Installed a clutch now won’t start

My son put a Henson Clutch in his Honda 300 ex today put fresh oil back in put it all back together .First time around started perfect no problem we shut it off and than nothing you can hear it clicking but nothing happens.. It won’t start when it’s in Neutral either? If you rock back and fourth sometimes it would start but now nothing after a couple times of it being started. We have racked our brains all day trying to figure this out? Someone said something about the Rod that was taken out but not sure?Checked battery it’s good also the clutch is very lose barely any tension?