I am doing an HSSK50/LH195 now. I got the engine for $25 from a snowblower guy. the problem is, the motor was stored on it's side in water. The head had to be cut off because the bolts refused to let go! got that sorted out and checked the bore... nearly new with factory hatch marks in tack.
the problem with the motor is the 7/8" pto. i turned it down to 3/4". but i'm not doing what Delray did... i'm not a ball bearing side cover type of guy, i view that as overkill, and the side covers are hard to find and expensive. instead just turning the pto to 3/4" and re-cuting the keyway.
i will use a Precision 30/30 cam (basically a dyno245 copy) and keep the CDI ignition cast flywheel.
http://www.pinrepair.com/minibikes/p/hssk50crank1.jpg