I agree that quality drive components will outlast the cheap stuff regardless of size, but a 520 should outlast a 428 if they are the exact same grade of chain on the same motorcycle. The 520 has more material and surface area, it should wear a bit less. Some factors to consider in the 520 / 428 debate.
Weight: The 428 drive set should transfer horsepower better than the 520 because it's a bit lighter. However, high end 520 components such as aluminum sprockets with 520 racing chain, will be lighter and roll with less resistance than a heavy duty 428 chain on steel sprockets.
Price and availability: I think it's going to be easier for people to find certain combinations of drive components in 520 vs 428, but that will depend on what country you live in and the depth of aftermarket support.
Forchetto, you mentioned f650.com (a sight I frequent because I have a F650 Funduro) their chain FAQ is great,
http://faq.f650.com/FAQs/GeneralChainFAQ.htm along with the sprocket page you pointed out. We need to follow their example and report on what drive component combinations are best for our beloved QM/XF200.
We should try to figure out the speed/RPM variations of the different gear ratios and how they relate to the different wheel sizes of the motard and dualsport models.
For instance, I have the dualsport:
Setup #1 (Stock) 520 Chain 12T Front 36T Rear (Ratio 3.00)
Good for the dirt or 2 up riding, bad for long hauls on extended pavement.
Setup#2 520 Chain 14T Front 36T Rear (Ratio 2.57)
Good for extended highway use, bad for off road riding or heavy loads.
Top speed (by GPS) 114.25 KPH.
Setup#3 520 Chain 13T Front 37T Rear (Ratio 2.85)
Good all around combination. Helps with vibration at cruising speeds of 70-90 KPH, still has good performance in low gears when you go off road.
Top speed (by GPS) 111.40 KPH.
This spreadsheet
http://www.dropbears.com/u/utilities...earing_V12.zip would help if we could find the gear ratios for the transmission. Are these is the service manual for the DR200?
Anyone?
Cheers!
ChinaV
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