# FD851D-PS04S - ENGINE, 31HP KX 800 DFI - KAWASAKI

FD851D-PS04S - ENGINE, 31HP KX 800 DFI - KAWASAKI - ARGO PARTS

Replacement Kawasaki FD851D liquid-cooled engine  
  
Same as Argo 400-0021  
  
Model:  Kawasaki FD851D DFI  
Type: FD851D-PS04S  
31hp Liquid-Cooled  
1-1/8" Crankshaft  
  
**Having RPM or running issues with your Kawasaki FD851D engine in your Argo?  Call us as we can help remedy the issue.**  
  
**Tech Note:**  This engine is not a replacement for the Kohler Aegis EFI 31hp and will not fit in the old style chassis from 2004-2019 as the engine is too tall and the wire harness is completely different.  
  
  
**This engine is a special order and can take 2 weeks to 2 months to receive based on factory inventory of engines available to ship.**  
  
**Ships commercial freight.  
  
**Replaces:  FD851D-MS04

## Details

- **Price:** 3476.99 USD
- **Vendor:** KAWASAKI ENGINES
- **Tags:** Freight, Kawasaki Engine Parts, New Engine, OEM Parts

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3476.99 USD | In stock |

## Images

- 400-0021 - ENGINE, 31HP KX 800 - EFI - ARGO PARTS 
- Kawasaki Engines Genuine Parts & Accessories

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> Source: [Doc's Full Bore Outdoor](https://parts.docsfullboreoutdoor.com/products/fd851dps04s)
> Updated: 2026-05-20