Weight, then rotational...all the physics. Instead of the 525 or 530 with it's heavier weigt and strength you give up the strength for less weight...but you can stretch and even break a 520. Chains like on the Harley and clones are now being replaced with Belt drives. You get less Chain slap when there is slack in a chain, so if you are running a heavy chain and you let off, and ther eis some serious slack in in then there is some SLAP to it which you can feel...even with a 520 if it's not set right. In the real old days...never-mind..you'd have to talk to "Uncle Bob", (This should get him laughing), Even car engines have internal timing belts that are now not chains. The first Honda car that I ever saw in the US had a chain drive from the engine to the rear end...I saw the car in Oahu, Hawaii on Hickam Air Force base in 1973, and I don't remember the year of the car.
Now if we could only get some narrow light-weight seriously strong, non-slipping belts on our Kawasaki's....
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