I use 420 on my R6 and saved 3.3lbs over a 520 chain. I used #41 industrial steel front sprockets which seem to fit 420 chain just fine. I have 14 tooth front and 65 rear. I had to get a custom rear made by sprocket specialists. Im putting 30-35kW thru it at the moment with no issues.
I can also get you a link to a 420 oring chain if you want that. I used 154 links I think
Sent from my SCH-I605 using Tapatalk