Glad the saw didn't start. Not cut but I have experienced the same when I didn't realize the decomp had closed.
Ron
The DeCo-valve can easily become the source of a botched starting process!
An operator that is used to an engaged DeCo will not expect the high resistance his saw can create in case the DeCo closed or didn't open in the first place.
The highest unexpected starting resistance I ever encountered was on my PS-6400.
I had blown it off with pressurized air at work and once back home attempted to start her to make sure everything is OK.
I nearly ripped my arm out of my shoulder, or so it felt!
The saw was hydro locked!
Blowing it off with about 6 bar (industrial) pressure must have pushed excess fuel from the carb into the cylinder - the saw was impossible to turn past TDC. I pulled the soaking wet plug, turned the engine over a few times and let it sit w/o the plug for a while to let it breathe.
After that the saw started, a bit unwilling and smoking like a crowd control smoke grenade, but it had the usual resistance again.
I did never encountered hydro lock till that moment, it was a painful experience.
I did a ground start when that happened, saw flat on the ground, right foot in the rear handle, right hand on front handle, left hand on the pull rope.
I think I would have rather preferred the pull rope ripping off instead of all that force ripping my joints!