I have had my Ryobi bought new in 88,

[Linked Image from i313.photobucket.com]

Starts fine, always follow the steps
Full choke, pull starter till she pops
Half choke, starts and run for approx 10 secs
No check and running

I mix my fuel only a little at a time so just a bit is left in the tank, I use a quality 2 Stoke oil but mix it right. Only work I have done is to replace the clutch spring

[Linked Image from i313.photobucket.com]


[Linked Image from i313.photobucket.com]


I pulled the muffler off while I had things stripped down and it had very little carbon build up and the rings and bore look great. I think regular running and a good oil/fuel mix is the trick.