The video showed the primer under the blue button on the 8hp but it's the same primer. If it's worn or deteriorated they are a bugger to start.
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I had a similar engine as the one you have. Mine started giving me the same symptoms as you are describing. There should be a primer bulb inside an aluminum housing( just to the side of the little blue button). This primer is made of mesh with a rubber sort of coating. After several years the...