Kenny

kpiper
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AZ US
4/21/2024 10:10am
kpiper wrote:
Had a shock shaft completely break at the bottom once. Just snapped. Sure hope Kenny comes back quickly. He was putting it to Jett. That was...

Had a shock shaft completely break at the bottom once. Just snapped. Sure hope Kenny comes back quickly. He was putting it to Jett. That was amazing to see.

lumpy790 wrote:

Happened on my 1985 500CR and dislocated my shoulder when I landed.

mine was Honda as well.

wfopete
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Dover, AR US
4/21/2024 11:11am
UGOTBIT wrote:
Can see the circlip from the shock in this picture MXA posted 

Can see the circlip from the shock in this picture MXA posted 

AI generated?

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Harv379
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4/21/2024 12:45pm

Wasn't his shock leaking fluid a couple weeks ago? Sucks it finally let go costing him. He was ripping. 

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VRR7
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4/21/2024 4:06pm

KR too fast for the Suzuki 

 

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The Shop

VRR7
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4/21/2024 4:11pm
Definitely stressed something.

Definitely stressed something.

What do you think KR was thinking ?   Cleary he did not know or see the smoke behind him. 

Must have been wondering whisky tango foxtrot ?????  

4/21/2024 4:14pm
Definitely stressed something.

Definitely stressed something.

VRR7 wrote:
What do you think KR was thinking ?   Cleary he did not know or see the smoke behind him.  Must have been wondering whisky tango foxtrot...

What do you think KR was thinking ?   Cleary he did not know or see the smoke behind him. 

Must have been wondering whisky tango foxtrot ?????  

Weege made a good point on the broadcast. Watching on TV we all clearly see a problem. But Kenny on the bike doesn't necessarily see the smoke as it's behind him

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bigcat
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N, TX US
4/21/2024 4:21pm
filterq wrote:
Might be done with HEP after this.

Might be done with HEP after this.

Zycki11 wrote:

That has zero to do with HEP. Come back stronger posting 

Really!!  Zero? It’s their team, but they are not responsible?  Come back better next time!!😉

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Zycki11
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4/21/2024 4:36pm
filterq wrote:
Might be done with HEP after this.

Might be done with HEP after this.

Zycki11 wrote:

That has zero to do with HEP. Come back stronger posting 

bigcat wrote:

Really!!  Zero? It’s their team, but they are not responsible?  Come back better next time!!😉

The team assembles the bike from suppliers that are sponsors including suspension. In this case Showa. Kenny runs factory Showa components for SX, the Showa tech and the suspension tech build the shock. If the shock failed due to part failure it isn’t HEPs fault. If HEP was running longer hours than they should before being rebuilt(zero chance) or human error during assembly HEP would be at fault. It’s racing and things happen. Ricky broke a shock collar in 06 in STL. Dungey blew out his air shock testing it during supercross. Eli had his valve cover start to leak this year at Daytona. It’s a nothing move on 

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aeffertz
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La Crosse, WI US
4/21/2024 4:58pm
Harv379 wrote:

Wasn't his shock leaking fluid a couple weeks ago? Sucks it finally let go costing him. He was ripping. 

I believe you’re thinking about when he came into contact with another rider and it caused a coolant leak. His bike started pouring out coolant and he almost went over the bars because the coolant was spraying all over his bike which made it slippery and he lost grip. 

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GH28
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Santa Barbara, CA US
4/21/2024 8:50pm

Anyone know yet if it was the shock main body that failed or the bladder cap?

I'm guessing the bladder cap for two reasons.  1, the smoke showed up very acutely when he landed, so it dumped a bunch onto the exhaust pipe right on that compression.  It seems like it wouldn't be as direct if it were the main body.  2, saw some picture floating around with a circlip floating off the side of the bike.  Could be a BS picture, but it seems really difficult for a circlip to completely separate from the rest of the shaft assembly.  Nothing to keep the bladder circlip captive.

Just speculating.  Shocks can get hot enough and expand the fluid enough to nearly eat up the available bladder volume, especially with a gnarly bottom-out like that.  I've had that happen in races before where the bladders get some super nasty behavior after an hour or so of rough terrain.  Always wondered just how much they could take before something gives.

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4/21/2024 9:07pm Edited Date/Time 4/21/2024 9:07pm
GH28 wrote:
Anyone know yet if it was the shock main body that failed or the bladder cap? I'm guessing the bladder cap for two reasons.  1, the...

Anyone know yet if it was the shock main body that failed or the bladder cap?

I'm guessing the bladder cap for two reasons.  1, the smoke showed up very acutely when he landed, so it dumped a bunch onto the exhaust pipe right on that compression.  It seems like it wouldn't be as direct if it were the main body.  2, saw some picture floating around with a circlip floating off the side of the bike.  Could be a BS picture, but it seems really difficult for a circlip to completely separate from the rest of the shaft assembly.  Nothing to keep the bladder circlip captive.

Just speculating.  Shocks can get hot enough and expand the fluid enough to nearly eat up the available bladder volume, especially with a gnarly bottom-out like that.  I've had that happen in races before where the bladders get some super nasty behavior after an hour or so of rough terrain.  Always wondered just how much they could take before something gives.

Kenny's description is ambiguous, it may have been the bladder cap or it may have been the the rubber stopper smashing into the end plate, I'd wait for pictures, @ML512 Pit Bits maybe?

image-20240422140306-1

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PTshox
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4/21/2024 9:36pm

His reply points to the body failing ... cracking etc... the main part the shaft slides into. Not a seal. That's super unusual. 

 

He certainly was ripping. Bummer. 

1
bvm111
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4/21/2024 10:31pm

I will be surprised is we ever actually find out what happened … this is MX and everything is a secret. 

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4/21/2024 10:36pm
bvm111 wrote:

I will be surprised is we ever actually find out what happened … this is MX and everything is a secret. 

Same honestly, I love how Ricky said no one likes to keep secrets in this sport or something like that on the broadcast when in reality, its the complete opposite unfortunately. I doubt we will ever know how haiden broke his wrist and how he was preparing for this season. That would be cool though if they had videos during that time and they release them. Again, I highly doubt those will ever see the light of day.

VRR7
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4/21/2024 11:49pm
 

 

VRR7
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4/22/2024 12:11am

image-20240422091131-1

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4/22/2024 12:19am
VRR7 wrote:

image-20240422091131-1

Compression adjuster looks intact!

OldTech
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Decatur , AL US
4/22/2024 6:02am

The clip surely had to come from the bladder or the whole thing would have come apart. Amazing he rode it as long as he did 

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VRR7
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4/22/2024 6:27am

Bottom cap thingy ???  


Product main image

VRR7
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4/22/2024 6:31am

So the bladder was not bleeding enough ?   Bottom cap thing below - 9   

MXA pic :-) 




8tensolutions
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4/22/2024 7:47am
bvm111 wrote:

I will be surprised is we ever actually find out what happened … this is MX and everything is a secret. 

Matthes reported the reservoir portion failed and basically exploded.  Showa is not sure what caused it and looking into it.  Sounds like a secret to me lol.

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StillSmokin
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4/22/2024 8:05am

ktm floating piston FTW, again

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StillSmokin
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4/22/2024 8:06am
bvm111 wrote:

I will be surprised is we ever actually find out what happened … this is MX and everything is a secret. 

Matthes reported the reservoir portion failed and basically exploded.  Showa is not sure what caused it and looking into it.  Sounds like a secret to me...

Matthes reported the reservoir portion failed and basically exploded.  Showa is not sure what caused it and looking into it.  Sounds like a secret to me lol.

Cavitation

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GH28
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4/22/2024 8:35am
bvm111 wrote:

I will be surprised is we ever actually find out what happened … this is MX and everything is a secret. 

Matthes reported the reservoir portion failed and basically exploded.  Showa is not sure what caused it and looking into it.  Sounds like a secret to me...

Matthes reported the reservoir portion failed and basically exploded.  Showa is not sure what caused it and looking into it.  Sounds like a secret to me lol.

Cavitation

More like the opposite.

Shaft displaces ~20cc into the bladder volume.  I ran some calcs on it a while back and the thermal expansion of the fluid at working temperatures was something like 40cc in a normal rear shock.  I forget what the total volume of a normal bladder is, but it can't be more than 100cc, maybe closer to 50-60cc.  So if the shock is slightly overfilled or the bladder is slightly collapsed when it's assembled, that pneumatic chamber can cause some insane pressures when the volume runs out.  Which might happen if it was assembled cold, slightly overfilled/underinflated bladder, Kenny really pushed it on the first few laps (or the exhaust pipe was running extra hot next to it) and there was a true full-cycle to the shock (landing that triple).

I think that condition is pretty common with people generally heating up shocks, but we're just not able to generate the kind of force to cycle it all the way like KR landing a SX triple at race pace.  It just acts like a really aggressive spring and people might notice the shock acting funny.

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4/22/2024 9:55am

I only just noticed Kenny wearing the wrist braces. Has he been wearing those ever since his arm injuries?

4/22/2024 12:27pm

I only just noticed Kenny wearing the wrist braces. Has he been wearing those ever since his arm injuries?

I think so.

4/22/2024 2:11pm

I wonder how much the 9 whoop rule helped  or hurt Kenny in this crash?  It was spectacular how well he got himself out of it. The way the bike is flipping beside him.  I never like to watch crash videos over, but there is so much going on in this one. Crazy stuff. 

 I really hope  he is OK.

Some amazing photos and video , that has got to be one of the most spectacular crashes in Supercross of all time. 

It would be interesting to hear details about how it failed and see some photos of the shock, and it taken apart. That crash footage will be played over and over. And everybody and their brother will be speculating on the cause .  I think that being as open and honest about what went wrong as they can be , would be a great PR move. So people are able to sift through the speculation and find some details from the team.  

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w1ked
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Peabody, MA US
4/22/2024 3:47pm
ForToo wrote:

Did anyone else catch that he doubled (where Sexton crashed) right before blowing his shock out?

I didn't but now that you pointed that out i went back and watched the main.... tomac doubles it as well a couple of laps before that

4/22/2024 3:49pm
ForToo wrote:

Did anyone else catch that he doubled (where Sexton crashed) right before blowing his shock out?

w1ked wrote:
I didn't but now that you pointed that out i went back and watched the main.... tomac doubles it as well a couple of laps before...

I didn't but now that you pointed that out i went back and watched the main.... tomac doubles it as well a couple of laps before that

That was wild! Eli and Ken sent it

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defeatist45
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Raleigh, NC US
4/22/2024 5:26pm
I don't recall there ever being a shock failure that caused smoke or anything close to this and I have been riding/watching for more than 30...

I don't recall there ever being a shock failure that caused smoke or anything close to this and I have been riding/watching for more than 30 years.  RC calling Eli's shock at Daytona was comical, but this one appears to actually be the shock.,  I hope we hear more details, but we all know we won't.....just like a rock hit Sexton's throttle body lol.

Charlotte in 98 I saw it in a heat or lcq over the finish line. Only time I have ever seen it. No idea who it was.

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