You guys are arguing how many fairies you can fit on the head of a pin...
If it rattles, it's gonna die.
Doesn't matter if it is too much advance, not enough octane, too much compression, not enough squish area, or a thread stuck out from the plug hole.
I most definitely have heard that death rattle from too much timing advance.
I have never been inside the cylinder to see what happens, but old Harry Richardo used a glass plate to have a look inside and this is what he saw: the early spark caused an ever increasing pressure spike due to temps (Charles and Boyles law) that caused the spontaneous detonation of the remaining mixture once the pressure went over a certain limit. Call it what you will, results are pretty much the same.
So timing curves on a 2 stroke - usually pretty flat or even retarded at max revs.
Has to do with the pipe exponentially increasing pressures at powerband.
Usually the hotter the engine, the more retard at max revs.
The Blaster is pretty much a flat line over 2000rpm so a YZ125 will likely be safer on it if you can get the initial timing right.
