Harddrive M8 Cylinders - 124 Black W/Machined Fins PR — Harley-Davidson (2017-2024)

Harddrive M8 big-bore cylinders for V-twin motorcycles, sold as a pair with powder-coated black finish and machined cooling fins for an OEM appearance. Direct fit for Wiseco K2787 pistons and compatible with Cometic Head and Base gasket kits without modifications.

Features

• Powder-coated black finish with machined fins
• M8 big-bore cylinders sold as a pair
• Compatible with Wiseco K2787 pistons
• Works with Cometic Head and Base gasket kits without modification
• No machine work required

Specifications

• Brand: Harddrive
• Manufacturer Part #: 88186
• UPC: 191361123412
• Length: 21.2 in
• Width: 11.02 in
• Height: 11.02 in
• Weight: 11.02 lbs
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles equipped with Milwaukee-Eight (M8) engines. Verify piston compatibility and gasket sizing before ordering.

Frequently Asked Questions

What pistons do these cylinders accept?

These M8 cylinders are designed for Wiseco K2787 pistons, sold separately. Confirm your piston part number before assembly.

Do I need new gaskets?

Gaskets are sold separately. Cometic Head and Base gasket kits (see part numbers in product details) install without modifications to these cylinders.

Are these sold individually or as a pair?

M8 cylinders are sold as a pair — both cylinders needed for a complete big-bore setup.

Will these fit my M8 engine without machine work?

Yes — when paired with compatible pistons and Cometic gasket kits, no cylinder porting or machine work is required.