This has probably been covered here but I have a bad migraine and struggling to even read.
I recently had a very similar problem with a Victa Utility 2 stroke I was recently given though it would start hot it just wouldn't rev.
It turns out the plastic carburettor cover was turned away from the level mark meaning once it warmed up the float wasn't allowing enough fuel in to rev. I had no idea of the level mark on the white carburettor cover because my primary mower is a much older hand wind start (so much easier than pulling the cord (but I'm having trouble after replacing the spring on it the other day, (I'll get to it but not today) Victa Mayfair with the metal carby which is so simple.
Though friends own a local mower shop and were quick to point out the problem from a photograph I took and they really are a simple carburettor until you lose the needle in 4 inches of grass.
New needle, new white cover with new primer and new o'ring are sitting in my kitchen (don't ask, I won't lose it in there).
I was shocked though when the owner explained how to set the float height by adjusting the brass insert where the needle goes, he'd given me another cover with good primer bulb but it was a cheap after market unit he found in his stock (and gave it to me free saying it was used but in good condition) but somehow I cracked the fuel plastic nipple inlet slipping the fuel line back on. His son gave me another new unit better quality yesterday and set the float level with a file on the plastic needle, they've changed.
When did brass needles disappear?
Yes, I'm feeling old!
