Briggs and Stratton 104M02-0020-F1 163cc 725Exi Series Push Mower Engine

Briggs and Stratton 104M02-0020-F1 163cc 725Exi Series Push Mower Engine

Briggs and Stratton 104M02-0020-F1 163cc 725Exi series push mower engine with 25mm x 3-5/32" length crankshaft


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This ships with an aluminum base that will either need to be tapped or for pass through bolts. I emailed B&S and asked for the replacement engine for an older 21” Poulan mower and this is what they suggested. It fit perfectly on the mower deck after I tapped the three mounting holes to accept the original attach bolts. The engine brake is configured 90 degrees from the original, but the original cable had enough slack to accommodate the slight reroute. This engine burns oil rather than requiring changing, so checking the oil often is a must. The manual intimates that synth 5-30 is best for all temp ranges.

It started on the first pull and continues to do so. This was a big jump up from my previous 6.5 motor, and the increased torque and HP makes the mower really get with the program. The new engine seems to weigh a bit less than what it replaced, and while that translates to being somewhat easier to maneuver, it seems counter-intuitive to it being a more powerful engine.

Starts 1-2 pulls and runs great

Bought this to replace my Briggs 175cc engine off a 2009 Troy Bilt. It bolted up easily, but I did lose the self propel system since I needed a 7/8 adapter, my original mower was a 1", so all accessories wouldn't work. I found one at Loews that worked with no issues( Arnold 7/8" keyed adapter kit). After removing the drive system, it started first pull out of the box with a little fuel and half a quart of oil. It handled my lawn pretty easily, its definitely a strong motor. Its also assembled in the USA which is good to see. It says you never need an oil change, so it will burn oil, checking it is important. There were some obvious cost cutting measures evident when comparing to the original engine, but for the money it does the job, and so far very well. My one big concern is about how light the engine is, the original engine was 32 lbs, and a similar replacement from China is about 30, while this engine comes in at only 24 lbs. I guess we'll see how it will hold up long term. Ill definitely update it after a season or 2. Would be 3.5 stars if available.

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