Ah Ha...!
I previously used SeaFoam, now I use the Walmart house brand for everything...I run it in all my boats and equipment...won't hurt to try a can per the instructions on the bottle (either brand).
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Thanks guys, I’ll give a fuel additive a try. And it is a carbureted engine. 
No offense to the OP... Why didn't Larry's Machine either break-in the motor for you or give you explicit instructions for doing the break-in the rebuilt motor? I'd be hesitant to take anyone's advice that wasn't the manufacturer or the rebuilder, just in case something went wrong during the break in period.
Don't kid yourself. A "completely rebuilt motor" is not "basically a brand new motor as if it rolled of the production line last week".....not even close!
Plus if its 'tight' enough after a rebuild to make it idle rough, you would not have a motor for than a minute or two.
Years of 2 stroke builds, lots of performance work. The motor shouldn't be that "tight" after a rebuild, ever. How does the boat perform outside of idle? Likely a carb adjustment, but also worthy of a complete check to make certain everything is buttoned up properly.
There are many camps on break in, some say run it like you stole it, other say baby it. There are a lot of factors that can contribute to one or another. Since they did the work at no charge I'm going to assume they re-used as many parts as possible. Likely honed the cylinders and maybe replaced rings if the pistons weren't too bad at best, or just tear down and inspect. If it is new pistons and rings I would run it moderately for a few outings before you beat it like a bad dog.
There are many camps on break in, some say run it like you stole it, other say baby it. There are a lot of factors that can contribute to one or another. Since they did the work at no charge I'm going to assume they re-used as many parts as possible. Likely honed the cylinders and maybe replaced rings if the pistons weren't too bad at best, or just tear down and inspect. If it is new pistons and rings I would run it moderately for a few outings before you beat it like a bad dog.
To answer your original question, break in period should be about 10 hours, at varying rpm’s and not over 4,000 rpm until after 10 hours.
And yes, even a new or freshly rebuilt engine should be able to maintain idle once it’s up to normal operating temperature.
And yes, even a new or freshly rebuilt engine should be able to maintain idle once it’s up to normal operating temperature.
After reading all your responses which I appreciate I’m going to say it’s just an adjustment as the engine runs like a sewing machine when on the lake and in the driveway. It’s only when it’s under load right after it’s launched that I’m having issues. Like I said, I’m ignorant right now and just trying to learn and you’ve all given me some good information.
Thank You
Thank You
Holler at me if you want to try launching it during the middle of the week when all the clowns aren’t around.
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