| Also known as | E6899 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 12 |
| Subsystem | engine bottom |
| Listed in parts books | 1967–1969 |
PISTON COMPLETE C.R. 9.5:1
Complete 9.5:1 compression-ratio piston, Triumph part 70-6899 (also listed as E6899).
This is a complete piston listed at 9.5:1 compression, catalogued under 70-6899 (also shown as E6899 in older books). It shows up in the crankshaft and connecting rods section of the parts books, which is where Triumph grouped piston listings alongside the bottom-end components they mate to.
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A catalog line naming a compression ratio like this is telling you the piston was specified for a particular engine build spec rather than being a generic replacement, so it pays to check what's stamped or measured on the piston currently in your engine before ordering off the ratio alone.
The catalog record spans a run of appearances from the late 1960s, but it doesn't spell out which specific model this piston was fitted to, so confirm bore size and compression against your engine before you order.
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