all really good comments for sure . i found they really are a tough engine too , had one last week told me got slower lost power then stopped , as usual it was checked and maintained perfectly wink .
so in front of the customer i checked the engine oil . stick was dry as uuum . it seized ! but when it got to me was free again so i topped up the oil didnt take much , only 550cc !!! and away it went and that was a year ago , serviced it twice since and only issues were as always the carby thing on them .
this type has the main jet similar to a quantum BUT at the top of thread is a small really tiny hole often missed its so small and when blocked it wont prime or will start and stall .
just a tip on that one smile .

cheers ,Dave