Flash Pre-Sales. Save 50$ OFF, Only $349.99. Code:E50
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Never built a running engine before? The ST-FL2 is made for that first step. It has a simple setup, push-button start, and a full build video to follow, all in the layout of a real car engine.
Hear it start up
You'll need the Starter Kit to fire up your ST-FL2. Order both together and the first 10 customers save the most.
Missed the first 10? With codes E50 and M2026, you still save $61 on the bundle.
A single carburetor feeds both cylinders, so you set one mixture and learn how the engine responds.
Electric start plus the 3-in-1 starter/ignition module: connect the battery, press the button.
The built-in water pump circulates coolant automatically. No extra pump to set up.
The Starter Kit brings the ignition, glow plugs, fuel and cooling parts together, so you don't have to hunt for compatible pieces.
You're getting the KIT version, so you build the engine yourself. The parts that make it run come in the Starter Kit. A quick check now means you'll have everything ready the day your engine is finished.
Not sure if you can do it? Watch the whole build first. You'll follow the same steps with your own kit.
| Brand / Model | SEMTO ENGINE ST-FL2 |
|---|---|
| Version | KIT (assembly required) |
| Engine type | Nitro internal combustion, four-stroke |
| Cylinders | Inline twin |
| Displacement | 8.6cc (2 × 4.3cc) |
| Bore × stroke | 18.00 mm × 17.00 mm |
| Valve train | Single overhead camshaft (SOHC) |
| Power | 1.2 HP |
| RPM range | 3,000–20,000 rpm |
| Carburetor | Single |
| Cooling | Water cooling, built-in centrifugal water pump |
| Lubrication | Mixed / oil-mist lubrication |
| Starting | Electric start (480 brushed motor) |
| Glow plugs | F-type ×2 (included in Starter Kit) |
| Fuel | 25% nitro fuel |
| Material | CNC-machined aluminum, anodized |
| Engine size | 11.31 × 9.15 × 10.34 cm |
| Engine weight | 900 g |
| Package size / weight | 14.5 × 11 × 11.2 cm / 1,400 g |
| Recommended age | 16+ |
Engine: enter code E50 at checkout and you pay $349.99 instead of $399.99. The code works on the engine only.
Starter Kit: enter code M2026 at checkout and you pay $98.99 instead of $109.99.
First 10 orders: once your order is delivered, we refund $20 for the engine, plus half of what you paid for the Starter Kit (about $49.50), to your original payment method.
Example: buy both and you pay $448.98 at checkout. If you're one of the first 10, you get $69.50 back, so the whole setup costs you $379.48.
No. This is a KIT version that you assemble, and the ignition, fuel and cooling parts are sold separately. The ST-FL2 Starter Kit covers those parts. You will also need an 11.1V 3S LiPo battery with a T-plug and 25% nitro fuel.
Yes. The ST-FL2 is one of our recommended first engines. It has a single carburetor to tune, push-button electric start, built-in water cooling, and a full assembly video to follow, so you can focus on learning how a four-stroke works rather than fighting the setup. Take your time with the manual during assembly and the first runs. See more starter options in our beginner engine collection.
It is designed with RC use in mind and leaves room for a clutch and transmission, which suits 1/8-scale builds. The clutch, transmission and mounts are not included, and fitting depends on your chassis.
A printed manual is in the box. You can also check our Download Manual page.