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Since its early days, CISON has been crafting miniature inline 4-cylinder engines that captured the hearts of RC enthusiasts and collectors alike. From the classic Flathead to the previous OHV models, each generation brought new precision and charm. Now, the story continues with the all-new L4-205-OHV—the latest evolution in CISON’s engineering legacy. With higher displacement, increased power, and smoother operation, this next-generation engine isn’t just a model—it’s a fully functional miniature powerhouse. Build it yourself, tune it to life, hear it roar, and display it as a collector’s centerpiece.
In November 2022, we introduced the CISON L4-175 OHV Gasoline Engine, which set a new standard for miniature OHV engines. Today, the L4-205 OHV takes that legacy further: displacement is increased from 17.5cc to 20.5cc, power output is boosted by over 15%, and the piston rings, transmission, and exhaust have all been upgraded for smoother, more reliable performance. Every detail has been refined to deliver an unmatched hands-on building experience and authentic engine performance for collectors and RC enthusiasts alike.
| Feature | L4-175 OHV | L4-205-OHV | Upgrade Benefit |
|---|---|---|---|
| Displacement | 17.5cc | 20.5cc | +15% power output, more torque for demanding RC models |
| Cylinder Diameter / Stroke | 16.7 × 14mm | 18.5 × 19mm | Larger bore & longer stroke for higher efficiency and torque |
| Power Output | ~2.5ps | ~3.6ps | Stronger performance, ideal for heavy-duty RC vehicles |
| RPM Range | 1500-8000 rpm | 1800-11500 rpm | Wider speed range, more responsive operation |
| Transmission | Belt Pulley | Synchronous Pulley | Smoother, more accurate, higher efficiency |
| Piston Rings | Dual-ring | Three-ring with oil ring | Better sealing, emissions, stability, and reliability |
| Exterior Design | Red sports elements | Blue valve cover + black cylinder block, classic exhaust | Premium look, subtle diesel aesthetic, more collectible |
| Exhaust Design | Straight Pipe | T-shaped 4-in-1 Integrated Pipe | More visually striking, improved exhaust flow, richer engine sound |
Note: Mature design elements such as OHV valve mechanism, electric start, wet water-cooling, and independent lubrication system are retained for stable, reliable operation, giving you peace of mind while enjoying upgraded performance.
Ever bought a kit only to realize it’s mostly plastic?
With this kit, every part is precision-machined metal. You get to assemble a fully functional inline 4-cylinder engine that actually moves and responds like the real thing. It’s not just a model—it’s a miniature mechanical masterpiece you can hear, feel, and display.
Think small engines can’t deliver power? Think again.
The L4-205’s high-displacement OHV design and long-stroke configuration produce strong torque and responsive throttle, outperforming other engines of similar size. Pair it with your RC model and feel the difference—this is real performance, not just decoration.
Worried about overheating or worn-out parts?
With independent lubrication and wet water-cooling, this engine runs cooler, longer, and more reliably. The three-ring piston design improves sealing and stability, letting you enjoy hours of uninterrupted operation. No more short-lived kits that break after one session.
Tired of missing pieces and endless part hunting?
We’ve included everything you need: fuel tank, coolant reservoir, radiator, cooling fan, base stand, brackets, screws, and detailed instructions. Only fuel, oil, and battery need to be added. Every part is designed for easy installation, so you can focus on building rather than troubleshooting.
Worried it’s too hard to assemble?
Yes, this kit takes 12–20 hours depending on your experience. Yes, it has small delicate parts. But that’s the point—this is a hands-on engineering experience. Follow the step-by-step manual, and the reward is your very own functional engine that you built yourself.
Want your RC car to feel alive?
Lightweight, strong, and designed for 1/8 and 1/14 scale RC crawlers, trucks, and semi-trucks, the L4-205 acts as a custom “heart” for your model. With a sync pulley system and high torque output, your RC car runs smoother, faster, and more efficiently.
Looking for something to display proudly?
With blue valve cover + black cylinder block, metallic CNC finish, and classic diesel-inspired exhaust, this engine is as beautiful as it is functional. Whether it’s on your desk, shelf, or in a display cabinet, it commands attention.
Not sure what to gift your RC-loving friend or family member?
This kit is a mechanical engineering challenge and a collectible all in one. Perfect for hobbyists, RC enthusiasts, STEM learners, or anyone who loves hands-on experiences. Give it as a gift, and you’re giving hours of immersive building, real engine performance, and a centerpiece they’ll treasure.
Gasoline Pipe ×1
Oil Pipe ×2
Mechanical Start Harness Module ×1
CDI Igniter 4-in-1 Module ×1
Radiator (60mm Aluminum) ×1
Cooling Fan (6cm, 12V) ×1
Fuel Tank (75ml Plastic) ×1
Spark Plug ×4
Coolant Reservoir ×1
Coolant Bracket ×1
Fuel Tank Bracket ×1
Aluminum Alloy Engine Base Stand ×1
Water-Cooling Radiator Tank Assembly + Bracket + Screws ×1
L4 Engine Parts Kit (Unassembled) ×1
Instruction Manual ×1
Note: Fuel, oil, and battery not included for international shipping problem.
