YZ134 vs YZ144

Sweet!

That 134 kit is on my wish list in the future.

Interesting how they thought the 134 handled better due to the power characteristics...

MXA kills it on some things and just look like complete idiots on others. This was a really neat idea and cool to see.

The 139cc on the YZ's works way better than the 134 or 144 IMO.

Back in the early 2000's, when I was still racing a 125, I put a 137 RPM big bore kit in my YZ. It was great, but I had one hell of a time jetting it. At that time 137cc(maybe 139, RPM didn't offer that size) was the largest displacement I could run legally in the 125cc class.

I have a YZ144 and love it. I'm a Vet B riders and love how I can push the bike. My days of trying to be a Pro are so far gone. Riding for me is all about having fun with my buddies. And holy cow the Athena YZ144 kit is fun. I never have to worry the bike is going to get out of hand, and instead of managing the 450 power, I'm able to push the bike. Don't get me wrong, it is a lot more work then a 450 to ride, but it is JUST SO MUCH FUN. Best part is chasing down and passing my buddies who are on 450's.