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Feels like my tractor is only at half the power

1135 Views 13 Replies 8 Participants Last post by  markusedma
I just changed out my cylinder head and rods. I cut grass for about 1 hr and now it seems like I'm only getting half the power. I took off valve covers on both sides and all looks ok. 1 spark plug was dry and jet black with soot the other was damp and gray looking. I have a Briggs & Stratton 24 hp els725 ohm engine. Muffler sounds a little muffled too. Engine sounds weak not like when running good. Any ideas.
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After having a big backfire I would check the flywheel key. Remove the nut on the end of the crank and make sure the keyways in the crank and flywheel are lined up.
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