6H1-11631-03-95 Yamaha Piston Kit STD | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Standard-Bore Piston Kit - Part Number: 6H1-11631-03-95

A genuine Yamaha standard-size piston assembly for selected 48HP to 90HP two-stroke outboards using the inline two-cylinder or three-cylinder engine family.

This standard-bore piston is used during powerhead rebuilding when the cylinder remains within Yamaha's original bore specification. Matching piston rings, wrist pin and retaining clips must be confirmed against the supplied package and engine model before assembly.

⚙️ Key Features

• Genuine Yamaha OEM standard-size piston

• Correct Yamaha part number 6H1-11631-03-95

• Nominal standard bore approximately 82mm

• Used on selected Yamaha 48HP to 90HP two-stroke engines

• WSM, GLM, Sierra, Mallory and Wiseco piston kits available

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 6H1-11631-03-95 current standard-grade Yamaha piston reference

• 6H1-11631-01-96 related earlier standard piston reference

• 688-11631-03-94 related Yamaha standard piston reference

• 688-11631-02-96 related Yamaha standard piston reference

OEM / Related Numbers:

• 6H1-11631-03-95

• 6H1116310395

• 6H1-11631-01-96

• 688-11631-03-94

• 688-11631-02-96

• 688-11603-A0 related standard piston-ring set

• 6H1-11633-00 related piston pin

• 93450-20025 related piston-pin circlip

Aftermarket / Verified Equivalents:

• WSM: 100-265K

• GLM: 24760

• Sierra: 18-4097

• Mallory: 9-53815

• Wiseco: 3131 standard forged piston kit

• Asaki: 688-11631-03 standard piston kit

🚤 Compatibility

Commonly used on:

• Yamaha inline two-cylinder and three-cylinder two-stroke powerheads

• Standard-bore engine rebuilds

Typically suits:

• Engine models:

• Yamaha E48 two-stroke

• Yamaha C55 and 55HP two-stroke

• Yamaha C75, E75 and P75

• Yamaha C80

• Yamaha C85 and 85HP

• Yamaha B90, C90 and 90A

• Yamaha 90TJRS, 90TLRS, 90TJRT, 90TLRT, 90TJRU and 90TLRU

• Yamaha 90TJRV, 90TLRV, B90TLRV, C80TLRV and C90TLRV

• Yamaha E48MLHV, E75MLHV, P75TLHV and related standard-bore applications

• HP Range: 48HP - 90HP

• Engine Type: Yamaha carburetted two-stroke outboard

• Year Range: Approximately 1984 - 2009, dependent on model and piston grade

🔌 Function

The piston transfers combustion pressure through the connecting rod to the crankshaft while the piston rings seal compression and control combustion gases within the cylinder.

Common signs replacement is required:

• Low or uneven cylinder compression

• Piston skirt scoring or seizure damage

• Broken or stuck piston rings

• Excessive piston-to-cylinder clearance and piston slap

• Crown damage caused by detonation, overheating or lean operation

📦 Condition

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging