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Tired of your engine straining during pull-starts because the belt is always locked to your drive setup? The OKMO P51 Friction Clutch Pulley adds a true manual clutch system to your miniature engine—allowing you to start load-free, idle smoothly, and engage power only when you’re ready.
Precision-engineered specifically for OKMO 1110, 1140, B02, Z01, N01 and 916 models and fully compatible with all new OKMO models, including B03 through B12. . Direct replacement with zero shaft or mounting hole modifications required.
Because the flywheel diameter of the RETROL HM-01 engine differs from standard OKMO series engines, this upgrade accessory is released in two distinct size versions. Please check your engine model before selecting:
Standard OKMO Compatible Version: Designed for OKMO 1110, 1140, B01, B02, Z01, LD-A1, N01, and other compatible miniature engines.
Outer Diameter: 37 mm
Height: 46 mm (Unlocked) / 42 mm (Locked)
RETROL HM-01 Dedicated Version: Because the HM-01 features a larger flywheel diameter, this dedicated version is sized up accordingly to ensure a precise, seamless fit.
Outer Diameter: 40 mm
Height: 50 mm (Unlocked) / 46 mm (Locked)
Both versions share the same precision-machined all-metal P51 construction and power-engagement features, but they are not interchangeable due to the engine flywheel differences. Please select the correct version that matches your specific engine model.
| Model Code | OKMO-P51 |
| Type | Manual Friction Clutch Belt Pulley Assembly |
| Material | Machined Alloy Metal |
| Outer Diameter | 37 mm |
| Adjustable Height | 46 mm (Disengaged) / 42 mm (Engaged) |
| Weight | 280g (Net) / 350g (Package) |
| Recommended Age | 16+ |
Adds to the OKMO engine you love...and is really convenient for running accessories. Looks great! A real sign of OKMO's increasing ability and credibility. OKMO is no longer the Microcosm engine of 8 years ago
