In the early 1970s, Honda had a dilemma. Offhighway bikes were selling like cold beer in July, and the sweet spot in the market was the quarterliter class. Yet Honda could only offer their CB100-derived SL125 or the SL350, also based on a street bike (the CB350). What to do?
A fresh start was required, and Honda came up with a groundbreaking design that defined dual-sport bikes for at least a decade, anticipating as it did the demise of 2-stroke trailies.
True to the company’s heritage, Honda stuck with a 4-stroke engine, in spite of the dominance of 2-strokes in the popular 250cc enduro/trail category from Suzuki, Kawasaki, Yamaha, Can-Am, Ossa, Bultaco and Montesa. To compete, Honda created the first massproduced overhead-cam, 4-valve motorcycle engine.
The compact and over-square 248cc…