S&S Cycle 2017+ M8 Touring 4.5in Bore MK-Series Crankcase Assembly

The demand for performance-based parts is growing, and these M8 engines are creating more power daily. All that power requires a quality base that the stock cases can't provide. This new version of the MK-Series Crankcases are ready for even more than the originals. These cases are designed to accept cylinders up to 4 1/2", which is massive! Like the originals, these cases scrape more oil than stock and offer more reliability, all without frame modifications.

• Redesigned, with 4.695" spigot bore to accept larger bore cylinders
• Machined, close-fitting oil scraper (stock is as cast)
• Large volume sump
• Stock deck height