Restored to a high standard by the vendor who acquired the bike in 2018
A desirable model that was used extensively by the Armed Forces, RAC and AA in period
Offered in running order, selecting gears easily and braking effectively
The Appeal
Proving rugged and reliable from the outset, the BSA M20 and M21 were favoured by the British Armed Forces for three decades. Outside the military, these motorcycles were often paired with sidecars to provide roadside assistance with the AA and RAC, and some were even tuned for speed trials - a versatile machine indeed.
The vendor acquired this 1959 M21 in 2018 from Andy Tiernan Classics Ltd for £3,400 and has since carried out an extensive restoration which amounted to a further £3,000 in expenditure. The bike is something of an M20/M21 hybrid, as its original 600 cc engine was changed at some point in its life for the M20’s earlier 500 cc unit. The restoration work was carried out to a high standard and since completion in 2020, the bike has been briefly ridden to determine everything functions correctly.
The History and Paperwork
Invoices present for some of the outsourced restoration jobs
Acquired by the vendor in August 2018 from Andy Tiernan Classics Ltd. for £3,400
The vendor has spent a further £3,000 on the restoration which was completed in early 2020
Stored in a dry workshop since it was acquired by the vendor
The original M21 engine was 600 cc and this bike has had the M20 500 cc engine installed at some point during its life
The Condition
All painted parts have been restored/repainted to a high standard
All chrome items have been renewed, sourced from Dragonfly Motorcycles, Bungay
The fuel tank has had all dents removed before re-chroming
The fuel tank is reportedly free from internal corrosion
We’re not informed of any damage or corrosion to the frame
The seat upholstery and various rubber components present very well
Both wheels present impeccably
Smart badging and decals
The speedometer/odometer unit presents very well
The Mechanics
500 cc four-stroke side-valve single engine
Four-speed manual gearbox
Pre-unit construction
No corrosion or damage apparent to the engine casings and exhaust
The engine cylinder and piston where checked during the restoration and found to be in good condition so no engine rebuild was required
The engine oil pump reportedly works well with good return to the oil tank
The bike was ridden post-restoration and reportedly ran and rode well
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1959 BSA M21
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