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Discussion Starter · #1 ·
Hy guys,

I have a question regarding the YZF R125 2021 EU5 model.
It is equipped with a lambda sensor. So my questions is, is it able to adapt my planned mods, BMC replacement air filter, Shark SRC-4 complete exhaust and NGK CPR8EAIX-9 spark plug? Or will I run in problems? Any experience here?

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Thanks a lot,

Nils
 

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Discussion Starter · #3 · (Edited)
After driving around for now appr. one week I can say everything works fine. I think I have a slightly better response and it revs a little quicker up when the VVA system is active. But it can be also only a subjective feeling as the sound has improved a lot. I´m happy with it, even I run it with the DB-eater.


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Hy guys,

I have a question regarding the YZF R125 2021 EU5 model.
It is equipped with a lambda sensor. So my questions is, is it able to adapt my planned mods, BMC replacement air filter, Shark SRC-4 complete exhaust and NGK CPR8EAIX-9 spark plug? Or will I run in problems? Any experience here?

View attachment 34028 View attachment 34029

Thanks a lot,
So, we can confirm your exhaust and air filter caused no issues, bike doesn’t run lean and even feels slightly quicker ?

I’ve fitted a for Scorpion exhaust, but have been holding back fitting the K&N for fear it will cause issues on my 2022 R125 60th Anniversary
 

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Discussion Starter · #8 ·
So, we can confirm your exhaust and air filter caused no issues, bike doesn’t run lean and even feels slightly quicker ?

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Yes no issues so far. Did now more than 5,000km with this configuaration, There are no flat spots and I think the lambda controller does a good job. Perhaps it is also a little related to the Iridium spark plug as it is able to handle a wider lambda range, espacially in the lean direction. All issues regarding the K&N air filter I found in the net are about the cone-filters, that are directly attached to the throttle housing. But I used a replacement filter in the original closed housing.
If there is a real power add, I can`t swear. Much is coming from the better sound. But I´m 100% sure there is no power loss with this configuration.
 
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