I've thought about the oiling issue but couldn't find anything wrong. As far as over revving it, i don't really know. On the first motor I've never held it on the rev limiter and I shift before the red light when ever i decide to have some fun. However with the other motors the warranty company kept getting, the second they started having problems and didn't want to do anything about it I did what ever it took to blow em up.
They all had preexisting problems from the start.
2nd motor lugged at 4800 rpm, and didn't sound the same (sounded like the cats where plugged but they weren't. 3rd motor the valves ticked. 4th motor had ticking valves and slight knock and lugged at 5000 rpms.