Here is the new release from TIGERKING the both of us have came up with a very nice 26cc not 25.4 cc engine like other engines that are mass produced. The crank is a full circle crank.34mm bore and option of with Carburator Walbro WT-1048 .comes with EZ-Starter,NGK plug,Billet alum intake.comes with all to be ready to run out of the box. these with you zenaoh/RCMK style engine mounts and it is direct drop in from you old engine to this engine. You will love the horsepower this engine makes right out of the box.