Statey - first of all, I would check that you have plugged EVERY plug in properly. Especially those behind the inlet manifold, they control water temp check etc. If they are unplugged it will run really rich thinking its freezing cold. They are all colour co-ordinated and people here will be able to point u in the right direction for most of them if you are confused. I once forgot to plug one in behind and below the inlet manifold (it is part of the sandwich plate between inlet manifold and head) and it ran like a bag of shit iirc.

Once you are sure EVERYTHING is plugged in right, then I would be surprised if both are 1600 cc's if they are needing fuelled that much different, suppose they might. Interpro, I guess, if you tell them in advance, will be more than happy to set the base fuelling.

You could always adjust it yourself, but it might be a bad idea. I would check ALL the plugs are put in the correct places first!

Cheers

RW