Athena factory kit jetting help

[ZeroLogic]

Well since its a bike...

I just ordered a Athena Factory kit from Motosport. I'm going from a 134, port and polished head to a 125 kit. My main jet size is 420, and for thepilot jet its a 35. I'm at 1355 feet as well. Any help would be awsome. The bike is a 03 Yz125 with a FMF SST, FMF Shorty exhaust and a No-Toil air filter. I just want to get her together so I can ride! I havn't rode since I went to Walden in Ny on Nov 11 of 07 and I am turning blueeeee.

Thanks!:macho

[CSR400EX]

i had almost the same mods on my 03 YZ125, and it had the stock 410 in it. plug checked it a couple of times and it always looked good. i would try the 420, break it in and do a plug check and go from there

[ZeroLogic]

410 is a bit big isn't it? :confused:
Also does anyone know the stock size main jet?

[ZeroLogic]

Bump.:ermm:

[CSR400EX]

according to the 03 manual i still have, 410 is the stock main jet.

[ZeroLogic]

Alright bro, I'm going to stick the 420 jet in there and see how it is. Thanks a lot!:macho