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Originally Posted by steveg
Problem was that one of the plugs had gone down & was only running on 1 cyclinder...............
.........I have since heard of another 2 plug fails on new SV 's maybe a duff batch of plugs?
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Err....just a little warning note: one plug "failing": possible. A whole batch....very, very unlikely (although not unheard of). The problem is that when some (stress, SOME) mechanics replace a spark plug, and the problem then goes, they report a "duff" spark plug. Unfortunately, they then rarely search out the cause of why the plug "failed" - or probably more accurately, fouled.
The MOST common causes of this are: engine run very slowly for extended periods (not uncommon during run-in); too much fuel (perhaps caused by use of choke and enthusiastic throttle pumping); insufficient available voltage to put a spark across the plug gap (sometimes a faulty ignition system, most commonly the plug shorted out by water around the leads,caps etc etc).
What this all means is that it MIGHT just hapen again if they haven't fixed the cause. You might consider, if you do a lot of short journies at rather slow speeds, a switch to Iridium plugs. They are more tolerant.