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BSA unit twin bore & stroke data |
ID |
Type |
Size, CC |
Bore, MM |
Bore, inches |
Stroke, MM |
Stroke, inches |
Rod, inches |
Rod, MM |
Rod ratio |
4K
P-speed |
1 | A50 | 499 | 65.5 | 2.579 | 74 | 2.913 | 6.000 | 152.4 | 2.059:1 | 8,239 |
2 | A65 | 654 | 75 | 2.953 |
3 | A70 | 751 | 85 | 3.346 | 1.793:1 | 7,173 |
4 | A65 stroker 1 | 742 | 84 | 3.307 | 1.814:1 | 7,257 |
5 | A65 stroker 2 | 786 | 89 | 3.504 | 5.875 | 149.2 |
1.676:1 | 6,849 |
6 | 6.362 | 161.6 |
1.816:1 | 6,849 |
7 | Big bore | 725 | 79 | 3.110 | 74 | 2.913 | 6.000 | 152.4 | 2.059:1 | 8,239 |
8 | Big bore & stroke 1 | 823 | 84 | 3.307 | 1.814:1 | 7,257 |
9 | Big bore & stroke 2 | 833 | 85 | 3.346 | 1.793:1 | 7,173 |
10 | Big bore & stroke 3 | 882 | 90 | 3.543 | 1.693:1 | 6,774 |
11 | A65 de-stroked | 499 | 75 | 2.953 | 56.5 | 2.224 | 2.697:1 | 10,791 |
12 | Bored & de-stroked | 499 | 79 | 3.110 | 50.9 | 2.004 | 2.994:1 | 11,976 |
“4K P-speed”: RPM at 4,000 feet per minute piston speed
ID:
1. A50 500cc unit construction
2. A65 650cc unit construction
3. A70 750cc unit construction
4. A65 stroked with A10 crankshaft
5. A65 stroked with Norton crankshaft, uses Norton rod
6. A65 stroked with Norton crankshaft, uses special MAP Triumph/Norton rod and special piston
(may not be possible without barrel spacer)
7. A65 SRM big bore (advertised as 750)
8. A65 SRM big bore stroked with A10 crankshaft (advertised as 840)
9. A65 SRM big bore stroked with billet crankshaft (advertised as 850)
10. A65 SRM big bore stroked with billet crankshaft (advertised as 900)
11. 500 racer: A65 bore, de-stroked
11. 500 racer: SRM big bore, de-stroked |
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