Kawasaki FX820A-AS00-S Engine | 34.5 HP, 1-1/8" Vertical Shaft

Overview

Find a high-output replacement powerplant for your commercial zero-turn or riding mower with the Kawasaki FX820A-AS00-S vertical-shaft engine. This seller-listed new engine is advertised at 34.5 HP with a 1-1/8-inch diameter × 4-9/32-inch crankshaft, electric start, and multi-port digital fuel injection.

The FX820V EVO family is an air-cooled, 90° V-twin with pressurized lubrication, cast-iron cylinder liners, and a heavy-duty canister air filtration system. Kawasaki publishes 34.5 HP at 3,600 RPM and 822cc displacement for this series.

Confirm the complete engine specification before ordering. FX820A identifies the engine family; the AS00-S (or equivalent) specification identifies the configuration offered here. Shaft length, charging system output, and wiring can vary between specification codes.

Kawasaki FX820A-AS00-S Specifications

• Manufacturer: Kawasaki
• Advertised engine specification: FX820A-AS00-S (also known as FX820AAS00S / FX820A-(A)S00-S)
• Engine family: FX Series / FX820V EVO
• Published family power: 34.5 HP at 3,600 RPM
• Displacement: 822cc (50.2 cu. in.)
• Design: Air-cooled, 4-stroke, OHV 90° V-twin gasoline engine with EFI
• Crankshaft orientation: Vertical
• Advertised shaft diameter: 1-1/8 inch
• Advertised shaft length: 4-9/32 inches
• Starting system: Electric start
• Charging system: Typically 15–30 amp (confirm exact output with seller)
• Fuel system: Multi-port digital fuel injection with electric fuel pump
• Lubrication: Pressurized lubrication with spin-on oil filter
• Air filtration: Heavy-duty multi-stage dual-element canister filter
• Muffler: Not included
• Condition: New, as listed by the seller

Shaft dimensions, charging system amperage, and included components reflect the selected seller’s advertised configuration. Compare them with your original engine and confirm the complete code of the engine supplied.

Riding Mower and Zero-Turn Engine Fitment

This listing is organized around the FX820A-AS00-S specification. An FX820V-equipped mower is a starting point for comparison, not automatic confirmation that this exact specification will fit.

• Engine identification: Compare the model, full specification code, and serial number on your original engine label.
• Crankshaft: Confirm 1-1/8" diameter, usable length, keyway, and retaining-bolt thread. Measure from the same reference points used in the engine drawing.
• Mounting and clearance: Check mounting holes, engine height, and clearance around the air cleaner, exhaust, starter, and EFI components.
• PTO clutch and drive pulley: Confirm shaft engagement, pulley position, and belt alignment. A 1" clutch bore will not fit this shaft.
• Electrical system: Match charging requirements, connector arrangement, and mower wiring. EFI models have additional fuel-system and throttle-control connections.
• Controls and exhaust: Verify throttle cable travel, fuel routing, and muffler compatibility. Canister air filter clearance must also be confirmed.

This engine is commonly referenced for higher-end commercial zero-turns (including certain Bad Boy Rebel / Rebel X configurations). Always confirm the exact original specification with the seller or an authorized Kawasaki Engines dealer before ordering.

What’s Included?

One engine in the seller’s advertised FX820A-AS00-S configuration. The muffler is not included. Confirm whether a fuel pump, oil filter, and any harness or sensors are supplied, and which components must be transferred from your existing engine.

Buy Through the Selected eBay Seller

Use the Buy on eBay button to view the seller’s current price, stock, shipping options, and purchase terms. Payment, fulfillment, returns, and any warranty arrangements are handled through the seller’s offer. Price and availability may change.

Frequently Asked Questions

Does this replace every Kawasaki FX820V or FX820A engine?

No. FX820 engines can have different specification codes, shaft lengths, and charging systems. Compare the complete code and physical requirements before choosing the AS00-S offer.

Does this listing use a 1-inch or 1-1/8-inch shaft?

The selected seller advertises a 1-1/8-inch diameter × 4-9/32-inch shaft. It should not be treated as a direct replacement for a 1-inch shaft application.

Is this an EFI engine?

Yes. The FX820A EVO series uses multi-port digital fuel injection. Confirm the seller’s listing matches the electrical and fuel-system requirements of your mower.

Can I reuse my existing PTO clutch?

Only if its bore, mounting arrangement, and position match the 1-1/8" replacement shaft and your mower’s drive system.

Need help identifying your existing engine? Contact PTO Direct USA with your mower model, serial number, and clear photos of the engine identification label.

Compare other options in our replacement engine collection, or browse our electric PTO clutch catalog.

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