Yamaha Genuine Chappy LB50 Crankcase 2 439-15121-04
Yamaha Genuine Chappy LB50 Crankcase 2 439-15121-04
Low stock: 1 left
Couldn't load pickup availability
Product Description
Brand new official Yamaha factory right-hand crankcase half designed for classic vintage two-stroke 50cc/80cc step-through minibikes. Precision-cast and line-bored to exact factory metallurgical and dimensional tolerances, engineered to pair seamlessly with Crankcase 1 during a complete bottom-end engine rebuild to eliminate mechanical play, restore primary compression, and ensure absolute structural alignment.
Vehicle Compatibility
Engineered explicitly for Yamaha classic air-cooled two-stroke Chappy minibike platforms.
Verified catalog fitment layout:
| Make | Model Family | Engine Type / Displacement | Model Years |
| Yamaha | Chappy LB50 / LB50-2AM (439 / 3WH series) | 49cc (2-Stroke Air-Cooled Minibike Single) | 1970s–1990s |
| Yamaha | Chappy LB80 / LB80-2AM (Related Variants) | 72cc (2-Stroke Air-Cooled Minibike Single) | Vintage Era |
Fitment & Technical Details
Inspect all internal bearing bores, dowel pin locating surfaces, and gasket mating faces for absolute cleanliness prior to assembly. Because two-stroke crankcases are precision factory-matched pairs, ensure both halves share matching casting serial numbers if replacing as a set, and warm the main bearing housings evenly during crankshaft installation to prevent side-load distortion.Verification: Mates precisely with the left crankcase half along the center gasket plane with zero offset or bearing bind, maintaining exact alignment for the crankshaft and transmission shafts.
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.
