Hi Bruce,

I have a vantage 2 circa 1998. It become hard to control using the throttle control i.e. it only wanted to run flat out, idle or stop (no in between rev control). I suspected the carby, so I disassembled it and noticed that the large rubber diaphragm that the poppet valve is fastened to had partially flopped inside the chamber breaking the seal between the compartments. Also the grommet that holds the kill switch wire into the chamber is a bit distorted and maybe leaking air?

1) Do you think the problems could be related to the diaphragm seal? The diaphragm looks okay, and I have placed it back in its correct location and clipped on the cap that holds it tight.

2) Could an engine backfire cause the diaphragm to dislodge?

3) And should the distorted grommet for the kill switch make a good seal or is this distortion normal? It still seems to trigger the engine to cut out correctly.

Thanks in advance cheers2

James