Help.. Jetting problem?

S

Stefan Baele

New member
Bike year & model = 2001 enduro ec300 (2stroke)
Temperature Celsius = 0 - 30
Elevation =0-1000meter
Main jet = 182
Pilot jet =40
Needle & notch =n1EF notch = clip on highest point( needle lowest)
Air screw setting =2,5
Throttle valve/slide =7

results: from 0% to 40 % trottle the engine responds well .
if i go from 20a30 % trottle to WOT the rpms goes up but... it takes a 2 or 3 seconde to reach max rpms !it s like i should pull THE chocke a little bit up when i open THE trottle
when i close the trottle then and open it again right away,then it works Great,straith to max rpms.if i let HIM idle for 15 Seconds i got THE same problem again..
i gues he is to rich ???
Sombody Any suggestions for my what i should change first?
Pilot jet ?
I tryed THE needle clip 1 groove down but That is even worse
The owner before me did trial tracks with this bike..

Thanx and sorry for my bad englisch.
From Belgium
Stefan
 
If you raised the needle and it got worse, that suggests a rich condition. First, I would try a 178 or 180. Not a huge change, but little steps.
 
Yes, he was to rich! :-)
I changed the pilot jet from 40 to 35 and also changed THE main jet from 182 to 165
I got THE main jet laying around... Now he Goes fine. No more problem when riding slow and open THE trottle full , he shoot to max rpm without Any problem and fast.
Now its a task to find THE biggest main jet he could run..without THE problem return

If i try THE main jet of 182 i got THE issue again but just a little bit..
I Will try a 175 main jet?
Will iT make a big diffirence from 165 to 175 main ?becouse he is driving smooth now...but i wanna be sure i gotTHE best jet... :)

Thanx for your advise ggrider
 
Ok, those are not little steps! :eek:

Try a 175. Buy a 178 if you can. I'm positive the 165 is going to be too lean. Don't use it for very long, or don't ride hard if you do.

Then try a N3EG needle! The likely reason you felt the need to go to a 35 on the pilot is because the needle is too rich.. The straight section of the needle (denoted by the last letter, F, G, H, W, etc) plays a significant part in the idle circuit. The stock N1EF is too rich all around.

I would not recommend the 35 pilot. It might respond really crisp but will generate excess heat and not have as much power. I am currently running a 42 pilot and 175 main. Currently testing a N3EG at the behest of another user here.
 
Thank you for the good info.
I Will change the needle asap.
And hope it will fix my problem.
And i Will change THE pilot back to 40

A 175 main is in the carb now and a 35 pilot And he is stil a little to rich at WOT

Cu later
 
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