Anyone with Engine knowledge

[Gripper]

Me mother in law got a Briggs and Stratton lawnmower,and the sister in law turned it upside down,that did a good job of feckin it up for a bit,got it fixed and it runs sweet now

[Jon L. Obscene]

Turning an engine upside down will not do it much good, especially a 4-stroke as the valves and rocker housing will fill with oil and take a long time to drain back into the chamber.
Even a 2-stroke will fill the piston with oil making it near impossible for the fuel to ignite.
Can also blow the oil ring on the piston, if that happens you can end up with piston score which could possibly lead to crank warpage.

2-stroke engines are generally a piece of piss to work on and fix, but they do constantly go wrong due to the simple parts and workings, they are also not as hard wearing as 4-stroke, I'd never have another 2-stroke bike again
The last one I had I ended up throwing on the beach in temper

Suzi GP100

Jonno

[Virtualbody1234]

Yeah. You can't kill those 4 stroke Briggs & Statton engines.

[BigDaddy555]

its probably a short in the flux capacitor

[Virtualbody1234]

its probably a short in the flux capacitor

1.21 jigawatts needed.