EC300 dies slowly at idle when warm

[Mikeyx]

Well, the headline pretty much sums it up.

Pilot jet is #35, and neither of the setting screws (idle, pilot air) has an effect on idle speed. Of course, the engine dies if the air screw is wound in.

Don't know if it's relevant to the issue, but the bike is equipped with VForce3 reed valve.

Any suggestions?

[(F5)]

Yeah. Why do you care? As long as it idles for like 3 seconds it won't stall in normal riding circumstances.

But if you have a N1F-anything needle it will run badly at closed to low throttle and small pilots won't help the wet gas blobs being sucked past the too thin needle.

[Jakobi]

Originally Posted by (F5)

Yeah. Why do you care? As long as it idles for like 3 seconds it won't stall in normal riding circumstances.

But if you have a N1F-anything needle it will run badly at closed to low throttle and small pilots won't help the wet gas blobs being sucked past the too thin needle.

This entirely!

The N1EF needle has a super short straight section, and is rich as all buggery on both the diameter and 1st taper. Most people try and bump the idle up and go to a smaller pilot (35) to overcome the richness, but you're then left with a more inconsistent idle and an air screw with little effect.

Have a read in the jetting threads.

[Mikeyx]

Well, there is the N1EF needle in, with the clip in 3rd groove. The bike came w/ also N1EG and CHN (brass) needles.

I changed to #40 pilot jet, air screw 1 out. Now the engine has sluggish and sputtery throttle response up until the opening of the PV when the bike really takes off and has a significantly higher power output than w/ #35 jet. On a 4-stroke, sputtering would be a sure sign of a lean mix...

Another issue: There is a significant misalignment between the carb body and air filter box outlet, and I cannot make the flanges go flush - not even close. Actually, yesterday I managed to get the carb out of the airbox and used a good hour to get it back there (what a f****ing ordeal). Any pointers?

[(F5)]

Undo the subframe,

Throw away those needles or forever be subservient to shitty running.
Your choice.

[Nocams]

Originally Posted by (F5)

Undo the subframe,

Throw away those needles or forever be subservient to shitty running.
Your choice.

I always use a heatgun to lightly soften the airbox boot to aid refitment of the airbox. Also what carb size,elevation and ambient temps have you got?