I pickup an old Cushmen Trackster. I was told the engine was bad and was removed. The engine had great compression so I reinstalled it got it running drove it from the back yard to the front yard shut it off. Three days later if fired right up wouldn't move at all I changed the filters the hoses to the coolers still no luck... My question is are these worth messing with or should I just pull the whole system out and re-power with hydraulic pump and motors. Looking at the manual is looks like it would be fairly easy just a little fabbing.