Hey nitro, Ive got the same " junk " starter and it works great if you use it with 24V. Ive got the smaller of the two starters and can start .67 engines with no problem. Ive been using the 24v setup for over a year without hurting the starter, just dont spin it for too long. I had the same problem when using 12v. I use two gel cell 7amp batterys.
~ James