carburettor for two stroke engine-cross section view?

Answer 1

Try here. I don't know what bike you need it for but they have Honda, Suzuki, Kawasaki, Yamaha parts diagrams.
http://www.mrcycles.com/default.asp

Answer 2

Always give year, make, engine size and model # when asking questions. We need that info to find what you're looking for.
BikeBandit has most bikes. For an older bike, you'll need a different parts book.
http://www.bikebandit.com/partsbandit/OEM-Parts.asp

Answer 3

be more specific on what you need