Nitro Engine 4-Stroke DIY Kit 2 Cylinder that Runs Full Assembly Kit With Instructions

SEMTO ENGINE ST-NF2 – DIY Buildable Nitro 4-Stroke 2-Cylinder Engine Kit | OTTO MOTOR FS-L200AC

This high-precision, entry-level nitro engine kit is a fully functional 2-cylinder 4-stroke internal combustion engine that you assemble yourself. Designed in collaboration with Toyan, SEMTO, and OTTO MOTOR, this model is perfect for hobbyists, students, and engineers looking to explore real-world mechanics in an affordable and hands-on way.

Affordable Precision Engineering
Toyan is known for its finely machined scale engines—but this time, they’ve worked with SEMTO and OTTO MOTOR to create a more accessible version for students and enthusiasts on a budget. The ST-NF2 (previously branded as FS-L200AC) maintains full 4-stroke functionality in a simplified and compact design—at a fraction of the usual cost.

Realistic, Functional, and Compact

High simulation design with detailed red accents and realistic proportions

Made from CNC-machined aluminum with oxidized finishing for strength and a refined look

Compact and lightweight with a precise, minimalist build

Dual synchronous belt pulleys reduce gear slippage during high-speed operation

High-torque brushed DC starter motor allows smooth electrical starting with no ESC required

Signal carburetor allows sensitive throttle response and easy tuning

Functional rocker arm and valve timing system for real-time mechanical accuracy

What’s Included

SEMTO ST-NF2 engine kit (unassembled)

480 brushed DC starting motor (pre-installed)

Full set of parts and components

User-friendly assembly instructions (beginner-friendly)

Note on Power and Ignition

Uses two ignition modules (recommended for smoother startup)

Runs on a standard 2S battery (not included)

No ESC needed—connect directly to the battery

If you already own an ESC and ignition modules, you can reuse them

USB hot plate and other accessories sold separately

Updated Branding
Orders placed after December 12, 2022, will ship with the SEMTO ENGINE ST-NF2 logo. The engine itself is identical to the previous FS-L200AC version—only the branding has changed. If you prefer the original logo, contact customer service before placing an order.

Technical Specs

Engine Type: 2-cylinder, 4-stroke, nitro-powered

Drive System: Dual synchronous belt

Starting: Electric start (no ESC required)

Materials: CNC aluminum, steel, plastic

Skill Level: Intermediate to advanced

Uses: RC car conversions, desk engine models, mechanical learning

Ideal For

Engineering students

RC hobbyists

DIY model builders

STEM education and demonstrations

Gift for gearheads or mechanical enthusiasts

This is a functional display model that gives you hands-on access to the principles of internal combustion. With clear instructions and entry-level pricing, it brings the magic of real engine mechanics within reach of every enthusiast.