Carburation
peterg,
Assuming your engine is a standard AB2 it should be fitted with three 32mm Solex downdraft carbs , not three downdraft SU's .
Those SU's are probably originally fitted to a 400 with a 85A engine .
They could be made to run correctly on your AB2 but would limit the revs much above 4500rpm. They might need re jetting to suit the AB2 and would need a balance tube fitted between each to get them to idle smoothly.
If you decide to retain them you should have the exhaust mixture check by a expert or you might burn a hole in a piston if it runs too lean.
I'd recommend removing them and fitting either three rebuilt original 32mm Solex or three new 34ICH Weber carbs .
The erratic idle is probably due to the carbs being out of balance and no balance tube cast into the head.
Please post a photo of the engine on the Forum so I can see what it looks like .
Regards
Geoff
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