Timing? Did you make sure you timed it correctly? One thing that happened to me, when I rebuilt mine was that even thou, I was getting spark through the plug, it was not a strong one. After a few weeks of scratching my head, I used starter fluid. And I got a hiccup. And know I was getting fuel to it. So double checked the spark. Put in a old spark plug that worked when I took it out. Fired right up.
Make sure you got good seals around the intake. That your not getting any extra air, after your carb.
Did you gap your springs?
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