The rear sprockets on my 750 SPR are alloy...all 3 choices. I purchased an OEM alternate rear sprocket for my 910R in a sale once, not realizing it was for a 750 and would not work. That sprocket was also alloy. (later sold at for a great price to another forum member).The OEM sprockets on a 750s are steel, not alloy.
Spiros;I would tend to lean towards Silentservice 703's advice, Chain pitch. Then check what Noel said about alignment..
I agree with you but PFG might of given him a wrong sprocket to suit his chain. I meant the width. i will edit now.Thanks Noel. Anyway im sure he will sort it out.Spiros;
the pitch is all the same 1/2", only the width changes 1/4"-5/16" (520-525)
you can run 525 on 520 sprockets, but not the other way around
"expertly matched to my bike" by PFG might be a problem,
given their past issues:stickpoke
misaligned sprockets on new chain is the worst :jsm: