First 12,000 miles (2 years) - - No problems. Last 6 months have more than made up for that.
Started slipping/popping in second gear while under moderate acceleration. Within a couple months, second gear broke loose and punched a hole in the engine casing three days before warranty expired. Casing replaced and 2008 upgrade kit installed. Three months in the shop.
3 days after getting the bike back, second gear completely failed to mesh at all. Took it back for rework. Dealer claimed Triumph sent them the wrong second gear in the upgrade kit. Triumph disputes this claim. Second gear replaced and picked up the bike 2 months later.
Went to pickup the bike and the radiator was leaking coolant. Didn't even leave the dealer. Stayed in the shop for another week. Leaking radiator hose or loose hose clamp.
Within 2 days of getting the bike bike back, the second gear popping issue is back again - - even under very light acceleration. Back to the dealer yesterday. Triumph will continue the good will work, but insists that the engine be torn down to investigate what they believe is simply an adjustment issue. Dealer's story and the warranty repair order at Triumph HQ do not match.
And so we wait again. Triumph does not consider this to be a lemon law issue. A court will have to decide that.
I believe this is a fixable problem. My dealer just can't get it right.