Tag Archives: YZF-R125 general tuning

YZF-R125 injector swap

So there’s been a few discussions on the forums recently about different injectors, and I happened to film when I swapped my injector over so figured it might be useful.

It’s a pretty straightforward process…as long as you don’t mess it up.

At which point it would become very complicated. So really don’t do that.

I have a theory – that on a stock R125 which has perhaps a slip-on ((or full exhaust) and a K+n filter, that a 120cc/min injector would make a really cheap, convenient upgrade.

When mine was tuned like that the fuel map was adding about 20% across much of the map. Not all of it but enough for it to potentially make a difference where it matters.

And here’s the link to the 120cc/min injector. As far as I’m aware stock is 100cc/min, so that would give you a 20% bump across the range.I’ll just leave this link here: https://www.aliexpress.com/item/32921…

My problem currently is that I don’t have a stock bike to test the idea on…though I’m hoping i’ve found a volunteer. Watch this space 🙂


Fitting an extra temperature gauge to the YZF-R125

[I’m also moving this from the R125forum while there’s issues with it].

Some pics from fitting the temp probe and other randomness…

the temp probe.. it’s in what I believe is the return pipe for the radiator so whilst it’s not quite as good a location for temp as the main temp sensor, I haven’t got a reading from that and won’t have till I have the POD-300 controller/display so this is the next best thing and should tell me if she’s having a meltdown…

here’s my replacement section of pipe to replace the coolant pump return..hopefully it fits in the space.

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