Yamaha ME421ST (Hydra Drive) Marine
Yamaha Inboard Yamaha ME421ST (Hydra Drive) · YA-ME family — specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.
The Yamaha ME421ST is a marinized Toyota 1HD-series 4.2 L inline-6 diesel (1HDT lineage). Many internal service parts cross to Toyota Land Cruiser 1HD channels — but Yamaha used proprietary pistons/rings under high boost and some marinizing-specific parts, so verify fitment before swapping. source
Australian parts fiche year 2000; ~240 hp class (ME421STI forum rating)
A ✓ means at least one cheaper channel — aftermarket, the tractor/industrial base engine, or a standard component — exists for this engine in that category.
External links — we host none of these documents.
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- Category
- Marine
- Engine family
- YA-ME
- Year range (approx)
- from 2000
- Cylinders
- 6
- Rated output
- 240 hp (176.5 kW)
- Bore × stroke
- 94 × 100 mm
- Displacement
- 4164 cc
- Max rpm
- 3800
- Aspiration
- Turbocharged
Related YA-ME engines
Open the full interactive engine page → (specs, cross-references & parts).