A quick pull on the choke will get the engine up to speed, but put load on the engine and it will very quickly die.
A question about the heat riser.....once the engine is warmed up I'd assume it's supposed to be in the fully open position, so shouldn't the engine run properly at that point even if the riser was missing? It would just take a little longer for the intake manifold to get warm. Or is the flap doing something to direct the heat flow even when it's in the fully open position? Is the riser only there to help things along until it's all nice and toasty warm? Then the spring slowly pulls it back out of the way and everything is supposed to work fine?
My carburetor is the single venturi variety with no accelerator pump.
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