lrp shark ft problems

[paul booth]

hi, i have two lrp sharks both with novak mongoose 10.5 systems inolabs metalgear digital servos, trakpower 1600mah 2s lipos, they keep blowing up i bought the second shark as a spare they were both used for racing but im just using them as bashers justnow and put smaller pinions on them but these wee things must do about 40 or so, hope somebody can help me miby they need a smaller spur or something