On 180 mile round trip ride today noticed that while passing a car in 5th gear, the motorcycle began to lurch like it was out of fuel then the problem went away. Arrived at Holt BMW to get a new set of tires. Marty the mechanic noticed the same thing on a test drive but only in 5th gear. On the way home I tested the GS several times in 5th gear and each time when I applied throttle it bucked, lurched and acted like it did not have fuel. I tested it in all gears and it runs and accelerates normally so the problem appears to only exist in 5th gear. Has anyone heard of a problem like this, if so what was the fix.