ec125 -01 power valve issue?

[Nicolas89]

But then it would rev but not accelerate!?

[Elvis74]

correct, but my intention is, when it works in the 2. or 3. gear, there must be something else wrong.

[Nicolas89]

I understand. But it runs bad also in neutral.
So what is the leanest and richest jet i need to try with

[Elvis74]

like I wrote already,

I use 185 - 195 depends on the weather.
Are you sure that everything else is OK.
Have you checked the carb, the reeds, and so on?!?!?
Maybe your ignition is wrong positioned.

[Nicolas89]

The carb seems ok. What can be wrong? The reeds are tight. How to check the ignition?

[Elvis74]

I have to take a picture to explain, will do this later!

[Jakobi]

Originally Posted by Nicolas89

I understand. But it runs bad also in neutral.
So what is the leanest and richest jet i need to try with

Work with a methodical approach and you'll start getting somewhere.

No idea on engine hours, no idea on engine conditions. Ideally you'd pull the cylinder, check the tolerances, check the compression ratio and squish, put some new rings in it, check the PV governor, and check the reeds. Then move onto carb side of things.

Check the float height first. Without you are wasting your time.
Then make single changes and evaluate what effect it has. I personally start with the needle clip as it gives the biggest/most noticable change. Then come back and fine tune the pilot, air screw and needle diameter (if req), and finish off on the main.

Its probably not what you want to hear, but when you have a load of unknowns you're really going to have to start checking things off the list before you start seeing progress.

[Nicolas89]

The ONLY unknown fact that you mention is the hours... i cant imagine an engine run bad only in mid range due to low compression?

[Nicolas89]

Info about the float height would be great.
Thx to all involved so far

[Elvis74]

When the piston is in top dead center, the ignition must be located like this:



Check the gas cap too, maybe the tank vent is blocked and due to this the fuel is only able to go slowly down into the carb.

The squish should be around 1,4mm when using all original parts.