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Can I install a different engine on my lawn mower?

I am looking at major repairs on my Murray riding mower (Model 405000x8B). I have a Briggs and Stratton 13.5 hp (28R707-1120) I/C engine with a 40" deck and was wondering if I could replace it with a higher horsepower Briggs and Stratton engine.
Nancy, July 2007
You can install a 14.5 OHV briggs on it if you want, however as you get into the 16+ HP engines, the bolt pattern may not match up. It's not recommended for a mower to use a 16+ engine designed for a 13 HP. The briggs 12Hp through the 15HP uses the same bolt pattern. Depending on how bad your motor may be, going a little bit larger may not get the better performance as you may think. But the choice is yours !!!


Good luck !!

David, July 2007
link Click here to see other fixes for Murray 405000x8B.