What kind of spark plug does my power washer need. Its a Ridgid RD80706

Go here and search for model#:
https://www.ridgid.com/us/en/literature-search

Run some carburetor cleaner through it first. Go to autozone, etc, and pick up some fuel system cleaner you can put directly in the tank and run it through.

All you need to do is remove the rubber boot that covers the spark plug. This is the wire that transmits the current to the plug. This just pulls off. Once you expose the spark plug you get a deep socket to fit in around the spark plug. Probably a 5/8th, could be bigger. Turn it counter clock wise, pull out and replace. Done deal. There are spark plug sockets that have a retaining gasket in it that holds the spark plug as you pull it out but not necessary.

Sounds like the float is stuck open. A few taps with a screwdriver handle on the fuel reservoir might fix the problem.

dosent really matter as long as its the same size and length ( start with short one and make sure enchine moves smoothly when pulling cord (avoid piston hitting spark plug. you can measure with a pencil when piston is top dead centre

Go here, search for your model number and read the manual.
https://www.ridgid.com/us/en/literature-search

The choke reduces the air flow into the carb. If you are having problems with the choke off, it means that not enough fuel is getting into the engine and it is running lean. When you choke it, the reduced air flow causes the mixture to be correct and it runs fine.

Go here and input your model number to search for your manual. The number is in there.
https://www.ridgid.com/us/en/literature-search

Go here and get the manual. Inside you'll find links for your engine and the numbers you'll need to get the literature.
https://www.ridgid.com/us/en/literature-search

the needle valve in the carb is not seating and gas over flows into the crank case