yea, they do but its just that thos motors have weak internals... They make good power just cant handle it. I know one guy dynoed @ 190hp with 9lbs i believe. The rods are really fragile.. I thikn the zoom zoom boom club originated with the 3rd gen FS motors. I think personally that with some really good tuning u can keep it runnign with out throwin a rod to atleast 12lbs.





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