I love my Roto Start so much. I know they make them to fir the 24.7 but not sure about your .12. I put a Savage 21 RS back plate on my storm and ahvent looked back sense. Get the fuel tot he carb, good glow going on and it cranks up first try. I'd advise you buy 2 or 3 batteries to gow ith it and charge them up before you go Bashing. Sometimes your friends wanna borrow it trying to crank the hellhole of a engine they ahve that uses all your batteries. I love mine now get one!