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Old 02-01-2012, 05:46 AM   #62
Fire Escape
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Joined: Apr 2007
Location: Epsom, NH
Oddometer: 1,541
Spacer?

You could probably get by without changing anything, perhaps not elegant but functional. The second (and third?) digit of chain size is chain width*, originally in 1/8s. 530 is 3/8" wide, 520 is 1/4", 525 fits in the middle at 5/16". If you wanted to line it up precisely you would add 1/2 of the difference, 1/32" (0.031") as a spacer inside the sprocket. That, assuming that the factory got the engine, chassis & swingarm put together that closely. I will predict that your chain will never know you changed sprocket width.
* Disclaimer: I have no idea what the 8 in 428 chain size means!
Good luck.

Bruce
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