Hi i guess this may be running to rich i'm not sure... but i have just run in an RBWS7II and while racing today i noticed after i put in the ARO that the plug was sooty & the top of the piston looks the same could this be simply running too rich, it was however running (imo) a bit hot earlier so i did richen it a bit as i was worried prolonged use racing today may have damaged the liner & piston, but can it damage it also if running a little rich for too long, not sure if it's the top or bottom end needle which is wrong, but i need another opinion as this was not a cheap engine to purchase,i am using Tornado 25% with a no.8 o.s plug

oh btw UBERCHAVALEX NEED NOT REPLY TO THIS POST AS I FIND HIM OFFENSIVE & HIS ADVICE USELESS !

Thanks in advance people