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    Briggs & Stratton 21hp platinum engine hard to crank and knocks!

    Hi, So, I recently completely rebuilt a Briggs & Stratton 21hp platinum engine(model #: 331877-1234-B1) It had thrown a connecting rod and punched a hole through the crankcase. I ordered the parts I needed which included and connecting rod, crankcase/engine block, crankshaft, and an oil...
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