Idler sprocket

[Kid Thunder]

IDLER SPROCKET, 520 (G0600.1B7 RevA, IDLER SPROCKET, 520 (G0600.1B7 RevD or IDLER SPROCKET, 520 (G0600.1B7 Rev E.
Which one should I buy. I've seen a picture of 2 of them. One is smooth the other has flat teeth.
Thanks in advance!!

[EBRRider]

IDLER SPROCKET, 520 (G0600.1B7 RevA, IDLER SPROCKET, 520 (G0600.1B7 RevD or IDLER SPROCKET, 520 (G0600.1B7 Rev E.
Which one should I buy. I've seen a picture of 2 of them. One is smooth the other has flat teeth.
Thanks in advance!!

Go with the smooth one ,it should last longer. the ones with the teeth are for the RS racers. https://www.ebay.com/itm/Erik-Buell-EBR-Motorcycle-IDLER-SPROCKET-520-G0600-1B7-Rev-D/202234060146?hash=item2f1616dd72:g:tI0AAOSw9p9aiy7 R

[Kid Thunder]

Thanks!!