my new projects (sorry little late in posting) little help on a few bits ?

hi just fell in luck went round a mates to get 2 tyres fitted and the said he was clearing out his garden of the metal bits said he had been keeping it to long and the scrap value hit rock bottem and not worth him driving around to get rid or do any thing with them

i got one small petrol generator 4 stroke
and 2 petrol lawn mowers both i think very old 1970s ? and 80s poss im sure there is some one out there better know what they are

generatoer pull cord not working properly sorted ok fuel in it very old and smells tank washed out cleaned the carb (carb cleaner and air tool clean) cleaned air filter and oiled starts quick runs but some times cuts out power is produced great when running running a halagen light

the old blue one not had much off a look but no spark and took me 10 mins to find how to start it with as its got no pull cord and you just twist the top and push a lever to turn the engine over

the red one has spark but little oil and again petrol smells so that will need a clean and oil before any testing can be done (not got any farther on the two mower as the gen is more helpfull to me so started on that first

and they have not cost me anything but will split any thing i get if i can get any of them running proper less parts oil and such with my mate so hope theres a few beers there with luck already put in and hour and a half on the gen to get where i am now

so any help on why the gen starts and runs but then stop

my new projects (sorry little late in posting) little help on a few bits ?