ORIGINAL: w8ye
Looking down through the thread, there were a couple references to Magnum 52 four strokes not having the power of a 46 two stroke.
I've seen a lot of the Magnum four strokes with less than satisfactory power.
These poor performing ones I've personally looked at had the cam timing advanced one tooth. This gave a great idle but took the engine performance down one prop size.
These engines when the piston at top dead center had the cam timing mark straight up and down. Either 6:00 or 12:00. And this was from the factory!
The proper timing position is in alignment with the push rods. Preferably with the mark dead center with the exhaust cam follower hole.
My Magnum 52 had the exact problem. It was advanced one tooth, so I backed it one tooth. I think it helped, but is still in the break-in phase. I readjusted the valve gaps afterwards. But this particular engine has the valve "clicking" sound louder than my OS 70 and TT 75 4-strokes. Is that normal?