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RAF,
If you take care to warm the engine before using it hard, do regular oil changes etc, there is no reason these mildly tuned engines should not run to 100K plus miles.
OTHH, if you regularly red-line it from a cold start, skip maintenance and generally abuse it, then you'll drastically shorten its life.
'Bike' magazine in the UK ran an article on a Triumph triple (Trident) which was used by the German magazine 'MO' for 100K Kms (60K miles). It was stripped down back at the Triumph factory and was still in almost new condition with very little wear. Biggest problem I think (now re-designed I believe) was 3 x failures of the sprag clutch in the starter.
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