Choosing between outboard motors for a tender, a small fishing boat or a training craft comes down to three measurable decisions: how much power the hull can use, how you want to start and control the outboard engine, and how deep the transom sits below the clamp bracket. This guide walks those three decisions against one concrete platform — the 2-stroke 6 HP seawater model — so you can arrive at a quote with the shaft length and fuel setup already settled.
Each decision narrows the choice for the next one. Work down the list and the specification answers itself before you ever reach a quotation.
Decide whether a 103 cc, 4.5 kW (6 HP) single-cylinder 2-stroke suits the hull, the load and the way the boat is actually used.
02Tiller handle, manual start and F-N-R shifting define who operates the boat and how much wiring the installation needs.
03Measure the transom once and pick between the 444 mm short shaft and the 571 mm long shaft — and the 1 kg of weight that separates them.
Supply is quote-based rather than an online checkout: send the boat, transom and fuel-tank details and DIMO Marine returns the matching model configuration. OEM branding and specification adjustments are available through the same request.
The platform delivers 4.5 kW (6 HP) from a single cylinder displacing 103 cc, with a bore and stroke of 54.0 × 45.0 mm and a maximum range of 4500–5500 r/min. That is a compact, light-duty power band built for displacement hulls and short coastal runs, not for planing a heavy boat.
Because it is a 2-stroke, the engine relies on a 50:1 fuel-to-oil mix rather than a separate oil reservoir. Idling sits at 1200 ± 50 r/min, which matters if you manoeuvre in tight marinas or hold the boat steady while fishing.
Buyer decision: if your hull already carries a 6 HP-rated transom and the daily load is a couple of people plus gear, this is the size to price. If the boat is heavier or expected to plane with a full load, move up before requesting a quote — the engine will not grow with the boat.
This model is tiller-steered with a manual start and a mechanical F-N-R gear shift, fired by a direct CDI ignition. In practice that means no remote control box, no starter cabling and no battery dependency at the helm — a simpler installation that suits open boats and single-operator use.
Buyer decision: if your installation plan assumes a remote throttle, electric start or a helm console, this tiller configuration is the wrong match. Confirm the control layout before you quote, because the specification on this page describes a tiller-handle, manual-start machine.
Measure the transom from the top edge down to the bottom of the hull, then match it to the transom height of the model. Everything else about the two versions is identical.
Buyer decision: a shaft that is too short lets the propeller ventilate in chop; too long adds drag and risks grounding. The 1 kg difference between the two versions (21.5 kg vs 22.5 kg) rarely decides the choice — the transom measurement does.
The specification table lists this platform under the model name T6; the product model numbers are DMST6S for the short shaft and DMST6L for the long shaft.
| Specification | Value |
|---|---|
| Model | T6 (product models DMST6S / DMST6L) |
| Applicable waters | Seawater |
| Type | 2-stroke, 1-cylinder |
| Max. output | 4.5 kW (6 HP) |
| Displacement | 103 cc |
| Bore × stroke | 54.0 × 45.0 mm |
| Transom height | S: 444 mm · L: 571 mm |
| Dry weight | S: 21.5 kg · L: 22.5 kg |
| Steering system | Tiller handle |
| Starting system | Manual start |
| Gear shift | F-N-R |
| Ignition | CDI |
| Trim & tilt | Manual |
| Gear ratio | 2.08 |
| Max. RPM range | 4500–5500 r/min |
| Idling RPM range | 1200 ± 50 r/min |
| Fuel tank capacity | Built-in 2.8 L / external 12 L |
| Mixing ratio | 50:1 |
| Gear oil capacity | 0.1 L |
| Propeller | 7 1/2 × 7-BL in. |
Quote-based supply: configuration, documentation and OEM requests are confirmed in writing rather than through an online cart.
Four common situations, each mapped to the concrete specification that decides the order.
Specify DMST6S — 444 mm transom height, 21.5 kg dry weight. The lighter unit keeps the stern of a small tender high, and the manual start removes battery weight entirely.
Specify DMST6L — 571 mm transom height, 22.5 kg dry weight. Long runs and trolling benefit from the F-N-R shift and the 1200 ± 50 r/min idle.
Choose the tiller-handle version in either shaft length: manual start, F-N-R and manual trim and tilt give trainees a direct, mechanical feel with nothing to programme.
Order the seawater-applicable build with corrosion-resistant materials. Fuel is a built-in 2.8 L tank with an optional external 12 L expansion for longer days, mixed at 50:1.
Four steps from a measured transom to a confirmed order, with OEM and specification customisation handled inside the same conversation.
Hull type, transom height, typical load and whether the boat is used in saltwater or mixed conditions.
Short shaft DMST6S or long shaft DMST6L, plus built-in 2.8 L or external 12 L fuel setup.
Written pricing for the configuration and quantity you need, including any branding or technical adjustments.
Order confirmation together with the download documentation for the model you have selected.
Tell us the transom height and shaft length you measured. We will confirm the model and return a quotation for single units or bulk orders.
Keep adjacent product options together for a faster catalog comparison.
review the product details, images, and specifications presented on the official product page.
use the application and use-case information published on the official product page.
confirm the specifications and options listed for the exact product variant before placing an order.
check the official product page or ask the supplier about options shown for the selected product.
use the official contact or inquiry path provided on the site.
include the product page, intended use, required quantity, and any specifications you need the supplier to review.