I guess also, the bike doesn't seem to be running lean and I don't detect any detonation. This happened on a hard WOT run to find top speed.Still good to know not to use them! Some sh*t metal I guess?
This was the longest run at full throttle I've done on this bike, at least 30 seconds. It has a 2 degree ignition advance over stock, K&N pod filters and slip-on mufflers so now that you've pointed that out I'm getting worried it ran lean. Current main jets are Dynojet 128, think I'll order a set of 130s. From www.jetsrus.com that'll cost $30.The second plug looks like a lot of the ground is gone.