It seems like the governer is not working, when it loads up on grass it kind of boggs down. It has a kawasaki engine I think it's a 20 hp. fd590v. I don't have a manul on kawasaki. All other engins say to ajust the governer spring up or down to incress or decrees senativity, this engine only has one place to hook the spring. can anyone tell me how to ajust the governer?