ihave the tiger drive it broke on me the first time, because for the genesis /nemesis you need to press the bearing into the housing farther so that it gets better grip on the 5.0hp motors crankshaft. I believe there is a warning on their website and/or might be a pamphlet that comes with the tiger drive now telling you to make sure and do this, Anyways the first one broke and tigerdrive replaced it free ( it took them forever to send it though) And once i did what they stated i never had a problem again. I use a 7.2 volt drill to start the truck ( its a bit slow turning over but its enough to get it started fairly quickly)