EC125 - base line jetting

[doutsh]

Hi,
I have a 2013 EC125, and it's carb is all over the place.
I couldn't find here any information regarding this model.
Can someone recommend a base-line jetting so i'll have a starting point?
I'm riding at about sea level, at temperature of around 20-30 degrees Celsius.
Thanks!

[doutsh]

no one owns a 125?!

[Elvis74]

Pilot jet 50
Main jet 188
Needle n1eg
Air screw 2 turns out

Winter

Pilot jet 55
Main jet 195
Rest remains the same

Plus minus individual settings

[doutsh]

Thanks, I'll try that!

[Todd5774]

So reading those settings, is it a rule of thumb that the smaller the engine the fatter the jetting?

Only reason I ask is that I went leaner when I converted the 300 to a 250..

[Elvis74]

Yes that's right, small engines require a rich jetting! But only when using the same carb size.

[Anders]

Originally Posted by Elvis74

Yes that's right, small engines require a rich jetting! But only when using the same carb size.

A smaller engine does not run fatter, it just needs a bigger jet to obtain the same mixture compared to a bigger engine. I guess this is due to the lower cylinder volume creates a lower gas velocity thru the carb.

[Elvis74]

That's right!
Ans I don't meant that the engine must run fatter, I just mean the jetting compared to bigger engines. Less air flow in the carb requires bigger jets to gat the same amount of fuel through.

[Zman]

If you get tired of jetting the 38mm you can always drop in a kx125 35mm PWK carb and be finished. In my opinion a 38mm is too large for a 125 woods bike. This posting provides more details.

http://www.gasgasrider.org/forum/showthread.php?t=17919

[Elvis74]

I never had any issues with my PWK38! And since I have build it up to a 144cc I doesn't even think about my carb. I my opinion it works great, but I am more riding on motocross track or fast enduros. In Germany riding in the wood is not legal.