Briggs and Stratton 650EXi, 675EXi and 675Is Lawnmower Engine Spares
They have a plastic fuel tank mounted on the left hand side of the engine (viewed from behind), a plastic air filter housing in front of the tank. They have Ready Start automatic choke for cold starting.
The exhaust is on the right side. Their model number will begin 103M or 104M.
The model-type-code can be found stamped into a plate just in front of the carburettor or on the right hand side stamped into the main engine block by the dipstick tube.
With this information, you can use our interactive parts diagrams to find the parts you need.