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(Delphi Ignition Systems or carbureted)
• Modeled after the early 90's Off-Road racing pattern
contributing to reduce the wear of the tyre and hence increase the mileage
• Width adjustment cuff / waist
Part #: JM-5831 Mfg #: 5831 Type Tool - Socket Units Each Weight 1
Keith Black Pistons KB258.010 +.010" Flat Top Pistons w/8.6:1 Compression Ratio for Big Twin 84-99 w/Evolution Engine (Delphi Ignition Systems or carbureted)Features & Benefits: * Bore = 3. 508in. * Stroke = 4. 250in. * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter piston to cylinder clearance. * Complete kit includes: two pistons, rings, wrist pins and clips. * Replaces OEM # 21942 83 Tech Tips: * 8. 6: 1 Compression Ratio with 80cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the