[Slowblue]

I have a XT125r that's covered a high milage, I think at some point a refresh will be in order including what I imagined would include a new piston & existing cylinder rebore.
Looking online there seems to be loads of new cheap pistons & barrels for sale, what's the consensus on their quality, are they any good or to be avoided? Anyone used one & have decent milage on it?.
I'm sceptical of a piston, cylinder & gasket kit that costs less than the price of the machine work alone for a rebore!

 

[Bweighmaster]

Cheap usually ends up being more expensive than using proper OEM parts .... Have you checked Wiesco ?

 

[Slowblue]

Cheap usually ends up being more expensive than using proper OEM parts .... Have you checked Wiesco ?

It looks like OEM & Wiesco aren't options, that's why I'm curious if anyone has experience with the no-name stuff.
I've searched online & some of the two stroke enthusiasts (who go through more pistons 😄) have had good & bad results, I suppose that sums it up really, roll of the dice...... especially when non branded means you can't even be sure you're getting what someone else found to be OK.
If I could find a known quality oversize piston I'd probably go that route, I'll ask around locally starting with the local engine machine shop.

 

[Bweighmaster]

Check to see if TTR 125 Piston is the same .... 57mm bore ?

 

[Tinsnips]

Maybe if you are having an engine shop machine it have them supply parts and therefore a warranty on them, regardless of how small.

As BW mentioned above, cross reference the size and investigate OEM or Wiseco parts that are the same.

 

[Slowblue]

Check to see if TTR 125 Piston is the same .... 57mm bore ?

XT125 /YBR125 are 54mm X 54mm bore/stroke.

I've been looking at used motors, it's another option & maybe a better one as they are still being made & the only difference is fuel injection (& maybe ignition?), and going that route gets newer everything.....
I looked at a very clean low milage 2017 engine today still in a YBR, my XT is 2006 & although the carb manifold is a easy swap with the FI manifold I imagine I'll also maybe need to swap the flywheel because of different ignition?.... and maybe something I haven't thought of yet! The 2017 doesn't have a kickstart, that can either be swapped or forgotten about..... not too bothered.
I'm not sure about any of this & I'm still looking at the various years parts diagrams to try & work out similarities & differences.....

 

[Slowblue]

So.... for anyone following this or searching in the future I've bought a used engine out of a 2015 YBR125 to use in my 2006 XT125.
From parts lists the Camshaft appears the same. The inlet manifold & exhaust appear to be a straight swap.
Right now I'm not sure where I am with the spark & charging ~ flywheel & stator so will update this when I know for sure.
Any info appreciated. 👍

Hopefully it won't be too much of a chore to swap & then I can see what the original engine needs under no time pressure & have a spare.... or that's the plan..

 

[Bweighmaster]

Should match up ....

 

[Slowblue]

Should match up ....

Not the stator / flywheel, it's different but don't ask me to explain other than 2006 has nine windings & the 2015 has 18 & a different looking flywheel.

I'm just going to swap the flywheel & stator (Inc engine cover) to get things running then work out what's needed to use the newer stator as I assume it's a better output.