Answer to all should be yes. If not, investigate In what condition is the carb?
You mention possible low vacuum. This can certainly make for hard starting. A few tablespoons of oil in each cylinder through the spark plug hole will help dry rings seal enough to pull a good vacuum. This is not uncommon on a brand-new engine that has not been started and has a poor ring seal. Valve timing can throw off engine vacuum – check by the procedure I mentioned earlier for checking cam timing My guess is that, since you did have it running for a half minute, that your valve settings are probably o.k.. You likely have a fuel delivery or carb setting problem. Good, full choke should pull up fuel. Make sure the carb bowl is full. If it’s an original Stromberg, you can flood the bowl manually to make sure it’s full by lifting up on the carb needle. Then try a bit of oil in the cylinders, cranking over a bit afterward to distribute the oil around the top ring. Make sure the choke closes fully and try again. If you get no fuel dumping out the bottom of the carb after cranking, you’
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- Answer to all should be yes. If not, investigate In what condition is the carb?
