Small Engines (Lawn Mowers, etc.): Snapper drive disc measurement on crank, crank shaft, engine shaft

Question
Hi Eric,

I have a W280922B that I re-engined with a new 11.5 HP OHV B&S engine.  Stupidly, I assumed that the position of the pulley and drive disc would be indexed. Since they weren't, I eyeballed it.  First time was too high (the old drive disc/pulley were reused, but the rubber ringed driven disc was replaced). I tried to measure the distance on the old engine shaft and replicate it on the new engine. Too low (neutral still hit the driven disc). Burned out the driven disc within 3 hours.

How do I properly set/adjust the drive disc on the crank shaft? Can I use a spacer/washer to "raise" the engine relative to the frame to achieve the proper orientation from the driven disc? Most importantly, what is the proper measurement, and what is the correct method of measuring the position?

Thank you for helping out a newbie!

Jay

Answer
First measurement is from underside of mounting surface of engine.  should be between 3 and 3/4 to 3 and 13/16 max  to smooth surface of drive disc. If not looasen the set screws up on drive disc and adjust accordingly.  Second there should be a linkage on the left hand side, the shift yoke,  move spring to top hole on linkage and to the furthest back on yoke.  More if needed


Owner's manual link:

http://bsintek.basco.com/BriggsDocumentDisplay/default.aspx?filename=hfhrzJvLlSZ...