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    B&S Model Interchangeability?

    I need to replace a B&S 445677 0421 E1 engine. I have located a 4457770231 E1 engine. Would these engines be interchangeable?
  2. D

    Motor Difference Question

    I need to replace my Briggs & Stratton engine. My old engine is a 445677-0421-E1 and I have located a new 445777-0129-E1, but haven't been able to look at it yet. If I read the model number right, the only difference between these two engines is the output shaft designation (6 vs 7), but i...

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