Excellent selection of tricks. I guess if I ever have trouble with the SUs, I might try some of them.

Actually, I have tried different viscosity oils in the dashpots, and I think I can add to Topi's synopsis of the effect. I believe using a more viscous oil will cause temporary enrichment of the mixture on acceleration, rather than making it leaner. The dashpot slows the progress of the piston as it opens, leaving a smaller opening for the air to flow through. Less air equals more fuel, given the same vacuum. At a constant engine speed, the dashpot oil will not affect the mixture.

One way to test this is to remove all oil from the dashpots, making the viscosity as thin as air. In this case, the mixture will be so lean on acceleration that the car will bog down, but when the engine reaches a constant speed, it will run fine. (I did this once by forgetting to top up the dashpots for a few weeks.) -Glenn.