Barnett Trials

Hi there I have a Montesa 304, needing a new carb. Its fitted with an Amal - any idea what model it should be, and what alternatives are there ? cheers John

Can anyone help ? No spark from a TR34 I've just bought. Looking at the electrics:- Blue and brown wires come from the bottom terminal of the coil. Blue goes into the harness, brown is split into two, but unconnected (has there been a kill swithch ??) Black wire comes off the top terminal on the coil - goes into harness Green wire comes out of harness, goes nowhere. Yellow wire comes out of harness and loops back in. Fitted a new spark Plug cap (the original looked well used). Before I start on anything expensive - any ideas ? cheers John