Why is it blowing white smlke - Craftsman 675 Torque 190cc 21" Briggs Stratton RearBag Push Lawn Mower (CA) ()

White smoke is usually coolant in the combustion chamber. Check for leaks, with a pressure tester.

Check coolant level.

Blowing white smoke indicate that your burning prestone in your cylinder. Probably a hed gasket tht is craked and leaks into your cylinder , if not than it's a craked head or block again leaking into a cylinder. have you car checked for a leakdown test of your cylinders.

I bet you'll find where your prestone is leaking.

you might check your valve seals if it does this moreso when its colder

water getting into cylinders causes white smoke maybe a crack in cylinder head any misfiring from engine

You may have a blown head gasket.

If it wont blow on "any" speed, rap on the blower, if it starts to blow, replace the blower motor. If not, check the fuse, (under hood fuse box) FUSE 2 40 Amps. The Pink/White wire at the blower should be 12V. If the pink/white wire is hot, and the Orange/Black wire is not, the motor is bad.

Blue --is Oil
White- is Coolant

Bad intake gasket or head basket

Replaced the carburetor had gas In oil. Changed oil, synthetic, 10/30 wt. Adjusted the valves. Started hard flywheel froze. Finally started then jackrabbit. Adjusted the carb throttle, was blowing blue black smoke now blowing white smoke through the exhaust. During one of restarts it didn't blow any color exhaust. Stumped. Riggs n stratton 18.5 riding mower. On fixed income need some close answers

Check the EGR and the fuel pressure regulator.These are very common culprits.