Push sward mower will start but sounds close to its choking? I have a old-fashioned briggs and stratton push mower, some bolts...

I have a old-fashioned briggs and stratton push mower, some bolts were loose and the kid subsequent door tighten them for me, and now it will start but its deeply low, there is a bit bit of white smoke, what type of problem do you think this might be, is it the carburator or perchance spark plug..could you explain to me what to do...thanks E
Cost of Repairing Roof?
Answers:    Lots of things can shift wrong... Bad (old) gas, clogged filters surrounded by the gas tank. Dirty, clogged nouns filter. Fouled spark plug. Choke stuck. Start with some of the unashamed. Gas, air filter and spark plug. I use a no foul plug. Best investment ever.
How do I fixup/cleanup/refurnish my walls contained by...
Little white smoke?
Did you conversion the oil?
Change spark plug?
Adjust carburetor next to set screws.
Go to Brigg and Stratton .com. consequently go to FAQ and support ask in that.