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The aim of this put up is to take a look at the engine specs, or the state of tune, for the assorted Huntmaster fashions and see how they examine with the closest BSA A10 fashions. We’ll determine which A10 is equal to the Huntmaster.
Listed here are the areas into consideration and the information I’ve discovered from reviewing the books:
Compression
- 6.5:1 GF & Huntmasters 1954-1959
- 7.25:1 Optionally available for Huntmasters 1954-1959, normal for Cyclones
- 8:1 RR, Optionally available for Cyclones
- 8.3:1 SR
- 9:1 RGS
Camshaft
- 334 “normal” – fitted to the Golden Flash from 1950 – 1959.& Huntmasters 1954-1959
- 356 “sports activities” – Fitted to the Street Rocket, to the Tremendous Rocket till 1959 and The Golden Flash from 1960. & Cyclone
- 357 “race” – Fitted to the Tremendous Flash, Spitfire Scrambler and Rocket Gold Star. Additionally fitted to the Tremendous Rocket from 1960.
- 358 “acceleration”.
Valves
- Inlet 1.406 Huntmaster 1954 -1959, gf1950-1957,sf/r1953-1960
- Exhaust 1.375 Huntmaster 1954 -1959 gf1950-1957
- Exhaust 1.381 sf/r1953-1960
No head adjustments for Cyclone
Carburetters
- 76/276 (1 1/16″ bore) – Inflexible and plunger framed Golden Flash, additionally swinging arm Golden Flash & Huntmasters in 1954.
- 10TT9 (1 1/16″ bore) – Tremendous Flash and Street Rocket, additionally Tremendous Rocket till 1961.
- 376 Monobloc (1 1/16″ bore) – Golden flash swinging arm body, Huntmasters 1955 to 1959 and Spitfire Scrambler (1956 – 1959).
- 389 Monobloc (1 1/8″ bore) – Golden flash 1960 on.
- 389 Monobloc (1 5/32″ bore) – Spitfire Scrambler (1960 on), Tremendous Rocket (1962 on) and Rocket Gold Star.
No carburetter adjustments for Cyclone
Conclusion
So there you could have it:
- A regular Huntmaster is equal to a BSA Gold Flash, probably the most primary A10
- A Cyclone is near a BSA Street Rocket, although with a barely decrease compression ration except it’s fitted with the non-compulsory 8:1 pistons
- My bike shall be equal to an ordinary specification Ariel Cyclone.
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