I'd rather buy a new blower. If it lasted me five years and the engine needs to be pulled off, probably cheaper to buy a new one on the long run.
That is fine but down here they are 2 to 3 time the USA price and generally not a stocked item.
The oil sels on the crank need replacing every few years or they start leaking oil, very messy if on your back.
You also need to remove the motor to clean the space between the motor & the impellar housing and when cleaning the cooling fins or all the crap ends up between the motor & the impellar housing.
I rebuild a few every season.
Piston & ring replacement goes about $ 200 a lot cheaper than a new blower, even if it only ends up as the occasional use spare.