Hi First off I want to say great site, Newbie to the site here. My problem I have a ~1990's Ferris Walk Behind with Kawasaki Motor (manual Pull) Might be 14 hp but dont know since I bought it used over 3 years ago. I believe it is 48" Deck with 3 blades. Been working great since I bought it used with general oil/filter changes, new tires and grease. I dont own a lawncare business but i own 2.5 acres which I cut every week or every other week during spring-fall. Last winter I stored my walkbehind like I always do and this spring I went to take it out of storage and noticed that a door was open near the mower and had the elements on one side (left side) for about 1-2 months. It was still inside a garage but a regular door was left open so that rain or snow could get on it and the last time I checked the garage was 2 months prior to going back and getting it. I start it and it fires right up but the RPM's go pretty high and any adjustment to the throttle does nothing except choke and off. I was planning on moving it on to my trailer to take home and tested the blades and I noticed that the "high" RPM whale does not activate since the RPM is pretty high as it is. When i went to cut some grass to test it out it started to bog down which it normally does not do with respect to the height of the grass that I went over. I know that going over very tall grass does a number on RPM/Engine so I know it wasnt the height of the grass that was causing the stress. I''m thinking its the Carb or the Switch located at the handlebar but I am not too familiar with lawncare equipment other than changing belts, tires, bands, and simple adjustments. Can anyone help out a noob?