Re: bought a replacement engine and it wont start.
Glad to hear you got-er going good mathersi
the engine will run better when it gets broken in and everything is seated in properly, internals are a little outa wack before things wear in a bit, then in my experience the engine starts to smooth up and run much better, some do it quicker than others just depends on the engine.
I had one smooth up good after about 150miles and another just started really running good at about 300miles, just do as someone suggested and run a little extra oil in the mix and I dont recommend going on long full throttle runs right off the bat, I did that and burned up an engine, it wasnt too lean and was running great and then I went on a 6 mile trip and run it WOT most of the way, that was a mistake I should have took it easier for a while and I think it would have been OK, so just to be on the safe side i would not run WOT for any long distance until a 100 miles or so on it, just my opinion which may or may not be 100% correct, but I dont see how it will hurt a thing to be a little easy on it for the first few miles so you dont over stress things before they get seated in good since the machine work on these engines is a little on the rough side.
Peace & happy safe riding!
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!