Size:010-825K - STD. 81.00mm This Yamaha Piston Kit will fit all 701cc (61X) no window Port, All Models 2 Cylinder 81.00mm STD Bore. Kit comes complete with all parts needed to replace one piston (2 required per motor). Fit Models: FX1 - 1994-1995 Super Jet - 1994-2016 VXR Pro - 1993-1994 Wave Blaster - 1993-1996 Wave Raider - 1997 Wave Runner III - 1994-1995, 1997 Piston Sizes: 010-825K - STD. 81.00mm 010-825-04K - 0.25mm (81.25mm) 010-825-05K - 0.50mm (81.50mm) 010-825-06K - 0.75mm (81.75mm) 010-825-07K - 1.00mm (82.00mm) Please Note: STD bore is a direct fit and does not need boring, a light hone to break the glaze is fine for seating the new rings. However, if there is damage or excessive wear to your cylinder, (Check factory spec clearances below) then your cylinder will need to be bored oversize and you will need to purchase the correct oversize that will remove all scoring in the sleeve. Refer to you service manual for more information. Piston OEM# 61X-11631-00-93, 61X-11631-01-93, 61X-11631-02-93 Factory cast piston to wall clearance .004-.0045" Piston Kit includes: 1 Piston 1 Ring Set (Japanese RIK Performance TOP industry quality Ring sets). 1 Pin 2 Clips Please be advised to check all information available such as the OEM #'s and piston bore size to identify your engine to the correct kit. If you are uncertain about which kit you need, please write us for assistance. Be sure include Make Model & Year or other information if you do not have it. At PwcEngine,com we offer the highest quality top name brands.