3
REVIEW
Part 2 -Four-strokes from 25-30hp
In the second of his bimonthly guides to choosing the right low-pollution outboard for your boat, Andrew Norton compares four-strokes from 25-30hpTwin-cylinder 25hp four-stroke
Mariner/Mercury F25Yamaha F25AYamaha FT25BThree-cylinder 25hp four-strokes
Honda BF25Suzuki DF25Tohatsu MFS 25A30hp four-strokes
Honda BF30Mariner/Mercury F30 carburetted and EFI four-strokesSuzuki DF30Tohatsu MFS 30AYamaha F30AConclusionOnly the first service hours are different, but all engines have canister-type oil filters.
| FAST FACTS - twin-cylinder 25hp four-strokes | |||
| Engine: | Mariner/Mercury 25 | Yamaha 25A | Yamaha 25B |
| Engine type: | All engines crossflow twin-cylinder | ||
| Valve actuation: | SOHC | SOHC | SOHC |
| Valves: | 4 | 4 | 4 |
| Drive: | Belt | Belt | Belt |
| Prop hp @ rpm: | 25.1/5750 | 24.8/5500 | 24.8/5500 |
| WOT rev range: | 5500-6000 | 5000-6000 | 5000-6000 |
| Piston displacement: | 498cc | 498cc | 498cc |
| Bore x stroke: | 65 x 75mm | 65 x 75mm | 65 x 75mm |
| Ignition system: | All engines CD with electronic timing advance | ||
| Charging circuit | |||
| Manual start: | 76W 6amp | 15amp | 15amp |
| Electric start: | 189W regulated | 15amp regulated | 15amp regulated |
| Fuel delivery: | All engines single carburettor/ULP 91 RON | ||
| Fuel capacity (lt): | 25 | 24 | 24 |
| Oil (SAE): | 10W30 | 10W40 | 10W40 |
| Capacity (lt): | 1.7 | 1.7 | 1.7 |
| Gear ratio: | 2.42:1 | 2.08:1 | 2.42:1 |
| Transom height (in): | 15 | 15 | - |
| Weight (kg) | |||
| Shortshaft: | 80 | 62 | - |
| Longshaft: | 88* | 71* | 82.5* |
| Priced from: | $6029 | $5280 | $6385.50 |
| * With electric start and power trim and tilt | |||
| FAST FACTS - three-cylinder 25hp four-strokes | |||
| Engine | Honda 25 | Suzuki 25 | Tohatsu MFS 25A |
| Engine type: | All engines crossflow three-cylinder | ||
| Valve actuation: | SOHC | SOHC | SOHC |
| Valves: | 6 | 9 | 6 |
| Drive: | Belt | Chain | Belt |
| Prop hp @ rpm: | 24.7/5500 | 24.7/5500 | 24.7/5500 |
| WOT rev range: | 5500-6000 | 5000-6000 | 5000-6000 |
| Piston displacement: | 552cc | 597cc | 492cc |
| Bore x stroke (mm): | 61 x 63 | 65 x 60 | 59 x 60 |
| Ignition system: | All engines CD with electronic timing advance | ||
| Charging circuit | |||
| Manual start: | 4amp regulated | 15amp | 14V 210W |
| Electric start: | 12amp regulated | 15amp regulated | 14V 210W regulated |
| Fuel delivery: | All engines single carburettor/ULP 91 RON | ||
| Fuel capacity (lt): | 25 | 25 | 25 |
| Oil (SAE): | 10W30 | 10W40 | 15W40 |
| Capacity (lt): | 2.1 | n/a | 1.8 |
| Gear ratio: | 2.08:1 | 2.09:1 | 1.92:1 |
| Transom height (in): | 15 | 15 | 15 |
| Weight (kg) | 72.5 | Est 88 | 68.5 |
| Longshaft: | 74.5 | Est 90 | 70.5 |
| Electric start: | 75.5 | - | 71.5 |
| Power t/t: | 78.5 | - | 76.5 |
| Priced from: | $5465 | $5395 | $5315 |
| FAST FACTS: three-cylinder 30hp four-strokes | |||||
| Engine | Honda 30 | M/M30 | Suzuki 30 | Tohatsu 30 | Yamaha 30 |
| Engine type: | All engines crossflow three-cylinder | ||||
| Valve actuation: | SOHC | SOHC | SOHC | SOHC | SOHC |
| Valves: | 6 | 6 | 9 | 6 | 6 |
| Drive: | Belt | Belt | Chain | Belt | Belt |
| Prop hp @ rpm: | 29.6/6000 | 30.1/5750 | 29.6/5500 | 29.6/5750 | 29.6/5500 |
| WOT rev range: | 5000-6000 | 5500-6000 | 5000-6000 | 5250-6250 | 5000-6000 |
| Piston Displacement: | 552cc | 747cc | 597cc | 492cc | 747cc |
| Bore x stroke (mm): | 61 x 63 | 65 x 75 | 65 x 60 | 59 x 60 | 65 x 75 |
| Ignition system: | CD with electronic timing advance | ||||
| Charging circuit: | |||||
| Manual start: | 4amp reg | 6amp | 15amp reg | 15amp | 12/15amp |
| Electric start: | 12amp | 15amp | 15amp reg | 15amp | 12/15amp |
| Fuel delivery: | All engines three carburettors/ULP 91 RON | ||||
| Fuel capacity (lt): | 25 | 25 | 25 | 25 | 24 |
| Oil type (SAE): | 10W30 | 10W30 | 10W40 | 15W40 | 10W40 |
| Capacity (lt): | n/a | 2.0 | 3.0 | 1.8 | 2.0 |
| Gear ratio: | 2.08:1 | 2:1 | 2.09:1 | 1.92:1 | 2.00:1 |
| Transom height (in): | 20 | 20 | 20 | 20 | 20 |
| Weight (kg): | 78.5* | 96* | 96* | 76.5* | 91* |
| Priced from: | $5910 | $8126 | $6280 | $5386 | $6906.63 |
| *All weights include electric starting and power trim and tilt | |||||
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Written byAndrew Norton
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Please see our Editorial Guidelines & Code of Ethics (including for more information about sponsored content and paid events). The information published on this website is of a general nature only and doesn’t consider your particular circumstances or needs.
Please see our Editorial Guidelines & Code of Ethics (including for more information about sponsored content and paid events). The information published on this website is of a general nature only and doesn’t consider your particular circumstances or needs.
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