yamaha 824 engine in bad boy rogue

[FixItFrank]

I have a Bad boy rogue with the 824 yamaha engine last year i had an oil pump that started leaking and had to be replaced. This season my second cutting the mower quit running so i hauiled it back to the local dealer. they determined that the two intake valves seized in the head. The dealer was able to get one head off fine but the other head had one head bolt that was also seized in the head. They were finally able to get the head bolt out without breaking but its ruined the threads in the head and they say the factory said it has ruined the head beyond repair and the motor has to be replaced. they cannot even get the valves out of the heads.
at this point the yamaha factory takes no responsibility for the issues with the engine and leaves me with the decision to replace the engine with something else beside Yamaha. I will never purchase another Yamaha engine and probably not a Bad boy mower.
Has anyone else had issues with the 824 Yamaha engine?

That’s rough.I’ve heard of a few guys having issues with the Yamaha 824s, mostly around valve seizure and poor oil flow, especially if the motor runs hot or has long intervals between oil changes. But seized head bolts and completely trashed heads? That’s next level.
Sucks that Yamaha won’t stand behind it, especially with such low hours. You’re not the first I’ve seen swearing off both Yamaha engines and Bad Boy mowers after something like this.If you end up swapping, a lot of folks have had better luck dropping in a Kawasaki FX or Briggs Vanguard.

 

[MParr]

That’s rough.I’ve heard of a few guys having issues with the Yamaha 824s, mostly around valve seizure and poor oil flow, especially if the motor runs hot or has long intervals between oil changes. But seized head bolts and completely trashed heads? That’s next level.
Sucks that Yamaha won’t stand behind it, especially with such low hours. You’re not the first I’ve seen swearing off both Yamaha engines and Bad Boy mowers after something like this.If you end up swapping, a lot of folks have had better luck dropping in a Kawasaki FX or Briggs Vanguard.

Bad Boy, just like some other manufacturers, got fooled by Yamaha's marketing game and reputation. These engines were not what they were made out to be. These were old Subaru designs that were made in China. They had 3 valves per cylinder and hemisphere heads. The valves could not be adjusted by traditional means. Shim buckets had to be used.

 

[FixItFrank]

Bad Boy, just like some other manufacturers, got fooled by Yamaha's marketing game and reputation. These engines were not what they were made out to be. These were old Subaru designs that were made in China. They had 3 valves per cylinder and hemisphere heads. The valves could not be adjusted by traditional means. Shim buckets had to be used.

So it is like this.