Honda Express auto choke
What people probably do wrong in cleaning them is they may mess with the adjusting screw or not seal them when they put the cover back on. Just take the little cover off and spray it out with some electrical contact cleaner, gently lift the little thermal reed and get under it too. Don't mess with adjusting it. Put the cover back on and seal it with a light coat of RTV silicon. Make sure all of the hoses are tight and not cracked, better yet, replace them if they are old.
They work off of engine vacuum. If there are any air leaks, they won't work correctly. The little reed plate is a bi-metal thermal valve that slightly bends when it senses heat from the cylinder head. When this happens, it acts as a valve and shuts off the vacuum to the choke.