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Hi Eric, one of the best things you can do to a scott is fit a monobloc carb, the beauty of this type of carburettor compared to a concentric is that it can be tilted to the scott downdraught whereas the concentric has a limited angle and needs a curved manifold, I ran my birmingham on the following settings, 1&3 sixteenths bore 389 monobloc, D needle 105 needle jet,3slide, 340main jet, this might not suit your engine as I had other tuning mods, I also believe in not running a two stroke too weak especially a Scott which suffers from poor piston lubrication, good luck. Alan Noakes.