Vertex 4 Stroke Piston Kit for GasGas 250cc - Vertex Piston Kits

Manufactured in Italy, Vertex, the premier brand of OEM replacement pistons, is the OEM supplier to KTM and numerous European motorcycle and go-kart manufacturers. Vertex offers enthusiasts state-of-the-art, high-quality pistons for nearly any powersport use, from motorcycles and ATVs to marine and karting. Manufactured to the highest standards in Japan, Vertex’s piston rings are produced by the OEM suppliers so that they are direct OEM replacements. Vertex is the choice of those who truly seek the optimum in powersport performance in any application.

What size piston do I need?

If you are just replacing the piston, then you need to first know the bore of the cylinder. This can be done by using a bore gauge to find the diameter or by reading the owner’s manual to find the bore specifications. Ultimately, the bore should be measured for the best possible results. After the diameter is known, then you can pick which size piston will work best in your cylinder. Remember to maintain about a 0.05mm (0.002”) piston to cylinder clearance, depending on application.

Vertex offers A, B, C, D, sizes so that the customer can properly fit each piston to the cylinder. The difference in the sizes is 0.01mm (0.0004") increments, with A being the smallest and D the biggest. When a cylinder wears, the customer can choose the next larger piston size to regain the proper factory fitment.

Why are Vertex Cast pistons better than forged? 

When it comes to power and performance, Vertex four-stroke pistons are hard to beat. Forged from the highest quality 2618 aluminium alloy, Vertex pistons are perfectly suited to handle the rigours and high pressures of today's modern four-stroke engines. Plus, to aid in the break-in process and reduce wear, every Vertex piston utilises a unique Molybdenum Disulphide (MOS2) coating on the piston skirt.

But, what truly sets Vertex apart from the competition is the unique piston profiles and compression ratios that are offered in A, B, C and D sizes. This variation in sizing, a mere 0.01mm, allows the piston to be perfectly sized to the cylinder for maximising power and performance while reducing blow-by and oil consumption.

Vertex Piston Kit features:

• Precision Fit: Available in exact A, B, or C sizes to match your cylinder bore perfectly, maximising power and performance while minimising blow-by and oil consumption
• 4-Stroke Pistons: Forged from high-strength 2618 or 3032 alloys for exceptional durability and reliability.
• Advanced Skirt Coating: High-tech Molybdenum Disulphide (MOS2) coating reduces wear and improves break-in performance
• Comprehensive Kit: Each kit includes a piston, rings, wrist pin, and circlips
• Standard OEM replacement kits are plug-and-play, including piston, rings, wrist pin, and circlips. They are designed for direct compatibility
• Replacement rings are sold individually

Please note: that the image in this listing is just an example image.  The piston you receive will be the exact shape and size for the OEM replacement required for your bike.