Wiseco SET OF PISTON RINGS Ø85,50MM 4939D 100 SegmentsRef : WI00290A / 1004998

Segment set Ø85.50 mm for 4939D100 — Manufacturer's ref: W8550XX. This set by WISECO is designed for quads equipped with the 4939D100 piston and helps restore the seal between the piston and cylinder. Ideal for an engine overhaul, it replaces worn segments to limit compression leaks and oil passage into the combustion chamber.

• Diameter: Ø85.50 mm
• Manufacturer reference: W8550XX
• Brand: WISECO
• Application: replacement parts for quad (piston 4939D100)

This segment set is particularly suitable for the YAMAHA YFM 450 models listed below, for the 450 cc versions from 2009. Replacing the segments is one of the key operations when dealing with an engine that smokes, consumes oil, or has lost compression. Before installation, check the condition of the piston and bore, and adhere to the manufacturer's specifications for clearance and alignment during the break-in process.

• YAMAHA YFM 450 WOLVERINE 4WD (2009 - 450 cc)
• YAMAHA YFM 450 GRIZZLY CAMO 4WD (2009 - 450 cc)
• YAMAHA YFM 450 GRIZZLY 4WD (2009 - 450 cc)

Product intended for DIY enthusiasts and workshops: professional installation is recommended if you are not comfortable with engine restoration. Replace the segments with a suitable set to ensure the longevity and reliability of the engine block.