Honda's two-stroke motocross racers, from 80cc minis to the CR500R, built until 2007.
1974 – 2007 · 125cc · 2-stroke
Aluminum twin-spar frame from 1998 (Honda timeline). Later revisions around 2000, 2002 and 2005 were not dated by any fetched source.
Boundaries are sourced (liquid cooling and Pro-Link 1981; aluminum frame 1998), but this span held several redesigns whose years no fetched source dated; an editor may split it.
1973 – 2007 · 249cc · 2-stroke
New case-reed engine with electronically controlled exhaust valve in a third-generation aluminum frame.
1984 – 2001 · 491cc · 2-stroke
New water-cooled engine for 1985; Wikipedia says the final models were nearly identical to the 1993 bike.
1980 – 2007 · 83cc · 2-stroke
Redesigned in 1996; handling refined 1999.
1996 – 2007 · 85cc · 2-stroke
All-new air-cooled CR125R.
Air-cooled twin-shock Elsinore; 1978 got more travel and red fork sliders.
Second-generation, more compliant aluminum frame.
First twin-beam aluminum frame and heavily revised engine.
New, more powerful engine in a steel frame first criticised as too weak; gusseted frame from 1994.
Major 1984 redesign with ATAC exhaust valve and front disc; later updates added a cartridge fork (1986), rear disc (1987) and inverted Showa fork (1989).
First liquid-cooled, single-shock Pro-Link CR250R; 1982–83 revisions fixed its reliability problems.
Air-cooled twin-shock era after the rename from CR250M Elsinore; 1980 brought a center exhaust port and double-downtube frame.
First-year CR500R.
Liquid-cooled from 1983; 1985 new frame and engine, 1986 revisions. Internal redesign years not all dated.
Air-cooled; scaled-down Pro-Link added 1982.
Only if cr80rb merges in.