I would just check valve clearances. I ran mine out of the box, and as it turned out the valve adjustments were out of spec by quite a bit. The manual says how to set the carb needles, and when I set my LSN according to the manual my engine will not start. So my settings are HSN 3.5 turns out from closed, and the LSN 5 turns in from 'all the way out'. That is what has worked the best for me so far. YMMV.

Get a good battery for the glow plugs. 5 plugs eat a lot of current. The first time I tried running this engine I had two of those large 1.5V dry cells wired in parallel and the 5 plugs drained them in a matter of minutes. I then made up a 10A pack of C-cell NiCds which worked fine. Now I am using the Microsens Glow5LP and a 8A LiPo battery.

If you use a fuel filter in your line, be alert for it to cause any fuel delivery issues. Mine was giving me fits until I figured it out.