Vertex 2 Stroke Piston Kit for Beta 300cc - 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? 

Because of a cast piston’s ability to contain higher silicon content compared to forged pistons, and because two-stroke engines have lower cylinder pressures when compared to four-stroke engines, cast pistons are ideal for two-stroke engines. Vertex pistons are gravity cast from an aluminium alloy with 18% silicon content.

Why is Silicon important?

• It decreases thermal expansion, which changes the geometry after the piston reaches operating temperature. With low thermal expansion characteristics, Vertex pistons can be run at tighter tolerances compared with forged pistons. This creates better power and performance, also making them less susceptible to rattling or breaking.
• Silicon gives the pistons better wear characteristics and prolongs piston life by decreasing wear on the piston skirt. Aiding in the break-in process and reducing wear, every Vertex piston has a Molybdenum Disulphide (MOS2) coating on the piston skirt.

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
• 2-Stroke Pistons: Contain 18% silicon to reduce wear and thermal expansion, enabling tighter running tolerances for increased power, reduced noise, and longer lifespan
• 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.