It should be ok. You say it does fire up.

A couple of other things. During the break in, you will be going through a lot of fuel because it's so rich. You want a good amount of smoke coming out the pipe 'stinger' and you'll also notice quite a bit of fuel/oil spitting from the pipe as well. This is good. Don't worry about that.

Tuning a nitro engine can seem like Harry Potter stuff, but it's not that hard.

At all times, you want a nice stream of blueish/grey smoke coming from the pipe.

After your engine is broken in, set to tuning it.

Never try to tune a cold engine though. Get it up to a nice operating temperature then start tuning.

Here's what I do:

Once engine is at temp, pinch the fuel line shut about 1 inch from where it meets the carb. Ideally, the engine should rev up and die in 5 seconds. If it dies real quick, you're too lean, if it dies after, you're too rich.

If it dies at 5 seconds, start it back up and run it back and forth for a bit. Now, let it stand at an idle for about 7 seconds. Then mash the throttle trigger down. If it boggs and sounds like it wants to die and then starts to accelerate slowly, your low speed needle is too rich. It should pretty much shoot off the line when you hit the throttle. Lean the low speed on hour incriments at a time and repeat the stand at idle for 7 - 8 seconds and take off process until the car shoots off pretty nice.

Now once that's done, turn your attention to the HSN (high speed needle). Once you shoot off the line and get it up to speed, does it sound like it bogging down a bit? Is there a lot of smoke coming out of the pipe? If so, start turning the HSN clockwise in 1 hour incriments. You'll start to notice it goes faster at the top end and each time a little less smoke is coming out of the pipe. If you turn it too much, there will be almost no smoke coming out of the pipe and the engine will start to over-heat. NOT GOOD. Turn the HSN back one hour and you're set. Keep a nice thin stream of smoke coming out of the pipe. A quick field test for over heating engine (if you don't have a temp gun) is to give a light spit on the top of the cooling head. If it bubbles off nicely you're OK. If it fizzes off instantly, you're running too lean and over heating. Richen your HSN a bit.

Remember, other factors come into play as well; ambient temperature, humidity, elevation, etc. So if one day your engine is running fine, but the next it's not, you probably just need to slightly retune it.

Also, keep a few spare glow plugs at hand. These wear out and will need replacing every so often.

Good luck.