S&S Cycle Engines — 2017-2023 Harley-Davidson Touring

S&S Cycle MK136 crate engine for 2017-2023 Harley-Davidson Touring models, a 136-cubic-inch performance displacement built on S&S forged crankcases with high-flow cylinder heads and oversized valves. Complete, ready-to-install replacement for Milwaukee-Eight Touring powerplants.

Features

• 1mm oversized intake and exhaust valves with .030" longer valve train geometry
• 0.605" max-lift valve springs
• Forged pistons with S&S performance oil pump and cam support plate
• Patented dual-spray piston cooling jets and enlarged oil sump
• High-flow cylinder heads with premium seats, guides, and seals
• Billet aluminum covers and premium tappets
• Champion spark plugs included

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 310-1290
• Displacement: 136 cubic inches
• Weight: 173 lb
• Category: Engine Components / Engines

Fitment

Fits 2017-2023 Harley-Davidson Touring models with Milwaukee-Eight (M8) engine mounts.

Frequently Asked Questions

Is this a complete engine ready to bolt in?

Yes. This is a crate engine with all internals, heads, and covers assembled and ready for installation into your M8 Touring frame.

What's the horsepower increase over stock M8?

The input does not specify horsepower figures. Contact S&S Cycle directly for dyno numbers on your specific model.

Will this fit my 2016 or earlier Touring?

No — this engine is engineered for 2017-2023 Harley Touring models with M8 mounts. Older Twin Cam models require a different S&S crate engine.

What's included in the box?

The complete assembled engine with all internal components, cylinder heads, covers, and spark plugs ready to install.