ORIGINAL: wyo69cowboy
I have a Saito .82 and, in the process of learning how to tune it (my first 4-stroke), I know I had a few lean runs. It doesn't seem to have quite the power it initally did. Would a new piston and ring be beneficial? I haven't had it apart yet to actually see if there's any problem; just a feeling.
You should check the valve clearance. If it's a little loose, Saito tend to lose a little power. You probably won't get a lean run on a four stroke, many will let you know they are lean by knocking or throwing the prop.