chownsy wrote:I measured the OD of the NC24 carbs they are 38mm

You measure the ID..

There VDE32's on the NC24 (Hence the 32mm)

and VDA30's on the NC21.

I can't remember if the actual overall size is the same and there just bored out more but the rubbers will be different (there different part numbers for a start...)

Im pretty sure the rubbers i have fitted are NC24 rubbers.

Neosophist wrote:Ah.. brainwave.

you mean Flux capacitor moment

Stick with it Chownsy mine passed its Mot today, went for a blast, before the rain its well worth agg and my temp gauge works too

I will stick with it, just got to get it running nicely before summer ends and winter riding begins