Hello various GT-Talk members! I am new to the site, but have used it's forums before to help me out with other problems. I've visited so much, I decided to go ahead and make an account.
This may be my most challenging problem yet. I have a '63 Cub Cadet Original with a Kohler K161 engine on it. I recently got it running after it sat outside for about 15 years. Upon its first start, it happily sprang to life with no misses or backfires, at idle, without the need of choke. I soon found out that it wouldn't run wide open. I checked my throttle connections, and couldn't find anything wrong with it. So I investigated further and found out that when no running, the throttle brings the carburetor to wide open, and has full range of motion, but when the machine is running, the throttle can barely raise up to half. The carburetor can be manually pushed to wide open, and it runs well at that speed, but the throttle can't seem to bring it there on its own. I figure that it must be a governor problem. So I took the governor arm off, cleaned all the moving parts, and reset the governor arm, but it changed nothing. The K161 has an internal governor. No governor spring visible or anything. The throttle cable runs directly to a disc that pulls on the governor arm, which is connected with a little rod directly to the carburetor. I don't know how the internal governor works, but the engine is 51 years old, so it can't be too complicated. It has to be the governor because the throttle has full range of motion when the engine is not running, and the governor obviously isn't working when the engine isn't running. And as I said before, when the engine is running, the throttle on the carburetor visibly cannot move any more than half way to its max, with the throttle lever at full. I'm stumped. If anyone has experienced or heard of anything like this, any information at this point would be helpful. Thanks in advance!