I have a 4*60 with a GMS 76 on it and it flies the 4* very good. Take a look at www.gmsengines.com and you can get one for 85.00 shipped to you. I have bought 2 engines from them and the service is very good. The GMS engine was very easy to break in and it runs very good. It turns a 13x6 prop very easy and gives the 4* great vertical performance. Try one you cant beat the performance for the price. I also have a 4* with a magnum 91 4 stroke and it is the best plane engine combo I have. Here are some pictures of my two 4*'s

Rick