Very good Blue I forgot to say that. Bubb If you are wondering what that is. Blue is just telling you to make sure when cooling you leave your piston at the bottom of the cylinder. You can determine this by taking out the Glow plug and looking down the cylinder then spin the flywheel so the piton is at the bottom. Once you determine the bottom you can mark the flywheel under your r/c with a magic marker so you know where the bottom is with out taking the glow plug out everytime. You will also get a feel for this the more you do it.
I hope this helps anymore ? feel free to ask. Especially if you don't understand what we are talking about. Good luck Greg