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"Hi Bill, thanks for the order via our website. We are currently back ordered on the 17 tooth without an ETA. I will refund you the cost of the 17 and ship the 16 today. Sorry we are backordered, check with us in 6-8 weeks on the 17 tooth status."
That is correct. If you try t to use a O-ring chain it will hit on the engine case. I use a non O-ring and mount the sprocket (16T) to the inside. The rear 520 sprocket does not have the thick flange.
As I ordered an O-ring chain will I need to do anything to the rear sprocket other than change to the 520 pitch sprocket or will it give me that much misalignment and still work okay?
If you can find a sprocket that's 530 base and 520 at the teeth you can run it offset to the outside then they will line up. 1/8" diff in width 520-530
17 TOOTH 3/8" (9.5MM) OFFSET SPROCKET FOR XS650
$69.00
Cognito Moto designed 3/8" (9.5mm) Offset Sprocket for XS650.
Made from Chromoly steel and case hardened for durability. Provides 3/8" (9.5mm) of offset for the front sprocket. This will generally allow for wider rear tires (up to 160 wide tire).
17 tooth (Like stock sprocket)
3/8" (9.5mm) offset
Made from Chomoly steel
Hardened for durability
Added length to spine for added support
For 530 chain.
Fits:1970-1983 XS650