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11-2247

Motorcycle 1200cc Piston Set .010 Oversize

Pistons

Keith Black flat top piston set is .010 oversize with a 8.9:1 compression ratio for 1988-up XL 1200cc Evolution models. The Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are .010 oversize, for a 3.498" bore and has a 9:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy. The high ring placement alone reduces detonation and increases the top ring temperature. **Note:Run engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears, in order to properly break-in new pistons and rings. Fits: XL 1988-UP UOM: 2 - SET Manufacturer: Keith Black 2011 Catalog pages: 798 11-1364 - 80" Shovelhead Piston Ring Set .010 SAV for Harley Davidson Motorcycles

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