IL4 - THE COLLECTION
GEARHEAD · IL-4
Five drops. One engine.
The inline-4 story told in chapters.
TEST LOG
The engine before it was understood. Development annotations on a casting being figured out in real time.
REV TRACE
The specification. Bore, stroke, valve timing, peak RPM — the complete envelope locked in print.
FIRST FIRE
January 1969. The CB750 enters the world. The breakthrough that split the timeline.
THE PROVING GROUND
Broken. Understood. Rebuilt. Competition development from 1970 to the present. Status: ongoing.
LAST OF THE SCREAMERS
The naturally aspirated inline-4 is being replaced. This drop documents what's being lost.
COMPLETE THE SET
2 OF 5 DROPS LIVE
Five chapters. One engine. Collect them all.
LIVE NOW
DROP 01 + DROP 02
COMING SOON
THREE MORE CHAPTERS
First Fire. The Proving Ground. Last of the Screamers. Three chapters still in development.Sign up on each one to know first.
MORE WORLDS IN DEVELOPMENT