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@bq
Carbs are a 3D jigsaw puzzle.
you can do it in your kitchen.
You need some compressed air in a can (buy this from Maplins) and some petrol or other cleaning agent.
then just strip down the carb, clean everything, blow the air through the jets and check the floats all work.
Here's a guide I prepared earlier. It's for a DellOrto SHBC 19/19 but most fixed-jet carbs are similar
http://website.lineone.net/~smallframes/carb.htm