CR 134 build lacks bottom end power?

[Todd D]

I rode a friends fresh CR 134 national level build and the bike did not have any bottom end and would fall on its face when going from 2nd to 3rd gear. Needless to say something is not right.  

The jetting seems to be spot on so I'm 99% sure it's not the jetting.

420 main

48.5 pilot

air screw 1.5

clip in middle

Has anyone experienced issues with a big bore CR 134?

Thanks!

 

[Into the sunset]

If you're used to a 450 it could just be the difference from the two. I know this from experience. It could also be the power valve not hooked up properly. I learned that the hard way on my kids 06. 

Edited September 18, 2017 by Dklassen

[Motox367]

Pro doesn't need bottom end doesn't ride it there

Edited September 18, 2017 by Motox367

[Todd D]

14 hours ago, Dklassen said:

If you're used to a 450 it could just be the difference from the two. I know this from experience. It could also be the power valve not hooked up properly. I learned that the hard way on my kids 06. 

No, no one was riding a 450.  If you compare it to my sons 17 modded YZ 125 it's a dog.  Under a load it will fall on it's face.

 

Hopefully he will figure it out on the phone with the builder.

[Todd D]

14 hours ago, Motox367 said:

Pro doesn't need bottom end doesn't ride it there

It flattens out on top requiring shifting.  When you shift it falls on it's face. 

My sons YZ 125 is stronger everywhere.

 

[frdbtr]

He has a mechanical problem.  It is probably related to the powervalve being stuck open or something.