PERFORMANCE PISTON KITS FOR HARLEY DAVIDSON SPORTSTER

• SPAWNED FROM THIS SUCCESSFUL MANUFACTURER'S LINE OF AUTOMOTIVE PISTONS
• LIGHTWEIGHT , PERMANENT MOLD CAST PISTONS
• MANUFACTURED FROM HYPEREUTECTIC 390 ALLOY , CONTAIN 16-18% SILICON AND HEAT TREATED TO T6 SPECIFICATIONS PRODUCING A STRONGER THAN STOCK PISTON
• SPECIAL ALLOY COMPOSITION KEEPS HEAT CONFINED TO THE COMBUSTION CHAMBER AND REDUCES HEAT TRANSFER TO THE PISTON ITSELF PRODUCTION A COOLER RUNNING PISTON
• PISTON EXPANSION IS REDUCED BY AS MUCH AS 20% OVER CONVENTIONAL PISTONS
• LESS PISTON ROCK , BETTER RING SUPPORT , MORE DURABILITY , AND BETTER RETAINED COMPRESSION FOR MAXIMUM POWER
• THE KEY FEATURE TO THESE PISTONS IS THE ACCUMULATOR GROOVE BETWEEN THE TIP AND SECOND RING WHICH AVERAGES THE NORMAL PRESSURE BETWEEN THE FIRST AND SECOND RING , KEEPING THE PRESSURE LOW ENOUGH TO PREVENT LIFTING OF THE TOP RING WHILE MAINTAINING PRELOAD ON THE SECOND (OIL SCRAPING) RING
• EACH SET OF PISTONS INCLUDES WRIST PINS , SPIRAL LOCKS , ENGINE ASSEMBLY LUBE , AND HASTINGS MOLY RINGS
• ORDER 65199 FOR REPLACEMENT WRIST PIN LOCK (SOLD EACH)
• WRIST PINS MEASURE .792" O.D.
• REPLACEMENT RINGS ARE AVAILABLE
  KB PERFORMANCE PISTONS
  FITS IRONHEAD SPORTSTER 1972/1985 1000CC (61CI)
  STANDARD BORE =3.188"
  8.2:1 COMPRESSION RATIO DOME TOP PISTON
  +.020" BORE
  NOTE: IT IS NOT RECOMMENDED TO BORE 1972/EARLY 1973 MODELS MORE THAN +.030"
  BY: KB PERFORMANCE PISTONS