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    Is it compression relief or something else - 28D7070123-01 11.5HP

    I have an old 28D7070123-01 11.5HP engine on an MTD riding mower. When I try starting it, the flywheel only turns part way then stops. I also hear a wheezing sound that sounds like pressure being released. I tried starting once with the sparkplug removed and the the flywheel rotated normally...
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