What should the max RPM be on this sled? Mine runs up to 8350, but seems like it backs off for the last couple hundred RPM. Also curious to know if the backfiring is normal? It doesn't do it all the time, just after bit of hard riding and sometimes when I shut it off. Nothing is on fire...

anyone else notice rough engine at low rpm on deceleration slow acceleration in the 4500 to 4900 rpm range? This is problematic in tight trails in woods especially.