Poor Running Under Load

[roundyuk]

Been a while since I was on here, over on the Polestar forum after changing from the V60...but my dad has just bought a 122S :-)

We're having some problems with running though, she starts and idles fine, even drives ok with very light throttle; but when under load she can really stumble and kangaroo!

Checked the choke was returning closed, all ok and then pulled the plugs - really wet and very very black; my assumption is she's running very rich? In fact you can tell she is as the black mess coming out the back is very wet! The plug gap was also huge, adjusted them.

We did check the timing and this was a bit too retarded, so tweaked that a little and things have improved from where they are, but she's still stumbling under load when you put your foot down.

It's got a cone filter and intake setup and the engine was recently rebuilt; points and cap look ok. I guess the next thing is to reset the carbs to base and go from there?