This new production Triumph 500 cylinder barrel is suitable fitment for the 1958- 1974 unit-construction Triumph 500 twin-cylinder models with 69mm pistons. Not suitable for the pre-unit models with 63mm pistons.
The cast iron cylinder barrel is finished on standard bore and manufactured in the UK by Aerco. Supplied with a gloss black finish. May require finish honing prior to fitment of the pistons.
When the cylinder overbore reaches .060″ and symptoms such as a loss of compression, heavy oil consumption, and smoking exhaust are present, a cylinder barrel is often deemed to be at the end of its service life. A new cylinder barrel is fitted to restore original performance, along with new standard-bore pistons and rings.
The top end of the engine from the cylinder base up must be removed for Triumph 500 cylinder barrel replacement. This procedure is outlined in the factory workshop manual but may best left to a specialist to carry out the top-end overhaul.
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