| Also known as | E6884 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 11 |
| Subsystem | engine bottom |
| Listed in parts books | 1967–1970, 1974 |
PISTON COMPLETE C.R. 9.75:1 T100R, T100T
Complete 9.75:1 compression piston for the Triumph 500 twin, listed for T100R and T100T.
This is a complete piston for the Triumph 500 twin, listed in the parts book as a 9.75:1 compression ratio piston for the T100R and T100T. It's cataloged under the crankshaft and connecting rods section, since the piston is what the rod bears against inside the barrel, converting the burn in the combustion chamber into the downward stroke that turns the crank.
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The older alias for this part is E6884, so if your parts book or an old parts bag has that number on it, it's the same physical piston as 70-6884. The catalog shows this piston appearing across rows spanning 1967 through 1974, which tells you it had a long production run in the parts system, but pin down your actual compression ratio and bore size before ordering since pistons for this engine family came in more than one spec.
When you're replacing a piston you're also looking at rings, gudgeon pin, and circlips as a matched job, and it's worth checking your cylinder bore for wear before fitting a new one. Give us a call with your engine number if you're not sure which piston spec is correct for your machine.
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