BMW R90/6 Street Racer

Updating a classic motorcycle

Start

Envisioned end-state

A 1974 BMW R90/6 — 898cc boxer twin, original everything — being turned into a sharper street racer. The work is practical: subframe, front end, Brembo brakes, M-Unit electrical system, clip-ons, and rearsets. The point is to keep the airhead character while making the bike handle and stop better.

Chronology

Aug 2, 2025

Electrical planning with a wiring schematic

Aug 2, 2025

Gary riding the BMW R90/6 before the street racer build

Aug 14, 2025

Street racer parts and hardware laid out on a bench

Oct 24, 2025

Dec 27, 2025

BMW R90/6 raised on a jack during teardown

Jan 15, 2026

Rear section and seat mocked up on the BMW R90/6

Feb 3, 2026

Feb 3, 2026

Gary and his son in the garage with the motorcycle project

Mar 1, 2026

Front wheel hub disassembled for fitment work

Mar 4, 2026

Mar 4, 2026

Bearings, spacers, and small parts on a workbench

Mar 6, 2026

BMW R90/6 street racer build with front end and rear section coming together

Apr 3, 2026

Custom front axle being machined in a CNC lathe

Jun 6, 2026

BMW R90/6 street racer with two wheels installed in the workshop

Jun 22, 2026