http://rcboat.com/cr.htm

This is what was posted on the web site noted above about initial motor break in. Very different from what I have read on this site particullarly with regard to running without water during breakin.

Comments?

"After you have the engine back in your model, it is time to break in the engine. A Boater/Engine Builder (Steve O'Donnell), who I respect a great deal told me some time ago about his break-in procedure. I have been using a variation of it with VERY good results. I remove the water line from the rudder assembly and make sure that I have the needle set on the rich side of perfect. I use a mixture control, so that is easy. For those of you who don't have a mixture control, get to the rich side of a perfect needle. I launch the boat and run around the course, giving the engine full throttle for at least 1/2 of the straightaway and then reducing the throttle to half in the turn (allowing the mixture to richen), then full on 1/2 of the SAW, then reducing to 1/2 in the turn. This "Heat Cycles" the engine and the liner/piston fit will be terrific. I usually run 4-5 tankfuls of fuel through the engine before I ask the engine to "do its thing". DO NOT run the engine very cold, with the water line connected, as it will not break in at all. You MUST heat cycle the engine to break it in!"