Thats a vertical shaft, You wont be able to use it, unless you use a gear box or right angle drive. Been there done that, Its a pain, I just finally went and found a horizontal shaft engine, I always seemed to loose power through all the gear boxs and belts and everything, And I burnt up a lawnmower transmission or two while I was at, Same transmissions they use to race mowers.
The only cool part is, That with a lamnmower gearbox you get reverse, and a 3 gears, With the box I used.
I suppose you could just use heavy duty right angle box with minimal problems, But I say just get a horizontal shaft.
I picked up my 18 twin for 50, Although, I didn't know the exhaust valve seat had fallen out.... I did get it fixed, just now one side has two intake valves lol. Runs good though.
