Is 180 to big?

**maynard22** · 05-13-2005, 09:43 AM

I have a T4 slip-on, fmf headpipe, KandN filter, Airbox with holes cut in the lid. I took the bike to a local shop and he put a 180 jet in it and I have not been able to ride it and won't be able to ride it until Memorial Day weekend and I was just wondering if anyone has an opinion if this is to big or not. I live in Oklahoma and I have no idea what elevation i am at here. My bike is a 2002 400ex.

**sickmojave** · 05-13-2005, 09:50 AM

I would think that it's going to be way to rich.

**maynard22** · 05-13-2005, 09:53 AM

Any suggestions on what I should run it at.

**bwamos** · 05-13-2005, 09:54 AM

Aye, the common concensus is that a 400ex w/ aftermarket pipe, K&N air filter, w/o airbox lid is going to run between a 152 & 158 main jet.

Just do a search for "400ex main jetting". I'd use jet but 4 letter min on search.. lol.

**Chino886** · 05-13-2005, 09:55 AM

Are you going to be at the Little Sahara on Memorial Day? I think I am running a 155/45.

**smith_400ex_213** · 05-13-2005, 09:59 AM

if it runs how u want it to on top end dont mess with it...number dont mean much..just play wiht it untill it runs good...temperature and altiude plays a role too...

**duke416ex** · 05-13-2005, 10:17 AM

I have heard ppl say that some brands of jets are actually different sizes, but 180 sounds way to big. I have a t4, k&n, ported header, full p&p and a 416 kit and I run a 165 and I think I am a little rich.

**maynard22** · 05-13-2005, 10:35 AM

chino886 yes I will be at Little Sahara from saturday morning until monday afternoon, staying in the south campground, pulling a trailer with a big ***** ugly OU Sooner helmet on it, it's a buddies trailer and it is alot better than hauling the bikes on the little trailer I usually use.

**maynard22** · 05-13-2005, 10:39 AM

The bike starts up alot better with the 180 in it and seems to rev better when just sitting there, is this any indication that the jetting is alright? I know nothing about the carb part of things so if these comments and questions are stupid I apologize in advance.

**sickmojave** · 05-13-2005, 02:30 PM

the main has nothing to do with the way it starts. the only way you will know if the 180 is to big is to take it for a ride and check the plug.

you're not that far from me and with the stuff in my sig and 4~1" holes in the lid I run a 155 and it works great. I tried a 160 and it was to much.

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