I think I have to assume the bike sat? I then have to assume along with Dan, that we need to establish a sit time, age of battery, is battery original, never charged, it's riding season, it wanted to fire over, it did one of those, 'for every sound, there is a suck and a blow?'
Didn't the compression push the piston down, he hears the for every action there is an opposite is the crankcase is what he heard suck?
So the battery is weak, the shaft is not broken to cause a reverse of compression was the bottom of the piston sucking crank throw. Just an internet guess between what little there is to go buy... A battery.
:flag: Like Dan said... "Buy American." Well, in a way he said it like that. So the question back is... Did we charge the battery any? Is the battery original kind of questions.