Keith Black dish piston set is .040 oversize with a 9.0:1 compression ratio for 1986-up XL Evolution models.

VT No: 11-2233
Keith Black dish piston set is .040 oversize with a 9.0:1 compression ratio for 1986-up XL 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 .040 over sized, 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. 2009-UP XL 883 cylinders cannot be overboard to 1200cc. 2009-UP applications will require separate purchase of 1200cc cylinders to be used with piston kit. **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 1986-UP
UOM: 1 - SET
Country of Origin: Imported

Manufacturer: Keith Black
2018 Catalog pages: 860

2017 Catalog Page: 860

V-Twin Manufacturing Part Number: 11-2233
Manufacturer: Keith Black
Manufacturer Part Number: KB272 .040

Harley-Davidson & Indian OEM Cross Reference Part Numbers:            

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