hey loveit:i wound using the stock engine mount.but what im really having trouble w/is starting the os.28 xz for the first time.i have the ofna blue truggy starter box,and ive already had to buy a new wire kit for it cause i over heated the wires trying to start the xz. i seem to get the best sounding turn over pre-heating the engine ,w/a heat gun ,to about 260 degrees. still wont start though. doesnt that seem kinda hot. im using a p-3 plug. i know the os engines are super tight though. are you using the needle settings given in the little os .28xz engine booklet.or have you found a better starting point for the needles.im getting really feed w/ my new truggy. wish i would've waited 2 months before i bought the hyper st cause i would have invested the money i used to buy the truck, engine, and starter box on a new 8ight-t 2.0 rtr for my first truggy. i was so upset i put the un-used truggy,w/the os .28 xz (never even started)and the ofna truggy starter box on ebay as a one buy deal. threw in the old mac star never been broke in but needs a new pull start, and paper work ,transmiter, glow iginter, and pro blue,black, purple and white body w/supporters for $700.00 and a reserve of $650.00 and didnt even get one bid. thats a...,oh i would guesstamate $1000.00 for that set up brand new like mine is. so all in all im not liking my idea for ofna hobao for my truggy. well good luck to a both of you guys let me know how that xz turns out for ya, clay unruh