I'm a 68 (69 this month) years old rider. When I retired in 2003 I sold my 1975, 750K Honda, after owning it for almost 28 years. I had other cycles before and during the 750 years, but enjoyed it the most. Just recently, I was bitten once again by the riding bug and purchased a used 2000 (MM Limited Edition) Yamaha RoadStar, #0294 of 1500 manufactured. I found a 2006 transmission recall notice online and had that done. During the recall repair, the mechanic found a carburetor leak and a cracked intake manifold. These were repaired during the transmission teardown. Now for my question to any other owners of similiar cycles: During fullbore acceleration in the lower gears, when I reach certain RPMs or MPHs, the engine loses power, and starts backfiring and sputtering. If I shift into the next higher gear the problem goes away until I reach the next RPM/MPH "GOVERNOR" point. I have no problem with normal acceleration takeoffs, highway cruizing, etc. The recall mechanic advised that the large 1602cc Yamaha had "rev limiters" factory installed. Do other owners' experience this situation? This cycle does have an aftermarket air intake/filter holder installed. I am also interested in other owners/riders opinion of this particular series of Yamaha motorcycles. Does anyone know how many of the 1000 in USA of 1500 manufactured are still on the road?