JE Pistons 370252 Dish 4.250" 128ci Big Bore Piston Set Harley M8 17-Up

• Forged from 2618-T6 aluminum for better aligned grain flow and higher tensile strength
• Skirt coating aids in optimal break-in for performance longevity
• High 11.0:1 compression ratio for improved performance
• Accumulator groove provides additional volume for combustion pressure

Specs

Bore Diameter 107.95
Piston Head Type Dish
Piston Volume -6.7
Pin Part Number 927-2500-15-51C
Piston Pin Inside Diameter 0.627
Piston Pin Length 63.50
Piston Pin Outside Diameter 0.927
Retainer Lock Part Number 927-073-MW
Ringset Included Yes
Ringset Number 4250VQ
Top Compression Ring Thickness 0.043
Second Compression Ring Thickness 0.043
Oil Ring Thickness 0.0787
Piston Material 2618
Forging Type Round
Piston Avg Weight 425
Compression Ratio 11.00:1