RETROL & OKMO N01 1/5 Scale Hit and Miss Vertical Gas Stationary Engine Model RTR

Retail Price $560.00 Launching June 18, 2026 // Limited-Time Launch Offer The earlier you order, the more you save. Retail $560.00 · Three phases · Best deal is now 🔥 Early Bird — Phase 1 Jun 18 – Jun 24, 2026 · 7 Days Only $560.00 $460 ✦ Save $130 Total 🎁 + $30 Store Gift Card included ✓$100 off retail price ✓$30 gift card with every order ✓Ships Sep 15, 2026 ✓All 3 colorways available Best Value · Order Now → Phase 2 — Pre-Order Jun 24 – Sep 15, 2026 $560.00 $460 Save $100 🎁 Gift card no longer included ✓$100 off retail price ✗No gift card ✓Ships Sep 15, 2026 ✓All 3 colorways available Pre-Order Window Phase 3 — In Stock Sep 15, 2026 onward $560.00 $476 Save $84 🎁 Gift card no longer included ✓15% off retail price ✗No gift card ✓Ships immediately ⚠Stock & colorways not guaranteed Standard Price ⚠ $30 gift card exclusive to Phase 1 · Jun 18–24 only · 7 days // Limited-Time Launch Offer Pre-order now. Save $100 before stock arrives. Retail $560.00 · Early bird offer has closed · Pre-order window open Phase 1 — Closed Jun 18 – Jun 24, 2026 $560.00 $460 Saved $130 — Closed 🎁 Gift card — offer ended ✗Early bird window closed Offer Ended 🟡 Now — Phase 2 Jun 24 – Sep 15, 2026 $560.00 $460 ✦ Save $100 🎁 Gift card no longer available ✓$100 off retail price ✓Ships Sep 15, 2026 ✓All 3 colorways available Pre-Order Now → Phase 3 — Coming Sep 15, 2026 onward $560.00 $476 Save $84 only 🎁 No gift card ✓15% off retail ⚠Stock & colorways not guaranteed Future Price ⚠ Pre-order price closes Sep 15 · After that, price rises to $476 // Now In Stock In stock and shipping now. Retail $560.00 · 15% off · Ships immediately Phase 1 — Closed Jun 18–24, 2026 $460 Saved $130 — Closed ✗Early bird + gift card — ended Offer Ended Phase 2 — Closed Jun 24 – Sep 15, 2026 $460 Saved $100 — Closed ✗Pre-order window — ended Offer Ended ✅ Now — Phase 3 Sep 15, 2026 onward $560.00 $476 ✦ Save $84 · 15% Off ✓15% off retail price ✓Ships immediately ✓Ready to run out of the box In Stock · Shop Now → Early bird and pre-order offers have closed · Current price $476 Sand-Cast Brass CNC Machined Steel Mechanical Trip Ignition Hardwood Display Base No Electronics 1,500 g · 3.3 lbs // About This Engine A Century-Old Cadence, Back on Your Desk Between 1895 and 1930, the hit-and-miss stationary engine was the backbone of rural America. Before electric motors reached the countryside, before tractors replaced draft animals, this single-cylinder machine did the work — powering cement mixers on construction sites, water pumps on homesteads, grain mills, sawmills, and feed grinders from coast to coast. Farmers depended on it. Contractors relied on it. It was everywhere. What set it apart from every engine before or since was its governor. A centrifugal flyweight system that let the engine fire only when it needed to, and coast on pure flywheel inertia the rest of the time. That gave it its sound — that unmistakable clack — clack — clack that anyone who grew up around one never forgets. Millions were built. Many are still running today, more than a century later. The RETROL & OKMO N01 faithfully recreates that machine at 1/5 scale. No plastic in the structural core. No electronics hiding the mechanism. Just sand-cast brass, precision-machined steel, a mechanical trip igniter, and dual heavy flywheels doing exactly what they did in 1900 — holding momentum through the miss, delivering power on the hit. Every phase of the four-stroke cycle unfolds in full view. The open-crank architecture conceals nothing: piston, connecting rod, ignition points, glass drip oiler, steam hopper — all exposed, all working. // How It Works The Hit & Miss Cycle HIT Engine drops below set speed Flyweights retract inward Exhaust valve closes Ignition points trip Power stroke fires Speed restored MISS Engine reaches set speed Flyweights extend outward Exhaust valve locks open No compression · No ignition Engine coasts on flywheel inertia "clack — clack — clack" The governor fires only when needed ⇄ Inertia carries the rest // See It Run Watch the Hit & Miss in Action The centrifugal governor at work — flyweights extend on the miss, retract on the hit. No tricks. This is exactly what it sounds like on your desk. // Specifications Technical Specifications // RETROL & OKMO N01 — Full Technical Data Engine TypeHit-and-Miss ICE Scale1 / 5 Displacement3.6 cc Bore16.0 mm Stroke19.0 mm CycleFour-Stroke Cylinder LayoutSingle-Cylinder, Vertical Cooling SystemEvaporative Open-Hopper Ignition SystemMechanical Trip-Point Igniter Ignition Power1× AA 1.5V Battery (not included) Spark Plug Thread3/16-40 Imperial (pre-installed) Governor TypeCentrifugal Flyweight LubricationFuel Pre-mix + External Drip Oiler Fuel-to-Oil Ratio25:1 to 30:1 Recommended Fuel92+ Octane Gasoline Recommended Oil2-Stroke or 4-Stroke 10W-50 Primary StructureSteel (CNC-Machined) Decorative HardwareSand-Cast Brass + Aluminum Surface FinishHigh-Temp Baked Enamel Coat Display BaseHardwood (pre-mounted) Overall Dimensions135 × 115 × 195 mm Product Weight1,500 g (3.3 lb) Assembly StatusRTR — Ready to Run Starting MethodsManual Recoil / Electric Drill // Features Built Without Compromise 01 Cast + CNC Composite Construction The structural core starts with premium sand-cast brass — the same process used on full-size industrial hardware — then every critical surface is finish-machined on a CNC center. Tighter tolerances, sharper edges, smoother bores. At 1.5 kg the heft is immediately apparent. This is a piece you pick up once and never put down. Cast + CNC Composite Process 02 Fully Open-Crank Architecture Every moving part is exposed. Watch the piston reciprocate, the connecting rod sweep, and the mechanical ignition points trip in real time. All four strokes unfold in front of you — intake, compression, power, exhaust. Nothing hidden, nothing sealed away. Open Crank · No Cover Plates 03 Visible Glass Drip-Feed Oiler A fully adjustable glass drip oiler delivers lubrication drop by drop to the crankshaft bearings — visible in real time. The same system that kept full-size early American stationary engines alive on the factory floor, now on your desk. Standard 10W-50 oil, no specialty products required. Pre-mix + External Drip Oiler 04 Evaporative Hopper Cooling The open-top water hopper absorbs combustion heat and releases a gentle mist of steam as it evaporates — exactly as it did in the field a century ago. Fill with tap or distilled water, top off for extended runs. No radiator, no pump, no closed loop required. Open Hopper · Steam Venting // Manufacturing Upgrade We Heard You. We Fixed It. ⚙️ Cast + CNC. Not Cast Alone. Early collectors were right to notice: pure casting leaves interior cavities rough, exterior edges soft, and bearing fits inconsistent. The N01 addresses this with a full CNC finishing pass across every critical surface after casting. The result is tighter bearing clearances, cleaner exterior geometry, and an engine that runs more quietly from the first start — not after a break-in period. Tighter Tolerances · Quieter Running 🔩 Steel Where It Matters. All-brass construction looks great at unboxing. It wears fast under load. Brass creeps under sustained stress and distorts with heat — which is why early miniature engines developed play in their bearings and lost compression over time. The N01's primary load-bearing components are machined from steel: harder, stronger, dimensionally stable across thousands of cycles. Brass stays where it belongs — as accent hardware and bearing surface. Steel Core · No Long-Term Wear Creep 🎨 Finish That Lasts. Early production used spray lacquer — which chips off flywheel edges, fades with heat, and looks worn within a season of running. The N01 uses a high-temperature baked enamel coat bonded directly to the steel substrate. It survives engine heat, vibration, and outdoor humidity without lifting or chalking. The color you receive is the color it keeps. Baked Enamel · Weather-Resistant 🔧 Metal Sealing Ring. Not Rubber. Early models used rubber O-rings as the primary cylinder seal. Rubber degrades with heat and fuel exposure — it swells, hardens, and eventually loses its seal, causing compression loss and oil leaks after extended use. The N01 replaces this with a precision-machined metal sealing ring: dimensionally stable at operating temperatures, chemically inert to gasoline and oil, and designed to maintain compression integrity across the long term. Metal Ring · No Rubber Degradation Specification Early Generation N01 Current Production Primary Structure All-brass casting Steel — CNC-machined Manufacturing Process Casting only Cast + CNC finish pass Bearing / Assembly Fit Hand-fitted, inconsistent CNC-controlled, consistent Surface Finish Spray lacquer High-temp baked enamel Long-Term Wear Brass creep / bearing play Dimensionally stable steel Weather / Heat Resistance Chips, fades over time Sealed, heat-bonded coat Operating Noise Wider tolerances = more rattle Tighter fit, noticeably quieter Cylinder Seal Rubber O-ring (degrades with heat & fuel) Precision metal sealing ring Overall Quality Grade Entry-level collector 1–2 tiers above early gen // Starting Methods Two Ways to Wake It Up Vintage Method Manual Recoil Start Wrap the included starter cord around the flywheel pulley and pull. The same ritual that started full-sized American farm engines on cold mornings — immediate mechanical feedback, no adapter, no batteries required. Modern Method Electric Drill Start Chuck the included adapter rod into any cordless household drill, engage the starting shaft, and spin the engine to life in seconds. Ideal for quick demos, cold starts after storage, or fine-tuning the needle valve mid-session. // Finishes Three Period-Accurate Colorways Each finish references a real tradition in American stationary engine history. All three share identical steel hardware, mechanical components, and hardwood display base. Click any image to view and order on the product page. View Product → Industrial Blue Steam-era American machinery. Clean, workmanlike, factory-floor honest. Classic View Product → Field Green Deep farm green is the most historically resonant finish in early American stationary engine collecting. The classic color of the 1900–1930 era. Brass + hardwood + green = museum shelf. Collector's Choice View Product → Barn Red Early American factory red. Bold, warm, and unmistakably industrial. Classic // In the Box Everything You Need to Run ⚙️ N01 Engine Assembly With hardwood base & spark plug pre-installed 🔩 Drill Starting Adapter Rod Fits standard cordless drills 🪢 Manual Recoil Cord & Handle Included, ready to use 📖 Official User Manual Tuning, fuel mix & first-run guide ⚠ Not included — you'll need: 1× AA 1.5V battery · 92+ octane gasoline · 10W-50 oil (2-stroke or 4-stroke) // FAQ Common Questions Is it fully assembled when it arrives?+ Yes. The N01 is a true RTR (Ready-to-Run) build. The mechanical architecture, trip ignition system, and hardwood base are fully assembled and factory-tested before shipping. You only need 1× AA 1.5V battery and 92+ octane gasoline mixed with 10W-50 oil at a 25:1 to 30:1 ratio. Do I need specialty oil for the drip oiler?+ No. Standard 2-stroke or 4-stroke 10W-50 motorcycle or automotive oil works for both the fuel pre-mix and the external drip oiler. One oil type covers both lubrication systems — no specialty products required. How does the water cooling work?+ This replicates early "evaporative hopper cooling." Water sits in the open hopper above the cylinder, absorbs combustion heat, and steams off during operation. Fill with clean tap or distilled water before starting and top off for extended sessions. No plumbing, no pump, no closed circuit needed. Can the engine speed be adjusted?+ Yes. The centrifugal flyweight governor sets the target RPM automatically — the hit-and-miss logic then fires or coasts to maintain that speed. You can fine-tune the governor setting and the carburetor needle valve to adjust how frequently the engine fires, giving you direct control over both speed and the cadence of the "miss" rhythm. How long can it run on a single fill?+ Runtime depends on your governor setting and ambient conditions. The fuel tank is sized for desktop demonstration runs — typically 10–20 minutes per fill at normal operating cadence. The water hopper holds enough for a similar duration. For extended display sessions, top both off periodically. No minimum warm-up time is required. Is needle valve tuning difficult for beginners?+ Not at all. The carburetor needle valve and mechanical ignition timing are pre-set to optimal baseline at the factory before shipping. For most users the engine fires straight out of the box. If you want to fine-tune the "miss" cadence for your altitude or ambient temperature, the included Official User Manual walks through every adjustment step by step. — RETROL × OKMO · N01 · 1/5 Scale Hit-and-Miss Engine — AVAILABLE JUNE 18, 2026 RTR · Factory-Tested · Shipped in Custom Shockproof Carton Steel + Brass + Aluminum · High-Temp Baked Enamel · Hardwood Base Shop Now Ships from Sep 15, 2026 · Pre-order to lock in your price