[Incioit22]

So, at risk of beating the ole dead horse, I still am unclear about an issue or two with this upgrade. I have 2014 250L loaded with upgrades and now a stock 2017 Rally which I’ve decided to be my keeper CRF.
I have several other bikes: multiple KTM XCFWs & a 250R. But the CFR is a great bike for what it is and the Rally version puts me in the right direction. So I want all the upgrades from the ‘14 put on my ‘17 Rally. To start, the 2014 upgraded 250L is strikingly snappier then my original 2017 250L. I was very surprised and loved it-until I saw the Rally!
So first Q is about thus O2 sensor. I am not against keeping it bu installing a bung/mount on t(e existing FMF system that doesn’t have it, but I’m thinking I’d like to try it out first. I agree the Rally has a nice quiet wisher as she flees through the woods, I kind of like it, but the increased performance I have between my 2 250Ls is quite impressive, so can I bolt it on along with the tuner and try it or will this “Limp Mode” be an issue? I’m planning on swapping out the exhaust, rad guard ( minor alteration), CR high bars, mirrors, seat, AMG battery, shock links, rear fender rack, etc. but am most concerned about the O2 sensor and this reportedly resulting Limp Mode. Any definitive thoughts?

[JimDirt]

Welcome to the site !!

Hopefully Leardriver will chime in , as he is the resident carb/EFI specialist around here , he would have the best insight as to what the O2 would do good or bad ... , if the other stuff will bolt on , I do not see a issue with it , and if the exhaust bolts up , try it with out the bung and see how it feels , it may not be exact to the older one , but it might be just fine ..