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I have a '99 Sprint ST with the 955i engine and it has been doing about fair on the reliability front. At 31,000 miles a spark plug apperently disintergrated, taking the cylender head and #1 cylender with it as it died. As inconvenent as that failure was, I find it difficult to fault Triumph with the failure, as the plugs were NGK brand.



The bike has just over 49,000 miles on it and, aside from the above, has performed flawlessly. The regular service is fairly painless, and it's every bit as strong now as it was when it was new.
 
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