I'm curious how your problem has evolved.
I've been dealing with similar starting issues on my emax 25.
Dealer has looked at it several times and can't pin it down, other than they think it is a fuel problem.
It's randomly not started for quite a while now, even managed to do it while they had it.
Got it back yesterday, started fine.
Today it started right up, but while I was using it it just stopped, no sputtering or anything just stopped, like you had reach up and turned the key off.
After about 10 minutes it started again, used it for maybe 20 and it stopped again. Won't start.
Will be having the dealer come get it. Again.
Already had to have the muffler replaced due to it breaking completely off at a weld. New muffler has additional brackets. At least that was covered by warranty.
Replaced a hydraulic hose because it was draped across the pulley on the belly mower, cut right through it. I re-routed the replacement so that can't happen again, I paid for that out of pocket.
Edit: Went out after reading thru these, ran the 10amp fuse that is in a separate holder in and out a few times, moved the wires around and it started right up. No idea if that is the issue, since it very well might have started tomorrow like nothing had happened.
Still don't know why it just stopped running on me twice though, lucky for me I was in the yard and not on the side of the road!