Ace Four
William Henderson's second inline-four design, so refined that Indian bought the tooling and turned it into the Indian Four.
Made to order: your copy is researched, fact-checked, and typeset to our standard, then delivered within about two weeks. We'll email you the moment it's ready.
Inside this volume
Known issues & a buyer's guide
The documented weak points for this exact model, how to inspect each, and what a proper fix costs.
Full specifications
Every published figure, engine and frame detail, and running change, with the conflicts flagged, not guessed.
Systems & maintenance
Engine, fueling, electrical, and chassis, plus service intervals and torque and fluid data.
Parts & community
Where the parts are, what cross-references, and the clubs and forums that keep the model alive.
Make it your bike.
We fold in your year, your engine and options, your rebuilds and modifications, your VIN, and your own motorcycle's photo on the cover. The book stops describing the bike that left the factory and starts describing the one in your garage.