Oct 8, 2006
24
0
HEllo I am waiting on the 05-06 athena 144cc big bore kit in the mail for my 2005 YZ125. I am wondering if

(1.)I am going to have to mod my case to fit the new piston? or if the mod is needed or what. And any tips on how to do so i dont screw it up myself. ;)

(2.)I have a pro circuit pipe and silencer and v-force reed cage. I have read on the forums of some people saying that the 05 didnt need jetting mods but some people say they do. So I'm asking for any opinions...

Any help would be greatly appreciated. :)

TREVOR
 

bclapham

LIFETIME SPONSOR
Nov 5, 2001
4,340
0
if it needs crankcase mods, you can seal off the bottom end with putty or something and go in with a dremmel. I havent seen that kit, so they might have done an offset bore but you will just haev to wait and see.

as for jetting, yes, i am sure it will change, but there is no wayof telling in which direction.

dont forget to give us feed back on the kit.
 

GRP

Member
Oct 14, 2005
6
0
I have the kit and yes, you do need to mod the cases. Not sure yet about the jetting. I have Al Posey working on it now. Currently it has an Eric Gorr 144 top end and the jetting was close.
 
Top Bottom