Meteor 250 Piston 72.5MM

• made in Italy by Meteor – trusted piston specialist since 1952
• premium aluminium alloy – lightweight, strong, and durable
• precision machining ensures perfect fit and consistent performance
• excellent wear resistance extends piston and engine life
• smooth power delivery – reliable performance in trials conditions
• complete kit for easy installation – piston, rings, pin, and circlips included
• available in different piston size codes (A/B/C, etc.) – match with the code stamped on your cylinder for correct fitment

The Meteor piston is a high-quality replacement piston designed for trials motorcycle engines. Manufactured in Italy by Meteor, a company with decades of expertise in piston production, it combines reliability, durability, and precision engineering. Made from premium aluminium alloys, this piston ensures smooth power delivery, excellent wear resistance, and long service life – keeping your trials bike running at its best.

• Gas Gas Pro/Racing/GP 250 02-25

Most trials motorcycles use pistons available in size codes A, B, C, and sometimes D). These codes represent very small differences in piston diameter – usually only a few hundredths of a millimeter – to match the gradual wear of the cylinder.

From new – your cylinder is stamped with a code (e.g. “A”). The factory installs the matching piston (A).

1. first replacement – you can usually fit another piston of the same code if cylinder wear is minimal
2. next replacement – once the cylinder has worn further, you must move to the next size code (e.g. A → B → C)
3. when all codes are used – the cylinder must be re-plated or replaced to restore proper clearances

Example progression:

• cylinder stamped A → First piston: A → Second piston: B
• cylinder stamped B → First piston: B → Second piston: C
• and so on…

⚠️ Important: Always check the size code stamped on your cylinder before ordering. Using the wrong piston size can cause poor performance, excessive wear, or engine damage.

• standard diameter – 72.5mm
• compression – 28.7mm
• head type – barrel head
• head – 3.8mm
• total length – 66mm