Fishing Wiskers

I reset the computer to factory, solved the problem,

Top speed is 30mph on flat grass ground. but it will not go up minor hills forward or reverse without a runing start. If you start at the bottom of the hill machine will stop about 1/2 way up. I have the engine cover off and you can see the outside of the drive clutch will stop spining., and the engine does bogg down some. Dosent matter if engine is cold or warmed up. Seat belts are connected. Fuel is clean I am the 5th shop to look at it and different shops have replaced the fuel pump, injector, ign coil, wet clutch, I am not sure how to check for codes with this machine, can anyone teall me how to do it? Compression with hot eng is 145, valves adjusted to .005 with a cold engine. Dash shows 426 hours I am not convinced it's an engine problem