Simplicity 5212.5 Mower, Lawn and Garden Tractor Category
Original Model: 404707 12.5hp Briggs Opposed Twin
You would have to use your muffler and possibly your intake manifold off of your original engine. If you have an electric clutch, you will have to use your alternator and regulator as well.
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While we may have sold many engines listed above to be used for a Simplicity 5212.5 Mower, Lawn and Garden Tractor Category, we are NOT claiming these are exact replacements unless the product notes explicitly say so. Many original equipment engines may no longer be in production because of obsolescence or EPA regulations, so in some cases there may not be an exact replacement available. Our intention here is to show that other customers have utilized these in the equipment shown, but may have had to make some modifications to do so. If we know of any required changes, we will list those, however, some adapting during installation should be expected.