.Compatible Models: YAMAHA Majesty 125
.Clutch Spring Dimensions: D2.0X10.6X28L / D2.0X10.6X28.6L
.RPM: 1000 RPM / 1500 RPM / 2000 RPM
- Origin -
KOSO was officially established due to the realization that an independently developed brand is indispensable for future market marketing. Therefore, in 1989, KOSO was registered as a trademark of Tong-Ya. The name KOSO is derived from the Japanese words for "conception" and "high speed"; conception represents creativity, while high speed represents high-performance expression—combined, it reflects the company's hope to use creativity to create high-performance products!
- Spirit -
The brand spirit pursued by KOSO is to build quality, technology, and service on the foundation of integrity and mutual trust. We persistently uphold this attitude, not only manufacturing high-quality products but also pursuing product innovation and quality improvement, hoping to bring even more excellent products to everyone.
- Brand Journey -
Pursuing perfect product design and quality has always been our goal. Therefore, KOSO constantly spurs itself on by improving its own technology. We firmly believe that brand image and product quality are synonymous! Therefore, the company has strict requirements for product development, production processes, and quality control, hoping to achieve the goal of high quality while stepping onto the world stage. In the future, KOSO will continue to develop more user-friendly and innovative products, and hopes to become the next world number one from Taiwan within ten years, another pride of Taiwan, and the pride of the Taiwanese people.






※The vehicle model may have different specifications in different regions and may not be compatible for installation.
【Notes Before Ordering】
Before ordering, please double-check the color, size, and other information you wish to purchase.
Most products have lead times provided after the order is placed, so there may be situations where products are discontinued or require a long waiting period for shipment.
If an order cannot be fulfilled due to manufacturer stock shortages or temporary unavailability, it will not be processed; no charges will be incurred if the order is not processed.
Please be aware that manufacturers may unilaterally change specifications or exterior designs, which may result in the packaging or the product itself differing from the images on the product page.
If a manufacturer's unilateral change in product design or specifications prevents the product from performing as expected at the time of order, please consult our customer service for further assistance.
Products undergo multiple shipping processes from order to delivery, which may result in deformation or damage to the packaging, though the product itself remains intact and functional.
【Return Policy】
If you require a return, please apply through the returns section; please keep the product in its original condition and pack it securely in its original packaging.
Upon receiving your return request, we will arrange for a logistics provider to collect the item as soon as possible.
For returns due to non-human-induced defects, please apply within 7 days of receiving the product.
【Authenticity Guarantee】
For products with an authenticity guarantee, if they are found to be suspected counterfeits and confirmed by a court judgment following relevant litigation, we will compensate the customer 10 times the original purchase price.
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