Check tank venting,see if gas cap is properly venting the tank.
It could be there is a screen filter in the tank that might need cleaned its part of the petcock (shut off valve) in order to clean it you need to drain the fuel tank and remove it from the bottom of the tank use caution removing it so you can reuse the gasket and that you don't break it off they stick up into the tank a couple of inches (you might have to remove the tank from the bike to get it out) time to get dirty and have fun
SOURCE: 1970 sportster jumps out of 2nd gear
molre than likely the trans has to come out. The gogs and slots on the gears are worn . ( it's how the engage and transfer the power from gear to gear )
I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_5bac37c3cb991fdb
SOURCE: i have a 1979 harley sportster. and 2nd gear acts
replace 2nd gear,,,the "dogs" are worn and it is having trouble "locking: in second [knwn to be a weak gear]
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