2018-19 Beta 125RR

[Betabandit]

Does anyone know if a KTM 125 top end kit is interchangeable with the Beta 125?

[Dirt Dud]

Really not sure if it would since Beta makes the motor . But why would you want to change it anyway ?

[Betabandit]

I guess I may have stated this wrong! My intention is when the bike needs the top-end freshened up with a new piston, rings and gaskets, will the KTM parts fit. I don't really plan to change the cylinder or head. My reason is because I can get the top-end kit for the KTM at 1/2 the price. I know some parts are interchangeable on the 300's but I didn't know about the smaller cc bikes. Just curious.

[Dirt Dud]

I just bought a new 125 and that is why I was interested . I do not care about the cost but will be looking for more power no doubt . I need for this weather to clear up and get warm . In the meanwhile I am riding my trials bikes .

[typeone]

ProX lists the piston for a 2019 Beta 125RR as a KTM 125 piston so it looks like there might be a crossover.

i'm running a cast ProX KTM piston in my 250 without issue.

when searching for 2019 Beta 125RR i get the following parts list back on the ProX site:

prox-beta-125-piston.png (40.58 KiB) Viewed 4933 times

[Hyde]

The bore is 54 on both but the Beta piston is a two ring and the aftermarkets are single ring, (that Iv'e seen anyway)