In hear that 50hr valve spring change will freshen these motors up. What other recommedations are out there for the 50 hr interval.

If it aint broke don't fix it!!!!!!!!!

Seriously, I have 140 hrs on my 500efi and only clean the air filter and change the oil. Actually I need to clean the fuel filter??? do that this weekend.

I was told by Fountain that the 500efi, if babied and proper maint. should have at least 1000 hrs with no problems????

ditto - Mine have 120 hrs.