[Old Fart]

Replacement intervals are a conundrum. Hell, on a car the belts can can go 10 years or 150,000 miles.

On the 2V engines the two year cycle is pretty much on target. This is predicated on the wear induced by the small diameter idler rollers that flex the hell out of the belts. And the generally small drive sprockets that all ducs use.

Now on the later 4V engines such as the testastrettas the idler diameters are huge in comparison. This fatigues the belts less therefore a longer service interval could be derived. I don't think there will be a revised recommendation to increase the duration for two reasons. A. The factory probably doesn't collect data based on long term test to failure criteria. B. They make a lot of money selling belts.

I dunno, I'm sure I could stretch the interval but call me chicken or whatever, I'll still feed it a set of these outlandishly priced belts every two years. Still trying to think of what to do with all the old belts I have laying around. Lessee,, 2002 bike every two years x 2 belts = 8 used belts hanging on a hook in the basement.

I also have an older Goldwing. These belts are like $60 each from Honda. But the bike has been running fine for 15 years on Toyota Corolla belts (Gates) from NAPA at $13 each. I stick a set in every five years or whenever I think of it. Go figure.