russdaddy said:i have a 1990 RM250,i was wondering if it is bebeficial,bad,or will make no difference if i use a iridium plug in it.
the plug number for the iridium plug is BR8EIX and the plug number on the regular NGK R plug is BR9ES.thanks
Well said.SpDyKen said:I have never fouled a plug in my YZ125's or 250's, in the last three years, including slow riding with my daughters, and other beginner riders.
Of course, I have read, and followed, the advice of almost every jetting thread I've been able to find here. Very good stuff.
I have replaced a plug, just so I would have a fresh one to look at, but I am learning to look more at the piston and cylinder head. I usually figure that the engineers and testing teams that design and finalize the settings on the bikes I buy, are smarter & more experienced than I am. So I usually buy the recommended spark plug.