I just broke 4000kms on it today but I think I've killed it. I've got a horrible knocking sound coming from where the cylinder meets the case. I thought at first it was the head, but after adjusting the valves twice and putting my stock exhaust on it, the sound is definitely coming from the crank area. The engine still runs good but that knocking sound is getting loud. I'm going to try to re-tighten the head to see if it's just a leaking head gasket, if that doesn't work, I guess I'll pull the head and see if a circlip has come off. This sucks! I guess the commute over the bridge wasn't good....