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You cannot start an RF900 with the intake and exhaust cams reversed. You can:
Send your wife to the gas station to get more gas
Send your wife back to the store for carburator cleaner
Swap out dead battery with battery from running motorcycle
Dump raw fuel down the intake manifolds
Replace spark plugs
Among other things, but the the best bet is to install the cams correctly and it should start right up. Don't ask me how I know.