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Discussion Starter #1
My question essentially is loudness difference between a Kawasaki 22hp EFI, and a Yanmar 24hp Diesel? Seems like the Yanmar is much louder than the Kawasaki. Yes, this is my first diesel, so all is new to me. I have tried to watch YouTube videos, but still can’t get a good answer to my question.


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Not really an answer to your question but my take would be that it will not matter much it at all once you engage the deck to mow-that’s where the majority of your noise will come from-doubt you’d hear either engine over it while mowing-especially if you ( and you really should be) wearing ear protection.
 

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Discussion Starter #3
Not really an answer to your question but my take would be that it will not matter much it at all once you engage the deck to mow-that’s where the majority of your noise will come from-doubt you’d hear either engine over it while mowing-especially if you ( and you really should be) wearing ear protection.
To me the Yanmar seems louder. I will try to post a video.


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A lot will depend on the type of muffler and the condition of the muffler. When run at WOT both will be very similar although the Yanmar diesel makes more of a loud hum. It's a good idea to wear a pair of ear muffs when running either for prolonged periods.
 

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I measured mine with a phone decibel meter app and it's about 2-3 dbs louder, which is significant (1025R vs X590).
 

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Discussion Starter #6
I measured mine with a phone decibel meter app and it's about 2-3 dbs louder, which is significant (1025R vs X590).
That’s a good idea. I will download a decibel meter app now, and post the results. I will test at idle, full throttle, and full throttle with deck engaged.


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Its definitely louder at idle. I have an x738 and will be trading it in on an x758 and the noise level is very noticeable. Maybe until full throttle it is not noticeable however.
 

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Discussion Starter #8
Its definitely louder at idle. I have an x738 and will be trading it in on an x758 and the noise level is very noticeable. Maybe until full throttle it is not noticeable however.


1 minute average Kawasaki 22hp EFI without deck engaged. This was taken from the seat.



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Discussion Starter #9


1 minute average Kawasaki 22hp EFI without deck engaged. This was taken from the seat.



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Correction. The higher decibel was with the deck engaged. 101db with, 98 without. Full throttle Kawasaki 22hp EFI on John Deere 445 60” deck.



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Correction. The higher decibel was with the deck engaged. 101db with, 98 without. Full throttle Kawasaki 22hp EFI on John Deere 445 60” deck.



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A man's diesel is supposed to be loud. No matter what decible, will always choose diesel. Neighbor has kowasaki, and takes 5 gal to cut his lawn. I can do mine 3 times same fuel amount.

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Discussion Starter #11
A man's diesel is supposed to be loud. No matter what decible, will always choose diesel. Neighbor has kowasaki, and takes 5 gal to cut his lawn. I can do mine 3 times same fuel amount.

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I know it suppose to be louder, and I’m really liking the diesel thus far, just have a lot of questions, exciting to learn about new things. I agree. My 445 is thirsty!!!


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Discussion Starter #12
A man's diesel is supposed to be loud. No matter what decible, will always choose diesel. Neighbor has kowasaki, and takes 5 gal to cut his lawn. I can do mine 3 times same fuel amount.

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I know it suppose to be louder, and I’m really liking the diesel thus far, just have a lot of questions, exciting to learn about new things. I agree. My 445 is thirsty!!!


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When I was shopping for my tractor I was undecided upon the X738 and the X758. I had a dealer let me take the x758 for a spin and it was great. I knew from the start it was a little loud but I don't mind throwing earplugs in, at the end of the day it's a diesel :)

He then brought the X738 out from the shop and before he could get it on the front lawn to demo I had already made my mind up. The Kawi to me sounded louder only due to it having a high pitch tone. The yanmar is deeper, but the Kawi is more piercing to hear. Think 2 stroke dirt bike vs 4 stroke.
 
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