33S877-0019-G1 Professional Series 19 HP 540cc Vertical Engine

I don’t do many reviews on products, but in this case I will. Because this information may be very useful to someone else that had the same problem or concerns. My 42” inch cut Husqvarna model YTH18524 engine shattered the piston arm cause of the balancer broke and it made the piston rod just explode. The motor was the 18.5HP 33R777-0005-G1 and I was looking for replacing just the parts. But it was a catastrophic failure in the motor. So I was on a hunt for a new motor… come to find out, the 33R777-0005-G1 are discontinued. So now I was upset cause now, I need to find a new Mower now versus a new motor… I was upset to say the least. But I started doing a lot of research on replacing the motor still. From the marketplace, eBay to amazon. Wasn’t sure buying a used motor on marketplace or eBay would been the best idea.. So got on amazon and seen the 19HP 33S877- 0019-G1 Motor. I researched into this motor extensively to make sure all components are compatible with my Husqvarna YTH18524. To my surprise, it was compatible with my mower. So I ordered it. I came fast, earlier than expected. Packaged well. Took the old motor out and dropped the new one in. Note the 19HP 33S877-0019-G1 “DOESN'T HAVE THREAD FOR EXISTING BOLTS” you can either use a threader and cut your own threads or you can get bolts and just bolt it on. The motor mount holes lined up perfectly and bolted on with ease. The electric harness was an exact match so all I had to do was plug and play, and connect the starter wire. Now with my mower it’s not a side exhaust, it’s a front exhaust and I ordered the 532137352 Muffler Kit (Muffler & 692236 Gasket) for Husqvarna and took off the side muffler that comes with the motor and switched with the front muffler and it fits perfectly. Pleased with how easy it was to install and pleased with how it runs. Be sure to add oil to it before starting it. The motors don’t come with the oil in it. So be sure to add oil before starting. As for value. It was well worth buy the motor and replacing that instead of buying a new lawnmower. And the power of the lawnmower was exactly the same as the old motor I took out. Hope this helps someone else out there.

Perfect fit and easy to replace. I bought it for my daughter who's motor locked up. The mower was only two years old and so now she has an almost brand new mower agaiin

This motor was easy to install. It replaces the 21hp motor with no alterations needed. I do not notice any difference in performance

I used this engine for a Craftsman 42 inch YS-4500 mower (917.27664). The original engine was an Intek Gold 20HP (31P977-0670-E1). It was a virtual drop in. The electrical harness and fuel lines hooked up without any modifications required. I did need to reuse the old muffler, as the one the new engine came with wouldn't fit under the engine cowling. Not a big deal though. Disassembly of the old motor was easy enough. Four engine mounting bolts and the drive pulley bolt. But you will definitely want an impact wrench to make your life easier removing the fasteners. The old engine and the new engine were easy enough for me to lift by hand without help. There were a couple of things to look out for on installation. This engine does not come with new mounting bolts, so keep the old ones. Also, it will be a lot easier if you can run the bolts through the mounting holes on a bench before installation. The mounting holes in the block are not threaded. The B&S mounting bolts are meant to be self tapping/self threading. It is awfully difficult to do that laying underneath the mower. I would also not advise running these in with the impact wrench unless you really know what you are doing and are careful. It would be too easy to snap a bolt or strip the threads (that you just made). You could alternatively use a regular bolt with lock nuts, but these are not provided so plan ahead. The mounting hole diameter is 3/8ths inch. Also the documentation that comes with this engine doesn't cover installation at all. There are a few little plastic stops and metal screws that you need to remove before the throttle and choke will work. I kind of had to figure this out by trial and error. On the throttle body, where you connect the throttle cable, there is a small screw in a hole marked "R". You have to remove that to enable the automatic choke to work. Otherwise you will not get a full throw on your throttle lever. Don't forget to fill it with oil. You need 48 ounces of oil (also doesn't come with the engine). Once I oiled it up, she fired over on the second try. Overall it was a decent way to go versus rebuilding the old engine which broke a connecting rod. Other than some of the old hardware (bolts and muffler) and oil, this engine comes with everything you need. It has a new starter, fuel filter, air filter, etc. I would give it 5 starts if it came with better instructions, the mounting hardware, and the oil.

I used this engine to replace an 18.5 HP Briggs and Stratton on a YTH18542 Husqvarna lawn tractor. It was a exact fit no modification needed. And the shipping was much faster than other companies couldn't deliver the order. I mean days as compared to weeks. Have about 6 hours on the engine and it is running beautifully.

This engine was an excellent drop-in replacement for my John Deere D110 lawn tractor. I'm no mechanic, but with the help of some excellent Youtube videos I was able to remove the old engine and replace it with this one. Delivery of the engine was shockingly fast, I got it only a couple of days after ordering it. I'm on my second mowing season with the new engine and it's running great. No issues and very satisfied with this purchase.

Perfect fit for my riding mower.

Drop in, plug n play!! I purchased this engine to replace an 8 yr old Briggs that had seized. self tapping base was not an issue and gas lines connected accordingly. I connected the battery cable to the starter, topped the oil, and turn the key. Started right up and no carb adjustments needed. Everything was ready to go in less than 40 minutes since I had already removed the bad engine. We were moving the lawn the in less than an hour from when I took it out of the box.