RE: breaking in problems
Get a heat gun (a hair dryer will work but not as well) and preheat the engine, loosen the glow glug a little bit to relieve some compression (you'll have to use a seperate glow ignitor and retighten the plug once the engine starts), prime the engine by taking the preasure line loose from the pipe and blowing into it until the fuel JUST REACHES the carb, in extreme cases you can take the glow plug out and shoot a VERY SHORT shot of WD40 into the glow plug hole.
Break in can be a real pain. Especially the first few starts but it's well worth keeping your cool and doing it right.
Good luck