| Also known as | GAN26 |
| Listed in parts books | Not catalogued by year yet |
PISTON SET +.040 (64mm) T100 1939-57 - 9-1 COMPRESSION - REPLACES 70-3615 CP161 - Use CP29 for 7:1
Piston set, +.040 over (64mm bore), 9:1 compression, for the pre-unit Tiger 100, replacing factory number 70-3615.
This is a piston set machined to +.040 over, giving a 64mm bore, for the pre-unit Tiger 100 engine covered in the 1939-57 catalog span. It's listed at 9:1 compression - if your engine calls for the milder 7:1 setup instead, the catalog points you to CP29 rather than this set.
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The part replaces the older factory number 70-3615 and shows up in supplier records as CP161, so if your parts book or an old invoice has either of those numbers on it, this is the same physical piston set. It also appears under the alias GAN26.
Because this is an oversize set for a rebore, get your actual cylinder measured before ordering - +.040 over needs to match what your bores were actually taken out to, not just what the engine displacement nameplate says.
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