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OKMO Friction Clutch Pulley P51 New
OKMO Friction Clutch Pulley
P51
Take your miniature engine beyond mere visual appeal—unleash real mechanical power via belt drive to operate external devices such as generators, water pumps, and fans, and experience a genuine desktop-scale power system.
Product Overview
Precision CNC-machined friction clutch pulley, designed specifically for the full range of OKMO micro internal combustion engines.
OKMO Friction Clutch Pulley
- Material: Stainless steel + brass
- Processing: CNC Precision Milling
- Transmission: Friction clutch + O-ring belt drive
- Shaft Compatibility: Compatible with OKMO standard output shaft specifications.
- Installation: Secured by set screws; direct fit with no modification required.
- Working Principle: The clutch is manually engaged to transmit power while the engine is running, and manually disengaged at idle.
Why a Clutch Pulley?
- Power Output: Convert engine RPM into usable mechanical power
- Overload Protection: Friction clutch slips under excessive load, protecting the engine
- Smooth Start/Stop: Eliminates startup shock from direct rigid coupling
- Multi-Device Drive: One engine can drive multiple external devices in series
- DIY Expansion: Unlocks unlimited modification possibilities for your engine model
- Display Upgrade: Transform a static model into a dynamic interactive exhibit
Compatible Engine Models
Verified through real-world testing — the following OKMO engines are fully compatible with this clutch pulley assembly
| Engine Model | Type | Displacement | Cooling | Compatibility | Recommended Application |
|---|---|---|---|---|---|
| OKMO 1140 | 1/8 Micro 4-Stroke Gasoline | 3.6cc | Water-cooled | Perfect Fit | Generator / Water Pump |
| OKMO 916 | High-speed, high-torque engine. | 3.6cc | Water-cooled | Perfect Fit | Fan / Conveyor System |
| OKMO B01 | Ball Top Monitor Hit-and-Miss | 3.6cc | Water-cooled | Perfect Fit | Generator / Small Machinery |
| OKMO B02 | Mini Hit & Miss Farm Style | 3.6cc | Evaporative | Perfect Fit | Water Pump / Grinder |
| OKMO 1110 | Yanmar Style Engine | 3.6cc | Water-cooled | Perfect Fit | CNC / Water Pump / Fan |
| OKMO D-Type Centennial | Stationary Internal Combustion | 3.6cc | Water-cooled | Perfect Fit | Generator / Display Unit |
| OKMO Z01 | Throttle-Regulated Gasoline | 3.6cc | Water-cooled | Perfect Fit | Variable-Speed Applications |
| OKMO N01 (Coming Soon) | Vertical Single-Cylinder Gasoline | 3.6cc | Water-cooled | Confirmed Compatible | All-Scenario |
Compatibility verified against OKMO standard output shaft specifications. Before installation, please confirm your engine output shaft diameter matches the pulley bore size.
Application Scenarios
From generating electricity to pumping water, from driving fans to powering small machinery — let your engine truly "work"
Scenario 01
Drive a Micro Generator → Light Up LEDs
The engine drives a 12V DC micro generator via the pulley, steadily outputting current to power LED bulbs or charge small batteries. The most visual way to demonstrate "internal combustion power generation" — ideal for educational demos and interactive displays.
Recommended Engines: 916 / B01 / 1140 / D-Type
Scenario 02
Drive a Centrifugal Pump → Water System
The pulley connects to a small brass centrifugal pump, enabling real water pumping. Recreates the historic farm-engine irrigation scenario from a century ago, and is also a perfect way to showcase belt transmission efficiency.
Recommended Engines: B02 / 1110 / 1140
Scenario 03
Drive a Fan → Desktop Cooling
Engine power is transmitted via belt to a brass-blade fan, spinning at high speed to generate real airflow. The coolest "air conditioner" in any retro study — pure mechanical drive, zero electricity consumption.
Recommended Engines: 1110 / Z01 / B02
Scenario 04
Drive Small Machinery → DIY Workshop
Connect to a small bench grinder, wood lathe, or conveyor belt system to build a miniature mechanical workshop. Multi-stage pulley ratios let you precisely control output speed for different tool requirements.
Recommended Engines: 1110 / 916 / D-Type
How It Works
How the friction clutch pulley enables your engine model to deliver real, usable mechanical power
Engine Running
Start the OKMO micro engine; the crankshaft begins rotating and outputting torque
Clutch Engaged
When the clutch disc is manually advanced and the friction disc is pressed against the pulley, power transmission begins immediately.
Belt Transmission
The O-ring belt transfers rotational power from the drive pulley to the driven pulley / external device
Device Running
Generator produces electricity, pump moves water, fan spins — mechanical power becomes reality
Key Advantages
Why choose the genuine OKMO clutch pulley
Plug & Play
No modifications required—simply mount it onto the OKMO engine flywheel and secure it with the set screw; installation takes just 5 minutes.
Overload Protection
The friction clutch automatically slips under excessive load, preventing engine damage and extending service life
High Efficiency
CNC precision machining ensures pulley runout under 0.02mm, with transmission efficiency above 95%
Multiple Ratios
Supports various pulley diameter combinations for easy speed-up or speed-down to match different device requirements
Genuine Quality
Produced in the same factory as OKMO engines — material, craftsmanship, and precision perfectly matched
Educational Value
Visually demonstrates core mechanical engineering concepts: belt drives, clutch principles, and power transmission
Installation Guide
Simple 4 steps — complete installation in under 5 minutes with no specialized tools
Check Engine Status
Ensure the engine has fully cooled, turn off the power switch, and remove the spark plug cap
Mount the Pulley
Slide the clutch pulley onto the engine output shaft, align with the keyway, and tighten the set screws
Mount the Driven Device
Secure the generator / pump / fan to a solid wood base next to the engine, aligning the pulleys
Tension the Belt
Loop the O-ring belt on, then adjust the device position so the belt is properly tensioned (approx. 5mm deflection when pressed at midpoint)
Installation Notes
- Before first startup, manually rotate the flywheel to confirm there is no binding
- Belt tension must be just right — too tight strains the shaft, too loose causes slippage
- Check that all pulley screws are fully tightened before running
- Mount all components on a solid wood base for stable operation
- For first run, break in at low speed for 10 minutes before gradually increasing load
- Periodically apply a small amount of grease to the friction disc contact surface
Frequently Asked Questions
Answers to common questions about the OKMO Friction Clutch Pulley
It fits all engines with the standard OKMO output shaft specification, including 1140, 916, B01, B02, 1110, D-Type, Z01, and more. N01 compatibility has been confirmed. Please verify your engine output shaft diameter before ordering.
The friction clutch is a critical safety component. It allows the engine to idle without driving the external device (reducing wear), and automatically slips under sudden load spikes to protect the engine from stalling. A direct rigid connection without a clutch makes starting difficult and risks engine damage.
OKMO micro engines produce approximately 0.2 PS (~150W). After transmission losses, the usable output is about 100–120W — suitable for small DC generators (12V/10W LED lighting), micro water pumps, small fans, and other low-power devices.
Belt slippage usually has three causes: (1) Insufficient tension — adjust device position to increase tension; (2) Worn belt — replace with the spare O-ring ; (3) Excessive load — reduce the driven device load or switch to a larger drive pulley diameter.
Yes. Using multi-stage pulley in series, one engine can drive 2–3 low-power devices simultaneously — for example, engine → generator + fan at the same time. Just ensure the total load does not exceed the engine's rated output.
Standard package includes: Friction Clutch Pulley × 1, Set Screw Kit × 1, Installation Manual × 1. External devices such as generators and pumps are sold separately.
Ready to Unleash Your Engine's True Potential?
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