The FX1000V, the FS730V-EFI and the FR541V are three good lawn mower engines by Kawasaki. All three are Critical Power engines. Kawasaki offers the engines with a three-year warranty.
Critical Power engines adhere to the quality criteria set out by the Society of Automotive Engineers International. To qualify, engines must deliver the advertised net power and torque ratings. Kawasaki promises at least 98 percent accuracy in the advertised performance values.
With a displacement capacity of 999 cubic inches, the two-cylinder FX1000V produces up to 35 horsepower at 3,600 rpm. With the cylinders 3.5 inches in bore and the pistons 3.15 inches in stroke, the engine compresses air at a ratio of 8.4:1. The FX1000V can produce up to 56 pounds-feet of torque and features a pressurized lubrication system, electronic spark ignition and automatic compression release.
With a slightly smaller displacement capacity at 726 cubic inches, the FS730V-EFI produces up to 25.5 horsepower at 3,600 rpm. Also featuring a pressurized lubrication system, the engine is capable of producing up to 40 pounds-feet of torque at 2,400 rpm. It has a compression ratio of 8.2:1.
The smallest of the three, the FR541V produces 15 horsepower at 3,600 rpm and 31.7 pounds-feet of torque at 2,000 rpm. The engine displaces 603 cubic inches of air at a compression ratio of 8.1:1 and holds up to 1.7 liters of oil. The engine features cast-iron cylinder liners, a rotating grass screen and an internally vented carburetor.