Water Pump Impeller Replacement Repair Kit 150-300hp 61A-W0078-A2/A3

This impeller looks identical to the Yamaha original, but I assure you it is not. I had two of them fail in a row. Both similar to another reviewer where the drive shaft spun lose of the keyway. I thought I had done something wrong and replaced the first failed impeller with another impeller from this same provider. That failed last week after only about 30 hours. In the second failure (picture attached), it not only spun lose from the shaft, it pretty much disintegrated. Both times, the impeller had less than 50 hours on it and failed at full speed on plane. I just replaced the second one with a Yamaha OEM part and even though they look identical, you can tell very quickly they are not. This aftermarket one is MUCH firmer on the fins. That means it will create a substantially higher amount of friction and eventually cause the unit to fail. For the small price difference do yourself a favor and just buy the Yamaha impeller.

We bought this online to replace our impeller kit/water pump for out Yamaha 200HP four-stroke outboard. The impeller failed less than 15 hours into the replacement. We ended up going directly to a Yamaha dealer parts department to buy a kit to fix it after the one we bought on Amazon failed. The impeller bought on Amazon was more rigid as the Yamaha part bought directly from a dealer had a smoother texture. See photograph of failed impeller. I would advise any boater to research buying any parts online vs. from an authorized dealer, depending on the part. An impeller is vital in boat operation so don't skimp. I wouldn't wish having to be towed to shore on anyone.

DO NOT BUY FROM THIS COMPANY. Absolute junk. Bought two. One was smoked after 5 hours of run time. The second one lasted under 4 minutes. The inside of the impeller is a very soft rubber and the woodruff key quickly rounded out the impeller's slot. I've done a half dozen impellers on this motor with zero prior issues. Both of these kits were ordered at the same time and probably came from the same cheap, substandard lot.

Because of the way the item description is written I thought I was purchasing a Sierra 18-3396-1 (that is what I searched for and it is listed in the title) After receiving it and double checking I now see it says in the smaller print description that it "also fits" 18-3396-1. This item would probably work but it appears to be lower quality than the Sierra item I thought I was purchasing. The impeller has no metal core - just the rubber with a slot for the keyway. The bolts also appear to be steel (they stick to a magnet - the sierra kit includes stainless which do not) If I were to choose to use it I would certainly use the old bolts. I will be returning this item - hope this info may save someone else some time.

The impeller is harder than most. I installed anyway and it broke apart in pieces. I had to take it to have the pieces removed since they were sucked up into the engine. I would not recommend this purchase. Quality: No good quality.