Kawasaki vs Briggs & Stratton (Vanguard) on a Zero-Turn

Several makers build one zero-turn and offer it with two engines. The Ferris ISX 2200 60 in is listed with a Kawasaki FX781V EVO at 30.5 hp or a Vanguard 810 EFI at 28 hp, on the same deck, transaxles and frame. Grasshopper's stand-on SO34 carries a Kawasaki 822 cc and the SO37 a Vanguard 993 cc. The engine is the only thing you are choosing, so it helps to know what the two names stand for. This page does not pick one. It explains what each maker builds, what the published figures mean, and what the catalogue shows across every ride-on mower with a 48 to 61 inch deck.

Two names on the Briggs side, and they are not the same grade

Briggs & Stratton sells mower engines under its own name and under Vanguard, its commercial brand. A Briggs & Stratton EXi or Professional Series V-twin is a residential engine. A Briggs & Stratton CXi, the Commercial Series, is the step up and is what Ferris fits to the IS700. Vanguard is the top tier: the 810 cc V-twin and the 993 cc Big Block, both offered with electronic fuel injection, and on machines built for it, an Oil Guard system that moves the oil change interval out to 500 hours.

So a Kawasaki-versus-Briggs choice can be a residential engine against a commercial one, or a commercial engine against a commercial one. Read the series name, not just the make.

Kawasaki's grades: FR, FS, FX

Kawasaki uses the second letter the same way. FR is the residential V-twin, FS the semi-commercial, FX the commercial grade with canister air filtration and a commercial duty rating. The numbers after the letters track displacement, so an FR691V, FS691V and FX691V are all 726 cc engines at three durability levels. The FR vs FS vs FX guide linked below goes through the differences.

Rated power is measured differently

Kawasaki certifies every FR, FS and FX figure to SAE J1995 at 3,600 rpm and labels it Critical Power. Briggs & Stratton publishes gross horsepower to SAE J1940 for most engines, and torque rather than horsepower on some residential models. The standards are close but not identical, so a 1 or 2 hp gap between a Kawasaki and a Briggs on the same mower is within the difference between the rating methods. Displacement, which both makers state the same way, is the fairer comparison: the ISX 2200's two engines are 822 cc and 810 cc.

Fuel system

Both makers sell carburetted and fuel-injected versions. In the catalogue, EFI appears far more often on Vanguard than on Briggs & Stratton's own badge, and on Kawasaki's FX line more than on FR or FS. EFI starts without a choke, adjusts for altitude and fuel and generally uses less fuel at part load; it also needs a battery in good condition and a dealer with the diagnostic tool when something fails. A carburettor is simpler to service in the field and more tolerant of a weak battery.

Service interval and warranty

Oil change intervals are where the brands differ most on paper. A conventional V-twin from either maker is on a 100 hour interval or thereabouts. Vanguard's Oil Guard, where the mower maker has built the reservoir in, is published at 500 hours. Kawasaki's FX engines use a spin-on filter on an interval of the same order. For a homeowner mowing 40 hours a year the difference is academic; for a crew it is a real cost.

Warranty terms are set by the engine maker, not the mower maker, and differ between residential and commercial use. Kawasaki's FX series and Vanguard engines carry commercial warranties; FR and Briggs residential series generally do not cover commercial use. Check the current statement from each maker before relying on a figure.

Parts and dealers

Both makers have national parts distribution. The practical difference is local: the dealer who sells you the mower services whichever engine it carries, so ask which one they stock filters, belts and ignition parts for. On the ISX 2200 the Kawasaki version is 47 kg lighter than the Vanguard version as published, which is the only other spec that moves.

What the catalogue shows

The table below groups every zero-turn and commercial ride-on mower MowerFacts holds with a 48 to 61 inch deck by engine make. Two things stand out. Kawasaki appears on more machines than every other make together, which is why dealer familiarity favours it. And Vanguard-engined mowers sit at a much higher median price than Briggs & Stratton-badged ones, because Vanguard is fitted to the heaviest commercial machines: the Scag Cheetah II, the Dixie Chopper XCaliber and the Ferris ISX 3300 all carry the 993 cc Big Block.

Ride-on mowers with 48 to 61 inch decks, by engine make

Zero-turn and commercial ride-on mowers MowerFacts holds with a 48–61 in deck and a published engine make. Power and displacement are each manufacturer's own rating; the median price is of models with a published list price.

The machines this page was written around

• Ferris ISX 2200 60 in, Kawasaki FX781V EVO
• Ferris ISX 2200 60 in, Vanguard 810 EFI
• Ferris IS700 60 in, Briggs & Stratton CXi
• Grasshopper SO34, Kawasaki
• Grasshopper SO37, Vanguard
• Scag Cheetah II, Vanguard Big Block

Related on MowerFacts

• Kawasaki FR vs FS vs FX: what the letters mean
• Zero-turn transaxles, EZT to ZT-5400
• Every mower with a Kawasaki engine
• Every mower with a Vanguard engine
• Every mower with a Briggs & Stratton engine
• Zero-turn mower comparison chart

FAQ

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Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.