Rucka,
In regards to the post below.
"Any good feedback on this build package they offer. pros and cons of going 134 vs 144? looking to add a little pep in my 125s step. Any reliability issues?"
We have at least 6 YZ125s currently; stock, mod / ported, 134, 144. The 134 & 144 build details can be found here;
https://motocrossactionmag.com/mxas-yamaha-yz134-vs-yz144-big-bore-challenge/
or here
https://www.youtube.com/watch?v=SEkFsK8Hxn8
Our 2 cents on the 134 vs 144;
The 144 has been my go to since 2017 (I recently switched to a YZ250), 144 has good low, mid, and still pulls some up top, but signs off sooner then the 134, or even stock 125s. This set up was easier to tune then the 134. The 144 will pull a taller gear and let you make a mistake without feeling like you just dropped anchor.
134 is all mid to top. Has been harder to tune and we have since put a SmartCarb on it. If you arent really good at rolling corners, maintaining momentum, or your tracks are tight, the 134 is going to require more attention with the clutch then any of the other options.
Reliabilty; all OEM internals combined with the full Hinson kit is a must. Stay away from aftermarket bearings, cranks, whatever.
The best all around / reliable motor (for us) has been the stock or ported 125. I hope this helps. Let us know if you have questions moving forward.
MC
Yoshimura is the tip of the spear. They have been an integral part of some of the best programs in 2 wheeled racing. Product quality and fitment for us has always been better then any of the other exhaust brands. We love running Yosh labels on our 2 stroke silencers, that always stirs the pot. Merry Christmas!
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