Join Date: Sep 2011
Location: Caldwell, Idaho
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I would go through the carbs real good, make sure they arent all gummed up, and pay close attention to the choke / enrichening plungers. I would also check for vacuum leaks when running, if its sucking air (with no fuel) from somewhere else, you wont get much from the choke
When you are trying to start, are you holding the throttle open? If so, try without; the enrichment circuit doesn't work well at all when the throttle slides are lifted (the velocity of the air going across the enrichment circuit opening is way less with the throttle open, not allowing extra fuel to be picked up to enrich the air/fuel mix.) I agree with jrscars; cleaning the carbs and making sure the enrichment plungers are moving properly is also a good idea.
It does sound like carburation, but there are also some throttle safety switches in the throttle block; if the throttle cable tension isn't set to spec, it may not be allowing spark. The gap should be 0.010" to 0.030" from the throttle flipper to the throttle block. Also, the choke flipper should have 1/8" to 1/4" slack, if there's too much slack there, the plungers won't rise to allow extra fuel in.
Next time it's not starting, check for spark (use an inline tester if available.) That way, you can narrow down your problem to either fuel or electrons.