Pleiades thank you so much!, u did mention that, i should have read that post more times..

It took me some time and yesterday i checked the operation of this decompression mechanism, actually i couldn't find any thing or probably i cant spot it,
i took a video, maybe u can see something i can't ..
dont really know what to look for, or where too look next..

*actually when i compere the pin position in the picture to the pin in my motor, looks like it is upside down?
the grooved side of the pin is on the upper side in the picture, and in my motor is down side ?