I have a 345 with the liquid cooled kaw. motor. It seems to run alright, it revs up, holds a low idle. But when you engage the pto and put it under a load, its like a S10 pickup with 40" tires. It just boggs down and doesnt have enough power to cut. The deck is in perfect condition, good bearings, etc..... New spark plugs, carb has been recently cleaned,new fuel filter,new air filter, good pressure coming into the carb and I adjusted the governor(not much adjustment there). Any other ideas guys?