2024 Kawasaki KX450 and KX450X

Golfnut721
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38
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8/31/2024
Location
HELTONVILLE, IN US
11/16/2025 9:03am Edited Date/Time 11/16/2025 9:04am

Gonna need to drain that oil to know more. See what’s in it. 

IMG 2878 0Lots of copper.

crmx105
Posts
621
Joined
5/7/2016
Location
Dunnellon, FL US
11/16/2025 5:01pm

Gonna need to drain that oil to know more. See what’s in it. 

Golfnut721 wrote:
Lots of copper.

IMG 2878 0Lots of copper.

Looking like bad lower rod bearing?

1
11/17/2025 4:13am

Gonna need to drain that oil to know more. See what’s in it. 

Golfnut721 wrote:
Lots of copper.

IMG 2878 0Lots of copper.

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and see if they will help you.  I had a buddy that had a fuel pump go bad at 23 hours on his 2023, and Kawasaki paid to replace it.  This was only a couple months ago, so the bike was over 2 years old at the time.

The Shop

Golfnut721
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38
Joined
8/31/2024
Location
HELTONVILLE, IN US
11/17/2025 5:06am
If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and...

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and see if they will help you.  I had a buddy that had a fuel pump go bad at 23 hours on his 2023, and Kawasaki paid to replace it.  This was only a couple months ago, so the bike was over 2 years old at the time.

That’s my first call of the day. Not counting on anything but hopeful.  

alycium102
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145
Joined
11/14/2017
Location
USA, MN US
11/18/2025 3:03am

Gonna need to drain that oil to know more. See what’s in it. 

Golfnut721 wrote:
Lots of copper.

IMG 2878 0Lots of copper.

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and...

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and see if they will help you.  I had a buddy that had a fuel pump go bad at 23 hours on his 2023, and Kawasaki paid to replace it.  This was only a couple months ago, so the bike was over 2 years old at the time.

There was a recall on certain fuel pumps though as well. I had a 22 sr and at the end of 2023 the dealership contacted me about the fuel pump and they replaced it at no charge. So it very well could be a matching number situation on that one. 

11/18/2025 3:51am Edited Date/Time 11/18/2025 3:53am
Golfnut721 wrote:
Lots of copper.

IMG 2878 0Lots of copper.

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and...

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and see if they will help you.  I had a buddy that had a fuel pump go bad at 23 hours on his 2023, and Kawasaki paid to replace it.  This was only a couple months ago, so the bike was over 2 years old at the time.

alycium102 wrote:
There was a recall on certain fuel pumps though as well. I had a 22 sr and at the end of 2023 the dealership contacted me...

There was a recall on certain fuel pumps though as well. I had a 22 sr and at the end of 2023 the dealership contacted me about the fuel pump and they replaced it at no charge. So it very well could be a matching number situation on that one. 

The fuel pump recall was on the 2022 model year only.  My buddy’s was not part of the recall.  The dealer said they replaced it through a “good will” program.  Kawasaki paid to have the problem diagnosed, and when it was confirmed that the fuel pump was the issue, they went ahead and took care of it.

1
DB505
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728
Joined
12/5/2013
Location
Rowlett, TX US
11/19/2025 4:05pm

Will a 19/23, rear shock fit on 24/26?

crc245
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1326
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10/29/2007
Location
Yorba Linda, CA US
11/19/2025 4:51pm
DB505 wrote:

Will a 19/23, rear shock fit on 24/26?

No, I don’t believe so - New (24’+ 450, 25’+ 250) shock is significantly shorter due to frame/swingarm/linkage changes

11/19/2025 4:52pm
DB505 wrote:

Will a 19/23, rear shock fit on 24/26?

crc245 wrote:

No, I don’t believe so - New (24’+ 450, 25’+ 250) shock is significantly shorter due to frame/swingarm/linkage changes

This is correct.

DB505
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728
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12/5/2013
Location
Rowlett, TX US
11/19/2025 5:02pm

Thanks

crmx105
Posts
621
Joined
5/7/2016
Location
Dunnellon, FL US
11/19/2025 7:07pm
DB505 wrote:

Thanks

Might just be the clevis?

11/20/2025 8:07am
DB505 wrote:

Thanks

crmx105 wrote:

Might just be the clevis?

The reservoir is on the opposite side too 

gscx
Posts
186
Joined
4/27/2018
Location
Schenectady, NY US
11/20/2025 8:26am
DB505 wrote:

Thanks

crmx105 wrote:

Might just be the clevis?

If you change the shock shaft, clevis and body over to the 25 it will fit.

Let us know how it goes.

12/15/2025 12:51pm

I believe maxima has pro filters for our bikes now. The sku is afr-3002-03 and is $15

2
12/17/2025 7:07pm

This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours on it running Maxima Premium oil with oil changes every other ride. I asked Hinson for a discount for the replacement parts since the bike is still so new.. but no luck.

IMG 1555 1
fiddy
Posts
38
Joined
3/24/2014
Location
NJ US
12/17/2025 7:23pm

I broke a lot of plates on mine.Went to a2019 Hinson full system with springs and clutch is lasting and not breaking.

crmx105
Posts
621
Joined
5/7/2016
Location
Dunnellon, FL US
12/17/2025 7:31pm
motoxxx599 wrote:
This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours...

This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours on it running Maxima Premium oil with oil changes every other ride. I asked Hinson for a discount for the replacement parts since the bike is still so new.. but no luck.

IMG 1555 1

Hub or basket is grooved? The hub and basket are Hinson? 20 hrs not much time?

1
NicNak
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1003
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2/18/2019
Location
Palm Desert, CA US
12/17/2025 8:49pm Edited Date/Time 12/17/2025 8:52pm
motoxxx599 wrote:
This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours...

This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours on it running Maxima Premium oil with oil changes every other ride. I asked Hinson for a discount for the replacement parts since the bike is still so new.. but no luck.

IMG 1555 1
crmx105 wrote:

Hub or basket is grooved? The hub and basket are Hinson? 20 hrs not much time?

That thing looks cooked for sure. From my understanding they break from overheating. So even if it still measures in spec it’s shot cause it’s brittle. Also, the material on the fiber gets burnt off so it doesn’t grab near as good. 


What kind of racing are you doing ? 

I run a full Hinson set up & it significantly improved my clutch life. 20w-50 mineral based oil - maxima 

Just regular single spring set up. Basket, hub. I’ve put quite a bit of time on the basket & hubs & they don’t seem to groove like the OEM ones. You grooved up a Hinson inner hub in 20 hours ?

1
12/18/2025 4:14am
motoxxx599 wrote:
This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours...

This is the bottom fiber. Running a full Hinson setup with Hinson fibers and steels. The hub is grooved pretty deep also. Bike has 20 hours on it running Maxima Premium oil with oil changes every other ride. I asked Hinson for a discount for the replacement parts since the bike is still so new.. but no luck.

IMG 1555 1

You killed a Hinson clutch in 20 hours?!?  I didn’t know Eli Tomac posted on Vital.

5
motomike894
Posts
1571
Joined
9/6/2009
Location
Waterloo, IN US
12/18/2025 6:15am

I have heard and seen of clutch plates breaking on the newer Kx's. 

Has yet to happen to me, and trust me at times I am hammering that baby lol. 

I have had oem and hinson fibers both fine. 

But I got a new 25 I have only ridden once so far and I will be keeping close eye on the clutch. 

2
crmx105
Posts
621
Joined
5/7/2016
Location
Dunnellon, FL US
12/22/2025 3:43pm

Highly recommend the Tusk Quick Draw filter system .  Still has the slide in base plate that has a rubber sealing gasket on it. The filter cage attaches to the base plate with a center bolt like a typical filter set up. The base plate and cage are aluminum. Half the price of the Power Flow and no need to disassemble the air box. Who ever designed it did a great job! You have to wiggle the base plate up and down a tad to get it to slide in far enough to clip in. Just did my first filter change with it and the sealing surface on the air box was very clean after sliding the filter assembly out. MUCH better than the stock set up!!!!!!!

4
MXer391
Posts
419
Joined
2/10/2014
Location
Altoona, PA US
12/23/2025 8:49am
crmx105 wrote:
Highly recommend the Tusk Quick Draw filter system .  Still has the slide in base plate that has a rubber sealing gasket on it. The filter...

Highly recommend the Tusk Quick Draw filter system .  Still has the slide in base plate that has a rubber sealing gasket on it. The filter cage attaches to the base plate with a center bolt like a typical filter set up. The base plate and cage are aluminum. Half the price of the Power Flow and no need to disassemble the air box. Who ever designed it did a great job! You have to wiggle the base plate up and down a tad to get it to slide in far enough to clip in. Just did my first filter change with it and the sealing surface on the air box was very clean after sliding the filter assembly out. MUCH better than the stock set up!!!!!!!

Thanks for recommending this. I have been thinking about going with either the Twin Air Powerflow Kit or the Williams Motorwerx system but this may be a good alternative. I haven't had any sealing issues with the stock system and Twin Air filters but they are a pain to change. 

 

What is the quality like of the Tusk filters? I have always been hesitant to use anything other than Twin Air or OEM.

crmx105
Posts
621
Joined
5/7/2016
Location
Dunnellon, FL US
12/23/2025 5:01pm
crmx105 wrote:
Highly recommend the Tusk Quick Draw filter system .  Still has the slide in base plate that has a rubber sealing gasket on it. The filter...

Highly recommend the Tusk Quick Draw filter system .  Still has the slide in base plate that has a rubber sealing gasket on it. The filter cage attaches to the base plate with a center bolt like a typical filter set up. The base plate and cage are aluminum. Half the price of the Power Flow and no need to disassemble the air box. Who ever designed it did a great job! You have to wiggle the base plate up and down a tad to get it to slide in far enough to clip in. Just did my first filter change with it and the sealing surface on the air box was very clean after sliding the filter assembly out. MUCH better than the stock set up!!!!!!!

MXer391 wrote:
Thanks for recommending this. I have been thinking about going with either the Twin Air Powerflow Kit or the Williams Motorwerx system but this may be...

Thanks for recommending this. I have been thinking about going with either the Twin Air Powerflow Kit or the Williams Motorwerx system but this may be a good alternative. I haven't had any sealing issues with the stock system and Twin Air filters but they are a pain to change. 

 

What is the quality like of the Tusk filters? I have always been hesitant to use anything other than Twin Air or OEM.

Tusk filter seems pretty good, they are 3 layered. The rubber grommet is very similar to a Twin Air. The Grommet did flatten out on the post a bit so added a flat washer to the filter bolt. If that doesn't work will try a Twin Air grommet and see if it is a little more stout. Probably due to me tightening it down to much so maybe the washer may do the trick? Other than that def much better than the stock system. I was running Twin Airs with a domed cage and on one of the filters the part you fold over and hook on the cage ripped and started seeing little tears in the filters I think were from when putting the two piece cage together? The Rocky Mtn sight has really good pics of it once you put your bike info in when ordering it. 

MXer391
Posts
419
Joined
2/10/2014
Location
Altoona, PA US
1/2/2026 9:16am

Shout out for the Williams Motorwerx airbox kit. It uses a larger surface area '17-'18 Honda CRF 250 air filter and a tradition style cage that screws in, which I really like. Installs similar to the Twin Air Powerflow kit as you have to change the base plate. Excellent customer service too. Jesse has been very helpful with answering any questions I have. I'm pretty sure this system is what the Partzilla Kawasaki and the Canadian Kawasaki Race Team are using. I am going to trim the airbox open while I have it apart. Will report back with some seat of the pants finding whenever I can get to ride the thing here in the Northeast. 

3
1/2/2026 10:02am
If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and...

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and see if they will help you.  I had a buddy that had a fuel pump go bad at 23 hours on his 2023, and Kawasaki paid to replace it.  This was only a couple months ago, so the bike was over 2 years old at the time.

Golfnut721 wrote:

That’s my first call of the day. Not counting on anything but hopeful.  

So what did they tell you when you called?

Golfnut721
Posts
38
Joined
8/31/2024
Location
HELTONVILLE, IN US
1/2/2026 10:22am
If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and...

If it was my bike and I had a rod bearing go out with 20 hours on a bike, I’d call Kawasaki’s customer care line and see if they will help you.  I had a buddy that had a fuel pump go bad at 23 hours on his 2023, and Kawasaki paid to replace it.  This was only a couple months ago, so the bike was over 2 years old at the time.

Golfnut721 wrote:

That’s my first call of the day. Not counting on anything but hopeful.  

So what did they tell you when you called?

They started with the normal Motocross bikes have zero warranty but they opened a log number up. I took it to the local dealer they took it apart and got with Kawasaki and they scanned the ecu, and come to find out it only had 10 hours on it, the person who installed the hour meter put it in the wrong setting. After some time they got back with me and Kawasaki is going to cover the crank only. So they did help out a bit but still going to be $2000 in parts and labor. So in about a weeks time Ill have a 2024 with an almost brand new motor, new piston, cylinder, oil pump, crank, etc.

1
1/2/2026 11:18am

When these bikes sit for a few days without running, the oil drains down from oil passages. It's the "dry" starts that hurt the plain bearing rods over time.

Hold kill button down, press start button for 5 seconds, then release kill button. This builds oil pressure before starting. 

 

5
connerg461
Posts
13
Joined
3/21/2023
Location
Fort Wayne , IN US
1/25/2026 7:52pm

Wanted to see what some people on here thought about this. I was replacing the counter shaft seal on my 24 KX450 (64 hours). The collar ended up being seized and impossible to remove so I drilled a hole in the counter shaft seal and ran a screw into the hole so I could pull the screw and pull the CS seal out. I was able to get the CS seal out but I f’d up and ended up running the screw too deep and poked the seal of the bearing that sits just behind CS seal. Just trying to figure out if this is  a major issue or if I should I run it and see what happens. I’ve noticed that other brands don’t have a sealed bearing so I’m curious why Kawi has a sealed bearing there. Any input is much appreciated. Thank youIMG 0857 2.jpeg?VersionId=jPtNejOpDt90tHzdIMG 0858 5IMG 0859 0.png?VersionId=5pgIbLZ96kfRJkDzzgvguByH97

1/25/2026 9:26pm
connerg461 wrote:
Wanted to see what some people on here thought about this. I was replacing the counter shaft seal on my 24 KX450 (64 hours). The collar...

Wanted to see what some people on here thought about this. I was replacing the counter shaft seal on my 24 KX450 (64 hours). The collar ended up being seized and impossible to remove so I drilled a hole in the counter shaft seal and ran a screw into the hole so I could pull the screw and pull the CS seal out. I was able to get the CS seal out but I f’d up and ended up running the screw too deep and poked the seal of the bearing that sits just behind CS seal. Just trying to figure out if this is  a major issue or if I should I run it and see what happens. I’ve noticed that other brands don’t have a sealed bearing so I’m curious why Kawi has a sealed bearing there. Any input is much appreciated. Thank youIMG 0857 2.jpeg?VersionId=jPtNejOpDt90tHzdIMG 0858 5IMG 0859 0.png?VersionId=5pgIbLZ96kfRJkDzzgvguByH97

I’m sure it would be fine. The collar wasn’t seized if it removed easily once the seal was gone. It is a major pita to get out. Takes a lot of wiggles with channel locks and patience sometimes. 

3

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