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Yamaha 25B | Haines Hunter HQ


If you're after no nonsense, lightweight, two stroke power, Yamaha's 25B ticks all the boxes. Built around a proven two cylinder CV platform, these engine have earned a stunning reputation for durability and reliability and can be seen powering vessels around every corner of the globe. Superior design and engineering allows these engines to run a 100:1 pre mix oil ratio for crisp response, less smoke and odor, and smooth operation. Yamaha's exclusive corrosion protection featuring self sacrificing annodses, Yamaha's YDC30 marine grade aluminium alloy and 5 stage painting process keeps the engine looking its best and operating in great condition long into its life.


Engine Type

2-Stroke, In-line 2

Bore x Stroke (mm)

72 x 61

Displacement (cc)


Recommended Maximum RPM


Fuel Management




Lubrication System


Alternator Output

Optional with rectifier

Gear Ratio

2.08 : 1

Starter System


Operation Method

Tiller handle

Trim and Tilt Method

Manual tilt

Standard Features

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