the coke on an SU really isn't a choke as such, pulling the choke lever just drops the jet further down to a richer point of the needle.

and the SUs have a sort of artificial accelerator pump that is part of the design.
don't remember how it works but i read it in the bible the other night.

so that rules that out.

maybe big willy's engine is running lean? and pulling the choke just put it back to stoich ?

maybe..........

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Cheers Steve.


1973 south african mk3, 1275 +30 (1300), RE13 cam, hif44, mildy worked head with s sized valves, pulsar dizzy, 1.5:1 minispares forged rockers.