Gotta be a trick here ... engine overheating? ... poor acceleration? ... Lack of a air filter allowing dust into the engine?? Poor performance during extremely cold weather?? ... The obvious extreme safety issues with his "Hillbilly" setup ...
Of course this only works on a normally aspirated engine. WHO has any of those anymore?
The manufacturers make tradeoffs to sell lawnmowers.
Long runtime may not be one of them.
If it does work, is it worth it in the grand scheme of things?
If the lawnmower makers view this as a serious threat to their business they may buy you out. If that doesn't work they will send thugs. Or they may patent it and then accuse the original inventor of infringing on their patent, because, after all, here in the US we are civilized!
I was waiting for it to burst into flames. Would have made a great video.
Of course, you never get a follow-up and things like this. How is it working two weeks later?
Reminds of the hillbilly who used a live .22 cartridge to replace a fuse under his dash.......didn't turn out well.