Keep in mind that those motors do "seem" to run hot, as the heads have very tiny passages that the water can get through, and only the forward outer rim of the exhaust cover is cooled. As such, the area around the spark plugs and most of the exhaust cover will get very hot indeed. When you shut the motor down, particularly after a hard run, that heat will dissipate into the surrounding parts of the powerhead, making them feel warm, too. Not saying you shouldn’t check for blockages, particularly in the horizontal passage along the top of the block, but just wanted to remind you that there will be heat in there no matter what you do.

I’m assuming you are running in fresh water, so salt build up is not an issue

Check for excessive wear on Plate under the Impeller. If there is a noticeable ridge on plate the motor won’t pump enough water up to the powerhead. Found this out the hardway a couple of times. You can repair the Plate with coarse sandpaper then finish with 320 grit. Plate should be flat.