The later twin carburettor A65 Lightning naturally comes with all the refinements on the Thunderbolt. Although having the same 9:1 compression ratio, twin Concentrics upped power to a questionable 55bhp.
BSA claimed a more realistic 44bhp for the single carburettor Thunderbolt. Cycle blasted their Lightning up to 108mph and were impressed with the brakes and easy starting. The Firebird Scrambler is a street version of BSA's off road 650 Hornet.
It was first built in 1967 without a lighting set and with the pre-unit Gold Star's 190mm front brake - also fitted to the Spitfire at the time.
By 1969 a steel petrol tank based on the 250 Starfire model replaced a glassfibre type and the exhaust system exited together at high level along the drive side - its centre section covered by a wire heat shield. You are unlikely to find a Firebird Scrambler in Britain unless you have good contacts.
The Firebird Scrambler - a street version of the off road Hornet. First made in 1967, this 1968 model has a high level exhaust sytem.
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