I'd bet the SV400 uses a lightweight chain, like a 418? (not sure of the spec) not the heavier 525 chain the SV650 uses, so the SV400 may be more tolerant of the 14 tooth c/s sprocket. Rich -----Original Message----- From: Jim Stewart [mailto:js at strappe.com] Well, Zoran tells us that the SV 400 has a 14 tooth sprocket stock.