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Discussion Starter #1
Hello, new guy here. Sorry for the long post. I have a 2018 Honda Grom SF with 651 miles.


This week I installed a Kitaco Clutch Cover, along with a Takegawa Super Oil Pump, Hard Racing Billet Clutch Plate, and EBC Clutch Springs. Running Motul 300V 10w40 Oil. The install went well. I followed the instructions exactly. Every bolt was torqued to spec. Clutch Springs were seated properly. Clutch free play was adjusted as needed. No surprises.


Afterwards, while riding the bike I heard what sounded sort of like a whistling/jet engine sound. Not super loud, but noticeable. The sound is only heard when the clutch is engaged and becomes louder as the rpms climb. If you pull in the clutch lever, the sound disappears, even while revving the engine.


Today, I was able to ride the bike on my street with no helmet, so I could better hear what was going on. The noise sounds like a gear whine sound. I don’t remember the bike making this sound previously.


Two things I observed during the install.


1. The drive gear on the Takegawa Super Oil had what felt like lots of slop to it. Like it wobbled and sounded like it would rub the back of the oil pump itself. I’m not sure if this is normal for these pumps, but I wasn’t left super impressed.


2. The bearing in the Hard Racing Clutch Plate fit very loosely. You could spin the entire bearing in it’s slot. The same bearing also fit pretty loosely in the stock plate too.


I don’t think the oil pump would cause this noise, because it is always spinning regardless of whether or not the clutch is engaged. Maybe the clutch plate bearing could make this noise? Could a gear be damaged?


Any thoughts? Do any of you have a similar sound from your bikes? Is it normal?

Reply #9 in this thread, the person talks of a similar sound after installing the Kitaco Clutch Cover. Describes it as a turbo spooling up.

https://www.hondagrom.net/forums/7-grom-talk/43044-new-grom-report-usfs-exhaust-recommendations-oil-spinner-question.html



I guess it concerns me.

Thanks. Any help would be greatly appreciated.
 

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For what it's worth, I installed that exact same set of parts last week. The bearing was a much tighter fit in the aftermarket clutch plate than in the stock one.

I also hear some noise but it's not too loud, I didn't think too much of it.
 

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Hello, new guy here. Sorry for the long post. I have a 2018 Honda Grom SF with 651 miles.


This week I installed a Kitaco Clutch Cover, along with a Takegawa Super Oil Pump, Hard Racing Billet Clutch Plate, and EBC Clutch Springs. Running Motul 300V 10w40 Oil. The install went well. I followed the instructions exactly. Every bolt was torqued to spec. Clutch Springs were seated properly. Clutch free play was adjusted as needed. No surprises.


Afterwards, while riding the bike I heard what sounded sort of like a whistling/jet engine sound. Not super loud, but noticeable. The sound is only heard when the clutch is engaged and becomes louder as the rpms climb. If you pull in the clutch lever, the sound disappears, even while revving the engine.


Today, I was able to ride the bike on my street with no helmet, so I could better hear what was going on. The noise sounds like a gear whine sound. I don’t remember the bike making this sound previously.


Two things I observed during the install.


1. The drive gear on the Takegawa Super Oil had what felt like lots of slop to it. Like it wobbled and sounded like it would rub the back of the oil pump itself. I’m not sure if this is normal for these pumps, but I wasn’t left super impressed.


2. The bearing in the Hard Racing Clutch Plate fit very loosely. You could spin the entire bearing in it’s slot. The same bearing also fit pretty loosely in the stock plate too.


I don’t think the oil pump would cause this noise, because it is always spinning regardless of whether or not the clutch is engaged. Maybe the clutch plate bearing could make this noise? Could a gear be damaged?


Any thoughts? Do any of you have a similar sound from your bikes? Is it normal?

Reply #9 in this thread, the person talks of a similar sound after installing the Kitaco Clutch Cover. Describes it as a turbo spooling up.

https://www.hondagrom.net/forums/7-grom-talk/43044-new-grom-report-usfs-exhaust-recommendations-oil-spinner-question.html



I guess it concerns me.

Thanks. Any help would be greatly appreciated.
I installed one of these years ago and had same noise. Oil pump flow has increased by 40% so hearing a whooshing noise is normal. Just put a loud exhaust and you'll never hear it again lol. Get a catch can and oil cooler installed and start riding it like its stolen lmao
 

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Discussion Starter #5 (Edited)
I installed one of these years ago and had same noise. Oil pump flow has increased by 40% so hearing a whooshing noise is normal. Just put a loud exhaust and you'll never hear it again lol. Get a catch can and oil cooler installed and start riding it like its stolen lmao
Thanks for the replies everyone.

I guess I’m not convinced it is the oil pump, because the pump is always spinning. This noise goes away as soon as the clutch lever is pulled in. You can then rev the motor to the moon and the noise will not be present until the clutch is released again.

I do have a loud exhaust though and agree with your advice to ride it like I stole it...lol!

#10 in that thread is your answer
Reply #10 in that thread, mentions there being more whine created by flat cut gears when there is less load on them. In my case, I think the gears or whatever seems to be quiet when the is no load and whining when the clutch lever is released and the load picks up.
 

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Reply #10 in that thread, mentions there being more whine created by flat cut gears when there is less load on them.
I hear the whine whenever I'm coasting to a stop. Sounds exactly like flat cut gears in an unloaded situation to me. I also hear the clutch basket rattling at idle. I believe that without the heavy spinner absorbing the power stokes of the engine, those little pulsing accelerations and decelerations of the crankshaft get transferred to the basket causing the clutch plates rattle.
 

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Discussion Starter #7
I don’t notice the clutch basket rattling on my bike, but it has low miles at this point, so maybe that makes a difference.

I think it is the musician in me. I am very sensitive to changes in sound. With that said, I wish I knew definitively what was causing this. I feel like something is off.

A friend suggested that maybe the Motul 300V 10w40 oil could be causing this. I’m not sure if oil could make that big of a difference in sound or not.

While I don’t think it is the oil pump causing this sound, has anyone else noticed the drive gear on their Takegawa Oil Pump rubbing up against the backside of the pump? As I stated previously, I wasn’t super impressed. Expected the Takegawa Pump to be high quality. Maybe due to the additional thickness of the pump there is less clearance?

This is the only Takegawa Oil Pump I have ever held, so I have nothing to compare it to other than the stock pump. It didn’t inspire confidence. If it fails, bad things would happen.
 

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I don’t notice the clutch basket rattling on my bike, but it has low miles at this point, so maybe that makes a difference.
Mine has over 5,000 miles. It's normal for things to loosen up and rattle a little. It's not the sound of anything breaking, just typical wear. :)
 

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You referenced my post about the noise. It still makes the noise, but I've had no issues. I think it's just as Tooter said about the gears. I have a good number of miles on it and have taken the cover off to get in there for other things and it still looks perfect. It's just a noise it makes. I wouldn't lose sleep over it.

Also I haven't noticed anything with the Takegawa oil pump. It was a tight fit when I first installed it, but that's about it. It is a quality part and I have nothing but good experiences with Takegawa.
 

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Discussion Starter #10
Hello everyone. I thought I would revisit this issue to see if anyone else had any additional thoughts about this noise.

I recently discovered this thread:
Kitaco clutch cover noises.

This person seems convinced that the noise is coming from a loose fitting bearing in the clutch lifter plate.

Cisco, also mentions in the thread that the noise could be from a marked up primary drive gear that meshes with the driven gear on the clutch basket.

So, today I removed my Kitaco Clutch Cover to install Kitaco 60% Stiffer Clutch Springs. I also thought I would install the Kitaco Clutch Lifter Plate while I was at it. I already have the Hard Racing Lifter Plate installed, but I thought I would try the Kitaco one to see if the bearing fit more snuggly. It turns out, that my bearing fits the same in all three plates that I own (stock, Hard Racing, Kitaco). Basically, the bearing will easily fall out of all three. I’m not sure if I should try a new bearing or not. The one I have is super smooth.

I used a quarter in the gears like many people recommend when I first installed my Kitaco Clutch Cover to keep the motor from turning over. I have gone over every tooth of the primary drive gear and driven gear with my finger and Q-Tips. I can’t find an imperfection on any of the teeth.

I’m not sure if there could be a slightly bent tooth that is not perceptible to the naked eye.

Do you think putting a quarter in the gears could cause a tooth to get bent? I’m not sure just how strong those gears are.

I considered just replacing both gears to satisfy my curiosity, but they are expensive. $100 for the clutch driven gear and $31 for primary drive gear.

I have wondered if everyone’s bike with a Kitaco Clutch Cover makes this noise and many of them just don’t hear it or notice.

If I knew that this was normal, I wouldn’t worry about it. It’s just a slight whine/whistling sound. I would love to figure this out. I unfortunately don’t have any fellow Gromers to compare my bike to.
 

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Mine has had whining gears since the day I put the Kitaco on... 8,500 completely trouble free miles. :)
 

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Discussion Starter #13
I’m thinking it must be normal then to have the whining sound once you install the Kitaco Clutch cover.

I was on the Grom Facebook Group one time and I remember reading a comment someone made about how the Kitaco Clutch Cover made things sound different.

I put mine back together tonight. Everything looked great.
 
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