Careful with roto-starts bud. they are not all they're cracked up to be. They really slow down your engine, they strip out the one way bearing. They break, etc. etc. I would say after about 6 months you will have spent more money on parts and stuff to pay for a good starter box, and battery, and charger.

I am speaking from experience as I used to use them, before I learned the hard way. Just FYI