ec125 -01 power valve issue?

[Nicolas89]

I have now ran it with the pipe mounted.. the pv moves back n forth like brrrrrrr when holding the throttle steady 1/4 or half open.. so does the pv make the rpm "rattle" or does the rpm make the pv "rattle"?? (Im not sure what word to use when the rpm goes up and down very fast)

[Elvis74]

The max rpm on the 125 is about 10000rpm
Open the clutch housing and check the mechanic of the PV and if the steel balls are in correct position. Check also if the PV slides in the zylinder are moving smooth.

I run on mine 125 the following

Pilot jet 50-50
Main jet 185-195
Needle NOZI
Position 2
Slide no 7
Air screw 2,5 open

My PV opens at about 5000-6000 rpm and it just snaps open, no slow moving.

[Nicolas89]

Okej. Mine alsosnaps open if i twist the throttle quick. I,ve checked every part of the pv system. Ive also tried that needle... so what can be my problem? I thoughtmy jetting was too rich but now i dont know..

[Nicolas89]

Position 2? Is that from top or bottom? One step above middle

[Nicolas89]

So whats the leanest and richest jetting i will need to figure this out? So i dont buy anything i wont need... whats your opinion aboutthe n3eg needle i use in my ec300 is there a reason to use that in my 125

[Elvis74]

needle pos. 2 from the top!
which pipe and silencerare you running?

usually as smaller the motor, as richer the jetting!

[Nicolas89]

Original exp champer and a fmf silencer

[Elvis74]

OK, this should work.
Dumb question, is you air filter clean and poisitioned correctly?
Do you know how many hours you have on the piston and cylinder?

[Nicolas89]

Yes its brand new. If i go away in 1st gear and hit the gas it takes lightyears to rev oout if i chsnge to 2nd or 3rd it seems to run better.

So I wont need leaner than 180 or 45?

No idea about the hours.. but starts very easily

[Elvis74]

have you checked the clutch? Maybe it's worn out and slips?