Running rich EC300

[swegass]

Hi,
Just bought a 07 EC300 and as I have little experience of this kind of engines (only old ones without reed and pipe) I have to get some help where to start out in this matter.

My feeling is that it's running rich, idle is a bit hard to set as it has a tendency to stay on high rpm and needs quite some time to settle down if it ever settles.

It sounds rich and rough when there is no load on the engine at lower rpm's, but loading it slightly makes it run "clean" (this is off the pipe).

After running on low to mid rpm's (off the pipe) it will stumble when accelerating just before getting into the powerband if I flip the throttle a couple of times it cleans out and hits the pipe in a good way with full power as I belive :-)

I need some hints where to start to look for this problem (well now if it is a problem or if I just ride it too soft lol) like carb, PV or reed, I have to add that it's running on a 40 gear (it was set up for street use when I bought it and will change to 48) in the rear but not sure at front maybe 14??

Please any suggestions will be welcome.

Lars