TRX250R.ORG

Workshop => Engine and Bottom End => Topic started by: pantera1975 on December 06, 2013, 09:30:02 PM

Title: Jetting from 80 deg to 20 deg weather
Post by: pantera1975 on December 06, 2013, 09:30:02 PM

I have a trx 9 ESR motor in a ATC with a 39 mm Keihin carb. Is it common to have to raise up the needle or use a richer one. How much should I start with changing the slow and main jet?

Title: Jetting from 80 deg to 20 deg weather
Post by: supernutt on December 06, 2013, 09:42:32 PM

I usually raise the needle 1 clip and up the main jet.  Ran a 192 this summer and currently running a 200 in freezing temps.  I always figured 1 main size for every 20 degrees in temp change.  Never really mess with the pilot...Just the air screw a little..

Title: Jetting from 80 deg to 20 deg weather
Post by: rk88r on December 07, 2013, 10:34:59 AM

I do about the same as Supernutt. Just raise the needle a clip. I did buy a ecg to experiment with this winter, in the past I've run a dej one up. It's so damn cold now the R is staying in.

Title: Jetting from 80 deg to 20 deg weather
Post by: Bigred on December 07, 2013, 06:24:24 PM

I just kick it over and run it lol

Title: Jetting from 80 deg to 20 deg weather
Post by: The_Steve_Man on December 07, 2013, 06:48:17 PM

It was 16 here today. No 2 stoke riding today. But very good information

Title: Jetting from 80 deg to 20 deg weather
Post by: supernutt on December 07, 2013, 06:57:46 PM

I had about 22 degrees and it was awesome!!  Went out for a hour ride.  No snow and frozen ground. Cant tear anything up and quad really goes on frozen soil.