Hooking up the linkages on the carb - Tecumseh Horizontal Tiller Engine 8 Hp, 1" X 2 57/64" Shaft, Modelno. Hm80 - 155656x

Throttle stuck possibly

U need a service manual unless you know someone who knows what is what. Nest time you will take a picture in advance before you disassemble something.

Make sure your engines governor linkage is moving freely. It is the linkage that the throttle goes to on the engine and then a lever from that linkage goes back to the carb. The throttle cable works through the governor to adjust to changing loads. Your linkage connections may be crossed limiting throttle opening as well. Look online for a throttle linkage photo and compare. Be careful and good luck!

look on the body of carb and does it have any cable and linkage on the opening of carb ? remove the large pipe between the airfilter and carb and look in the carb ! can you see a disc that open and closes with linkage ?
if nothing the you got an electronic choke and should have a moduel with wires to it an the side of the carb !

Sorry but is this a problem with your Car, generator, boat or motorcycle?
http://www.boats.net/parts/search/Honda/Generator/0/EB3000C%20AG-B%20GENERATOR%2C%20JPN%2C%20VIN%23%20EZGP-1001375/CARBURETOR/parts.html

There are many different linkage configurations. Go onto Briggs and stratton.com and enter your exact nodel number and type number and it will give you a picture of the options

They might have missed hooking up the vacuum line for the passing gear when they put the intake back on. There will be a steel line near the firewall coming up from the transmission. It normally plugs into a nipple on the intake behind the carb. If you can't find one just splice it into an existing line, except the distributor line.
The carb problem is most likely a matter of the linkages not being put back on properly, usually on the choke side because it has a lock outfor the secondarys when the choke is on. See if you can get the instruction sheet from the carb kit they used. It will show you what the linkage is supposed to look like when it is hooked up properly. There is also a vacuum switch on the secondarys. Make sure it has vacuum from the front of the carb and that it pulls tight when you start the car and lets off when you shut it off. Hope this helps.

SOUND LIKE YOU MISSING THE IDLE SPEED SOLENOID.I REMEMBER I HAD A 81 OLDS 260 V8.IT HAD THE 2 BARREL ROCHESTER.IT HAD THE IDLE SPEED SOLENOID MAKING CONTACT TO THE THROTTLE LEVER.

Sometimes crud and gunk build up on the carb ,carb linkage and governor linkage, preventing free movement of those parts. First I would clean all linkage points with a spray can of carb cleaner, and then lubricate these points with WD40 or some other lubricant. It's also a good idea to lubricate the control cables and controls.

You want the spring to hold tension against the governor.