Try a brand, part number or a shorter search term. We can help you find the right part.
Or browse: Air filters Spark plugs
PROX
PISTON KIT XT660R/X+MT-03 PISTON KIT FORGED 99.96MM B — voor o.a. YAMAHA MT-03 660 (2006–2013)
Regular price
184,38
Store - Out of stock
Online - In stock
Dispatched within 2–5 working days
In stock at our supplier. We dispatch this product within 2–5 working days.
Buy now. Pay in 30 days.
Waarom kiezen voor MXProstore?
Does this fit your bike?
View verified vehicle applications for the selected variant.
Source: Parts Europe · 10-11-2026. Check the exact variant and application notes.

Product description
Cast Piston KitProX piston designs are usually similar to the OEM/stock configurations, although sometimes these designs are adjusted whenever the ProX engineers discover an opportunity for increased performanceProX cast pistons are very stableProX cast pistons are made through gravity casting using aluminum alloy with approximately 18 percent silicon contentSilicon plays a vital role in ProX’s cast piston manufacturing, as it decreases thermal expansionProX two-stroke pistons are manufactured for both cast iron cylinder bores and Nikasil cylinder boresRegarding Nikasil cylinder bores, ProX offers a variety in oversizes graded in A/B/C/D sizing, each going up 0.01mm in diameterSpecificaties Units Kit Engine Type 4-Stroke Piston Size Standard Size B Compression Ratio 10,0:1 Product Name Piston Kit Piston Diameter 99,96 mm Style Cast Replica Ring Material Steel Riding Style Off-Road Piston Material Aluminum Alloy| Cast Research Value Finalized
Specifications
Manufacturer and product safety
Manufacturer
Race Winning Brands Europe B.V. (ProX)
Pesetaweg 27
2153 PJ Nieuw-Vennep
Netherlands
powersports@rwbteam.eu
Our reviews
What are your predecessors' experiences?