Hi guys - Bike is going in for a top end service in the next few days so will probably be fixed by that hopefully, but I was curious as to what might cause a problem I am having. Basically the bike will [EDIT] perhaps not drop a cylinder but as the bike does not vibrate when it happens, but the engine note changes and the power drops off for a second or two at times, mostly when going over rough road. But once it stops, the bike is fine, revs freely, power is good. I also revved the crap out of it in neutral and the exhaust is clear so there doesn't seem to be anything majorly wrong with the motor. Any ideas? I was thinking the obvious culprit would the sparkplugs or leads. Thanks for any help.