Remember that Japanese moped you had in the 1970s? It cost you, or your dad, maybe £200. If you still had it, and you’d looked after it, it would now be worth £10,000.

Classic-bike insurer Hagerty says high-end collectors are adding ’70s and ’80s Japanese motorcycles to their stable at a pace. In 2018 they made up around 24 per cent of bikes in a UK-based collection of five or more vehicles. And it’s remained stable now, even given the commercial down-pressure of Covid.

Over in the US, Japanese bikes have been drawing the strongest buyer interest of any genre at the huge Mecum Las Vegas Motorcycle Auction; last year, average prices increased to $7,000, up 17 per cent since 2018.

Yamaha FS1-E from a 1976 sales brochure
Yamaha FS1-E from a 1976 sales brochure © Courtesy of the Yamaha FS1-E Owners Club

The driving force in the UK is nostalgia-fuelled forty- and fiftysomethings: “People who had, or wanted, a Japanese motorcycle in their teens are rediscovering and buying the bikes they or their envied friends owned,” says Mark Bryan of H&H Classics, which has an auction on 28 April at the National Motorcycle Museum. “To some, ‘classic’ means an early-’70s bike that is almost entirely metal,” he adds. “For others it’s a late ’70s or early ’80s plastic model.”

Ben Davis, 55, an engineer from Towcester, has an ’80s Suzuki PE400. “I spent my youth envying guys who had bikes I couldn’t afford. A boy who lived nearby had a Suzuki PE175 – off-road, purposeful, very yellow. When I bought one recently I got even by making sure it was the most powerful version.” He laughs: “Most blokes will cite envy and reminiscence when they buy a ’70s or ’80s bike.”

1989 Suzuki 498cc RG500 Gamma, sold for £13,800 at Bonhams
1989 Suzuki 498cc RG500 Gamma, sold for £13,800 at Bonhams

The rugged off-road PE had acres of plastic. But some of the hottest bikes on the market are the compact and streamlined 1980s (and even early-’90s) race-bike-related superbikes with plastic bodywork: Suzuki’s RG500 and GSX-R750F, Honda’s VFR750R RC30, Kawasaki’s ZXR-750R and Yamaha’s FZR750R, all upwards of £15,000.

In the UK, mopeds are also in huge demand. So if at 16 you were lucky enough to have a Yamaha FS1-E “Fizzy” or Honda SS50, you’d be a lot luckier now if you still had it. Back then, the next step was a Japanese 250. Or, if you couldn’t afford it, a 125. At least it wasn’t a 50. Engine size aside, none of them were recalcitrant, oil-spewing lumps of British engineering hewn from melted-down tanks and steam engines. Yamaha RD250s, Suzuki GT250s and Kawasaki KH250s were reliable, stylish, fast – and inexpensive.

Yamaha FS1-ED from a 1975 sales brochure
Yamaha FS1-ED from a 1975 sales brochure © Courtesy of the Yamaha FS1-E Owners Club

But the equation involving “fast” and “inexpensive” often equals “disposable”. Many were thrashed and fell apart. Many models are extinct. Expect to pay £5,000 to £6,000 for surviving, well-maintained versions of that trio, while entry prices for a pre-1980 Yamaha DT250 or an early-1970s Honda CB350 needing work are around £2,000. But budget £23,000 for a beautifully restored, highly desirable Kawasaki 900 Z1.

“We just sold a 1981 Honda CBX1000 for £23,500,” says Frank Hayes of Steel City Classics in Sheffield. “That was a bit on the low side. Other bikes worth considering from an investment perspective include Yamaha RD350s, which are making increasingly good money – between £4,000 and £12,000.”

1970s Kawasaki Z1B, £19,999, from Steel City Classics
1970s Kawasaki Z1B, £19,999, from Steel City Classics

For those buying their first Japanese classic, Richard Proudman of the Vintage Japanese Motorcycle Club suggests investing in the best example possible, and taking along someone who knows their stuff, including the availability of spare parts, which can drive up costs.

The smaller pre-plastic bikes, which made it beyond the handful of years when abuse and tinworm took their toll, are still amassing value, and are good market-entry bets, says Ben Walker, motorcycles specialist at Bonhams, which runs the big Spring Sale at Staffordshire County Showground, pushed back this year to 3-4 July. “This includes ‘trail’ bikes. Designed for light off-road use, they took off in North America in 1969, and the UK in the early ’70s, and are much sought-after.”

Late-70s Yamaha DT250, £4,499, from Steel City Classics
Late-70s Yamaha DT250, £4,499, from Steel City Classics

He advises looking for bikes originally supplied by a UK dealer. “There’s a premium on UK bikes, more so if they’re original, with full history.” Some buyers “prefer the patina of a machine with stories to tell, and to ride them; others the perfection of a machine they’ll happily look at for hours.”

“Trailies are great fun and mean you can venture to places a road bike can’t,” adds Mark Redfern of importer Somerset Classic Motorcycles. “The US is the go-to source. Though many US bikes were exported back to Japan, where there’s a ready market, there are still trail bikes – ‘enduros’ in the US – to be found there.” He currently has several trail bikes for sale, including a mainly metal 1974 Yamaha DT250 at £3,495 and a largely plastic 1979 Honda XL500 at £3,595.

1979 Honda XL500, £3,595, from Somerset Classic Motorcycles
1979 Honda XL500, £3,595, from Somerset Classic Motorcycles

Such was the impact of the first trail bikes that the Society of Automotive Engineers of Japan named the 1968 DT-1 250 a “Landmark of Japanese Automotive Technology”. “Find one if you can,” challenges Redfern. “Regardless, importing bikes involves a weeks-long process to get them UK registered. Dealers often complete the process during the time it takes to ship one here, and will deal with import duties and suchlike. But… owning and using a Japanese classic is immensely rewarding. Go time travel.” 

Where to buy 

Bonhams bonhams.com. H&H Classics 01925-210 035; handh.co.uk. Somerset Classic Motorcycles 01823-762 261; somersetclassicmotorcycles.co.uk. Steel City Classics 0114-252 5400; steelcityclassics.co.uk

Where to find out more

Hagerty 0333-323 1138; hagerty.co.uk. Importing classic bikes gov.uk/importing-vehicles-into-the-uk. Vintage Japanese Motorcycle Club 01454-501 310; vjmc.com. Yamaha FS1-E Owners Club fs1eoc.co.uk

Where to see 

Sammy Miller Museum Bashley Cross Road, New Milton, Hampshire, BH25 5SZ (01425-620 777; sammymiller.co.uk)

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