Yamaha Genuine Passol II Cylinder Head 25K-11111-00
Yamaha Genuine Passol II Cylinder Head 25K-11111-00
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Product Description
Brand new official Yamaha factory cylinder head designed for classic vintage 50cc two-stroke micro-scooters. Precision-cast and machined to exact factory metallurgical and combustion chamber tolerances, engineered to ensure proper compression sealing, efficient thermal dissipation, and reliable power delivery for a concours-level engine rebuild.
Vehicle Compatibility
Engineered explicitly for Yamaha classic air-cooled two-stroke micro-scooter platforms.
Verified catalog fitment layout:
| Make | Model Family | Engine Type / Displacement | Model Years |
| Yamaha | Passol II (SA50 / 25K series) | 50cc (Air-Cooled 2-Stroke Scooter JDM) | Early 1980s–1985 |
| Yamaha | Passol (Early Sols / 2E9 / 25K variants) | 50cc (Air-Cooled 2-Stroke Scooter JDM) | Early Era |
Fitment & Technical Details
Inspect the spark plug threads and cylinder mating surface for absolute flatness and cleanliness prior to installation. Use a fresh head gasket, place the cylinder head squarely over the cylinder stud bolts, and torque the retaining nuts in a criss-cross pattern to factory service specification values.
Verification: Seats completely flat against the top of the cylinder block with zero compression leaks or combustion blow-by under operating pressures.
Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!
At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand.
Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.
We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.
Shipping Information
We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.
Please note:
- All parts are shipped from Cyprus (Europe).
- Customers outside the EU may incur additional import taxes based on the value of the item.
