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mechanics, briggs is the choice hands down.One of the main differences is
briggs has one type of flywheel key,whereas tecumseh has three or four
depending on the horsepower.
The bigger briggs engines have two carbs they use,walbro and nikki.Nikki
being the more expensive, however walbro will usually interchange to the
manifold.Gas getting to manifold is different in briggs than in tecumseh,one
of the main jets for tecumseh is actually the nut that holds bowl on, you will
notice it has two tiny pin holes around the side of it and in the center of the
nut is another pin hole that the gas is actually sucked through,these tend to
stop up from season to season,briggs has a hole actually in the body
where the nut screws in and rarely stops up.
Briggs and tecumseh have bushings on each end of the crank,
whereas,kohler, kawasaki and honda have roller bearings,roller bearings
make for closer tolerances, therefore smoother running engines, however
their parts are higher as well as the overall engine for that matter.
Parts for briggs and tecumseh are less costly than for the others, especially
carb kits and parts,as far as longevity goes I WOULD HAVE to say that is
related to the care taken of the engine, oil change, air filter, spark plug
changes and general maintenance a person takes on his or her engine.
3 to 6 hp engines differences are mainly in carb design as far as failure rate,
briggs uses a different carb for these smaller engines, whereas tecumseh,
more or less uses the bowl style with the jet in the bowl nut as discussed
above.