Briggs & Stratton31R907-0007-G1 500cc 17.5 Gross HP Engine with 1-Inch by 3-5/32-Inch Length Crankshaft Tapped 7-16-20-Inch

Ordered this engine as a replacement. I had a 15.5 Hp engine in my lawn mower before this one's a few more Hp. Install was pretty easy. Disconnect all the electrical.Take out the center bolt on pulley after taking your belts off. Slide the pulley off.There are four bolts holding the engine in place. These are self-tapping bolts. You do not need to tap the holes on the new engine.Pull off old engine, put new engine in place. Line up holes.Take manufacturer bolts. Put it into the hole with an impact gun and just have at it. The bolts are hardened steel & will cut into the soft metal. They do not need to be tapped beforehand.Make sure the key is either on the new engine or in the pulley slide that onto the new engine put bolt in. (At this time you need to add oil add minimum 1 quart)The connector or wires that went to your ignition solenoid from your old engine. Just hook up the wires from color. Mine were black and gray, I had to do some modification to the wires. Put waterproof crimps on the wires with heat shrink.Took the end off the yellow wire connected the yellow wire off the rectifier to the red wire coming from my engine harness. That's what powered my battery.Before installing the belts and hooking up the fuel, try just cranking the engine over a few times to get the oil splashing around through the engine. Then you can hook up the fuel and hook up your belts and start it up. (AT 5 HOURS OF RUN TIME NEED TO CHANGE OIL IN ENGINE SINCE IT DOES NOT HAVE A FILTER MANUFACTURER RECOMMENDS) After that you can change the oil once a year. Good mowing.

Nice engine, installed on toro time cutter SS4225 bolted right up. I did have to tap out the new mounting holes on the new motor. Does not have oil filter or fuel pump. Designed for gravity feed tank . Great value for what I needed thank you!! Box arrived no Damage

Fast delivery of engine...Engine new and no damage noted

I am a do-it yourselfer and have a 2017 Troy-Bilt Pony that originally had a Briggs & Stratton 17.5 Power Built Engine after 6+ years of use and just after replacing the 42" Deck completely, the compression relief valve decided to break preventing the engine to start. So, I was faced with attempting to make that engine repair, (internally) for a new compression relief valve part (priced at $200 for the kit only), plus my time and risk finding additional internal damage to other internal parts or replace the engine entirely. After looking at the cost at new riding lawn mowers, plus the fact I already replaced the deck I opted to replace the engine. This Briggs & Stratton 31R907-0007-G1 500cc 17.5 Gross HP Engine installation was easy, providing you take your time and review YouTube videos prior to starting the job. I suggest you pre-tap the mounting holes with a 3/8 x 16 tap in order to reuse the self-tapping mounting screws. I had to use a utility propane torch to break the hold loose on the crank. I removed / re-used my original exhaust. Engine removal was easy, take photos of fuel lines, linkage and wiring just in case. New engine lined up and bolted right up. Had to remove the new muffler (1/4" Allen). Wire harness took some study. In my case I swapped out the wire harness for the fuel solenoid with my old harness so that the gray and black wire from the fuel solenoid and the black wire from the ignition coil would easily connect to my original connector. I clipped and re-used the connector from the red and black wire from the stator alternator to connect to the voltage regulator, red wire to red wire from voltage regulator and attached the black wire to the black ground wire on the voltage regulator. Did not have to do anything with the yellow wire. Attached battery (hot - red) cable to starter. Added 44 oz. of Briggs & Stratton HD30 Oil to filler tube. I kept my old dip stick because I liked the yellow color cap. Turned the key and it fired right up. Hopped on any mulched the leaves. No adjustments to the carburetor or linkage were required. Took me overall 8 hours by myself, (cautiously). Glad I did it. If your mower is over 6+ years old and the deck and transmission are in good shape I recommend swapping the engine. I also recommend that you consider replacing the upper and lower transmission drive belts if needed. Also suggest you also take apart and clean the steering linkage / gears while the engine is off. Hope this review helps.

I purchased this engine to replace a blown engine in my MTD riding lawn mower.First, the good news. this engine was an exact fit, was an easy install, and started right up with no adjustments. As others have noted, the shipping box was damaged, but not the engine and the mounting bolt holes were not threaded. My engine was shipped with only minimal assembly lube/oil installed. I topped this off with fresh oil and ran for two hours before completely draining and refilling.Now the bad, the write up says that is engine has a regulated 9 amp DC alternator with no schematic or explanation of outputs.. It actually has a 28v AC alternator and a diode bridge to supply 14v DC current of 9 amps. This engine was listed as a direct replacement(on another site) and mechanically it is, but electrically it is not. My old engine alternator had two wires, one with a diode and one with 14v AC, The wire with the diode charged the battery and the other powered the headlights. The 28 volts from the new alternator promptly burned out my lamps. I chose to correct this by wiring my two lights in series instead of parallel as supplied by the factory. The alternate solution would be to purchase 24v lamps of the same wattage. The write up says there is a paper filter with a foam pre-filter. I did not receive the foam pre-filter. Also the muffler supplied does not match the needed configuration and I had to reuse the original muffler.I only have 6 running hours, but the engine starts easily and runs great, I knocked off a star for the poor electrical documentation and the missing part.

Replaced original engine on an old 2009? LT2000. Almost plug and play. Runs great.

My tractor