There is another one:

https://www.lextekproducts.com/EXHKIT1278.php

Note the "important information" and "compatibility" details.


No idea whether this could be the issue, though; is the "Euro" emissions rating right?
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Defuzze360
L Plate Warrior



Joined: 23 Apr 2020
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PostPosted: 15:19 - 24 Apr 2020    Post subject: Reply with quote
Hi thanks for all the replies, I've took all into account and I've tried changing the air intake and it's improved by a small margin, so will now revs to about 6000 rpm so I'm thinking that it's the fuel that needs adjusting just wondering how I'd do that on a fuel injected bike thanks.
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 16:34 - 24 Apr 2020    Post subject: Reply with quote
Defuzze360 wrote:
Hi thanks for all the replies, I've took all into account and I've tried changing the air intake and it's improved by a small margin, so will now revs to about 6000 rpm so I'm thinking that it's the fuel that needs adjusting just wondering how I'd do that on a fuel injected bike thanks.

How have you "tried changing the air intake"?

I would be inclined to talk to whoever you got the exhast from, as someone said before, they should know whether modifications are needed.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 17:26 - 24 Apr 2020    Post subject: Reply with quote
Defuzze360 wrote:
Hi thanks for all the replies, I've took all into account and I've tried changing the air intake and it's improved by a small margin, so will now revs to about 6000 rpm so I'm thinking that it's the fuel that needs adjusting just wondering how I'd do that on a fuel injected bike thanks.


It's called remapping.....
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050
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WD Forte
World Chat Champion



Joined: 17 Jun 2010
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PostPosted: 18:57 - 24 Apr 2020    Post subject: Reply with quote
As the stock EFI ybr has an egr takeoff at the downpipe silencer junction
and this new zorst doesn't seem to have that
What have you done to the egr stuff?
If its been left flapping in the breeze i wonder if it it might be sucking too much air in?
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