Engine Scag Turf Tiger

[eddieirvine]

I have a 27hp Kawaski engine on my Scag it runs great starts up no problem mower engages no problem and I can mow all day! but when I shut off the mower in just a short time the engine will surge up and down on any speed I have the throtle set to does it most at half or full throtle settels down a litte bit on lowest speed on throttle, Check the gas it is clean and fresh, cleaned the carberator up with carb cleaner, Air filter looks good, took fuel filter off and was going to change it but nothing was in it clear one you can see through, and I changed it last year so put it back on! I can hold the govenor by hand and it runs at a steady speed like it should if that means anything? runs like a top until it gets good and warmed up the surges quite badlly! Any suggestions would be greatly appreciated thanks Eddie To add to this is never surges under a load meaning when mower is engaged and I am mowing it never surges!