Which Daytona model and year is it? How many miles on the engine, and on the last oil change? What type and grade of oil? How was it broken in?
The bike is a 2002 Triumph Daytona 955i. (3 cylinder).
Unfortunately I don't know a whole lot about the engine as I bought it used off ebay. The mileage on it is about 15,000 and I see where you are going. When I recieved the motor, the first thing I did was to inspect whatever oil was left in the motor and filter. All appeared normal. I use 10w40 Mobil 1 and there was only about 400 miles on the oil change since this happened. The bike is not down on power as I can compare it to my brother's who has the same bike. There is no blue smoke (or black) at any time as I would suspect with bad rings or too rich a condition.
On a few occasions the bike would seem to run on two cylinders (only for a few seconds after starting) as I would feel a lurch when the 3rd came online. I attributed this to a faulty connector on the stick coil (one of them has a broken retaining tab) but I think I tie-wraped it. I never gave this much thought as the bike ran so well but apparently it warrants closer scrutiny.
I am going to inspect the airbox and hose routing today as and see if I can watch the injectors at work to see if one or more are stuck open.
Judging by how much oil came out I estimate about a quart of gas in the oil.
I want to see if there is any flooding in the air box and see if the plugged overflow hoses have anything in them. They should be clean as I just installed them. Also there is a servo system to introduce air into the TB's for starting purposes. I need to check that as well.
I will inspect the plugs too.
Another thing. I have no idea whether this happened while riding or while warming the bike up yesterday to change the oil. The bike had been sitting unridden for months but the gas was heavily Stabiled and idled for maybe 15 minutes.