Grey, I've never heard mention of a Magnum needing a rebuild any more than any other four stroke. Look at Saito... for the price you pay you wouldn't expect it would eat bearings, but I've read of it happening, in just a few gallons. I believe Saito rectified that problem. But I'm still not paying double the cost of a Magnum for an O.S. with .10 more HP. Some of the guys on the Magnum post in the Glow Engines section have been running theirs for years with no problems. What w8ye said about HobbyPeople and Global standing behind the Magnums is true, what is the warranty?, several years if I remember and if ANYTHING go's wrong, they repair or replace it, it's one of the reasons I wasn't worried about buying one. Saito looks prettier on the outside, but honestly I could care less considering my engines are cowled. As long as it gives me good service, performance, runs well, and doesn't give me fits I could care less who's name is cast into the crankcase. Actually, I've read the "rebuild sooner" comment many times on four strokes and they were referring to YS. O.S., I've read just as many people having a love hate relationship with. I've seen more than one post by a O.S. four stroke owner who's been in RC for umpteen years and can't get the O.S. tuned right no matter what they do, I think those are usually the pumped variety. I've also seen them for sale on RCU Ads and the person actually stated "Never could get it to run right". You may blame the user for that. But someone else could blame you for your Magnums needing to be rebuilt more often. Be that as it may, I can still rebuild my Magnum for 1/10th the cost your paying for O.S. parts.