Most Tridents were originally fitted with lightweight two-stroke Vire or Dolphin engines, most of which have now been replaced with small diesels.
- The 9hp Yanmar GM10 is the most common replacement diesel
- Yanmar 1GM10
- The 14hp Beta diesel just fits under the cockpit
- Farryman 10hp diesel in a Trident24
- Vire 6 two-stroke
- The Vire 7 replaced the Vire 6hp
- 12hp RCA Dolphin was original equipment on some Tridents
- Trident with 8hp Stuart Turner two-stroke petroil engine
- Lister diesel fitted to Trident 24
- Another Trident with a 9hp Yanmar
- Volvo Penta MD5 petroil engine fitted to Trident
- Bukh10 diesel in Trident
- Trident engine beds ready for new power unit
- Outboard well in Trident cockpit
- Outboard well in rear of Trident cockpit
- Outboard on Trident stern bracket
- Trident with outboard on stern bracket