When I had my Climax car, I had a oil fowling problem, resulting in black, wet plugs. The oil flow along the copper lines was too high. It needed a wick in the line to inhibit oil flow. Used pipe cleaners to rectify. Once fixed, it was a lot better. It is a tricky motor to get just right. My current series 1 is a Standard Special with a zenith carb so I am not the best to help.
George Proudfoot is very knowledgeable but always busy.
Cheers,
