KTM TBI 2 Stroke 125 Rebuild! || 2023 KTM 125 XC/SX

[@ehess8845]

Thanks for taking the time to put this together...sorry if I missed it, but how many total hours on that cylinder and how many on that top end? Crank is still original? Also, is that deck height tool domed or is it just a straight edge? Thanks!

[@ryanboening]

@@ehess8845 this cylinder had about 100 hours at this video, second piston. Original crank. Deck height tool is flat

[@themotocrossmodchannelWulfMX]

Thanks Ryan, great job!

[@ryanboening]

Thank you!

[@chasemotocross3554]

Super good video appreciate all the detailing

[@ryanboening]

Absolutely! Thanks for checking it out

[@FaizWhimantaka]

What oil do you use? And how much premix ratio?

[@ryanboening]

@@FaizWhimantaka motorex, but you can use what you’d like, as long as it’s injector safe. 40:1

[@jdm1200]

Curiosity on my part but at what hour did you do the first top end. Also is there a reason you didn't clean the power valve?

[@ryanboening]

@@jdm1200 First top end was at 55 hours, the piston looked pretty decent but the rings were really starting to wear. I didn’t clean the power valve because I didn’t think it needed to be cleaned. It wasn’t too bad at around 110 hours when I rebuilt again and cleaned the power valve.

[@jdm1200]

@@ryanboening I'm an old big vet rider but I sure love my 125. I think I enjoy it more than my 300.

[@ryanboening]

@@jdm1200 they’re a blast for sure!

[@JustinDiPrizito]

Would this video be applicable to a gg 150 mc 2025?

[@ryanboening]

@@JustinDiPrizito yep. Same design, but you’d need to check deck height differently, not sure exactly the value for it. As long as it is just slightly below the top of the cylinder you’re probably good

[@JustinDiPrizito]

@ thanks a lot

[@crispy4942]

where did you get the user manual from

[@ryanboening]

www.wulfmx.com/products/ktm-service-manuals

[@damonreliga3129]

How are you using a longer spark plug? Won’t it hit the top of the piston?

[@ryanboening]

That’s a good question, if the plug is a lot longer yes, but this plug is just a bit longer. Assuming it mostly helps to be more in the middle of the compressed mixture for a faster and better spread of combustion.

[@AtMortenJ]

threads are the same height, so it wont go further in cylinder head

[@ryanboening]

@@AtMortenJ yes, but it will go further into the cylinder, just a tad since the end part is a little longer

[@moniteurvttraymondorre8202]

What’s the brand of TPS tools, please? Where did you get it from?

[@ryanboening]

@@moniteurvttraymondorre8202 www.wulfmx.com/products/tps-tool This is the one I am using in the video, you can also purchase just pig tails so you can use a multimeter. But it’s a little tedious using pigtails