i wouldnt expect that engine to last a really long time (because it is inexpensive) but i dont know for shure...if you are looking for a cheap .21 i say this one: http://www.rcboca.com/product.php?pr...2&cat=7&page=1 at the track the other day and i was amazed at how much torque it had for such a cheap engine...but then again that might not last that long either.