POLINI Thermal Group D.59 stroke 57.9 158cc

The POLINI D.59 thermal group is designed to optimize the performance of your Yamaha BW’S – Zuma 125 scooter. With a bore of 59 mm and a stroke of 57.9 mm, this cylinder increases the displacement to 158 cc, ensuring superior power and a more responsive acceleration.

The kit includes a high-precision piston, equipped with a chrome-plated top ring and a ductile iron bottom ring, along with three 2 mm thick oil scraper rings. The cylinder is made of aluminum with a cast iron sleeve, ensuring robustness and durability over time. The kit is completed with a pin, two Ø15x1 pin retaining rings, and various gaskets for a perfect seal, including the cylinder base and head gasket.

For installation, it is essential to carefully follow the provided instructions, ensuring a correct installation and optimal engine operation. With the POLINI thermal group, your scooter will not only gain power but also reliability and longevity.

• Bore: 59 mm
• Stroke: 57.9 mm
• Displacement: 158 cc
• High-precision piston
• Chrome-plated top ring
• Ductile iron bottom ring
• Three 2 mm thick oil scraper rings
• Aluminum cylinder with cast iron sleeve
• Pin included
• Two Ø15x1 pin retaining rings
• Various gaskets for a perfect seal
• Cylinder base gasket
• Head gasket