Clutch needed for hi torque engine

[mudwizer]

I am building a mustang lookalike using a kohler 12 hp . I am looking for a belt clutch that can hold the torque. I am thinking about a torque converter using a jackshaft. I have no problem machining the crankshaft. I have two engines m#231the crankshafts are 1"and 1 1/8" Any of you all have any ideas how to build a clutch system for my bike, or I could use a transmission
Thanks in advance

 

[ATKRIDER]

When I use to work on the big Kohler powered soil compactors (ground pounders) they used a HD dual V-belt clutch that was pretty much bullet proof. Seems they were made by North American Clutch and were for the 1 1/8" cranks. I know they were salty-like $1000.
I THINK I might just have one laying around that could use a new home-

 

[bikebudy]

e-auction # 331178977925 :shrug: