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Discussion Starter · #1 ·
So weekend before last, I was enjoying my 2021 KRX 1000 humming along a flat gravel road at a decent clip, but below 50mph. The road went left at about 60 degrees and I leaned into the turn pretty hard and was shocked at a quick snap like flip that sent me rolling. Luckily, I escaped relatively unhurt, but the unit is pretty banged up. The ROPS is NOT a roll cage is it is the same wall thickness as exhaust tubing and folded so I have ordered a true roll cage with intrusion bars as I want to avoid further concussions.

Finally got a chance to put the machine up on a lift and was surprised by what I found and would appreciate the opinion of others. The right rear trailing arm failed, and it appears that it broke clean off at the welds but I am not a metalurgist
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Damn!! Glad to hear you weren't hurt bad but sorry about the crash. I don't know enough about these things to comment on the trailing arm. Do you have an overall pic of the machine? Just curious how it looks overall after a severe crash. Are you thinking the trailing arm failed before the crash therefore causing the crash to happen?
 

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Discussion Starter · #3 ·
It may have. I am a hobby road racer so I generally have a decent feel for car control but was surprised by how quickly it snapped over and this was the right rear trailing arm. Guess it could've snapped during the roll but not sure. In order to hopefully be allowed by my wife to continue playing, I purposefully do not have pics of the machine post crash. The entire right side of the cage crumbled and folded in on itself and sheared the A-pillar bolts out as well.
 

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2020 KRX
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IMO, that is a failure of a structural component. I don’t know enough about the situation to comment further, but I can say I’ve thrown my machine into corners at a good clip, and other then some minor oversteer, have not had anything like that happen.
It does however look like that trailing arm was not properly welded. Here is a picture of mine for comparison.
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Discussion Starter · #6 ·
I was thinking the weld did not look like it had good penetration on the right side of my picture as it did not snap the weld itself or tear the metal it was welded to.
 

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I was thinking the weld did not look like it had good penetration on the right side of my picture as it did not snap the weld itself or tear the metal it was welded to.
That’s the way I see it. I think (I’m no welder) it’s called a “cold weld”, whereas it did not properly bond to the metal.
 

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2020 Green KRX
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So weekend before last, I was enjoying my 2021 KRX 1000 humming along a flat gravel road at a decent clip, but below 50mph. The road went left at about 60 degrees and I leaned into the turn pretty hard and was shocked at a quick snap like flip that sent me rolling. Luckily, I escaped relatively unhurt, but the unit is pretty banged up. The ROPS is NOT a roll cage is it is the same wall thickness as exhaust tubing and folded so I have ordered a true roll cage with intrusion bars as I want to avoid further concussions.

Finally got a chance to put the machine up on a lift and was surprised by what I found and would appreciate the opinion of others. The right rear trailing arm failed, and it appears that it broke clean off at the welds but I am not a metalurgist View attachment 1850
Gonna have to go look at my trailing arms and make sure it has proper welds! Glad you’re ok bro.
 

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Very glad to hear that you are ok that is terrible news. I think we should all be checking this on our machines.
 

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2020 Kawasaki KRX
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It looks like the weld failed, but impossible to say if it was before or after the roll. Seems more likely that it would have happened during the roll if you slapped the right side on the ground hard enough to shear the A pillar bolts and fold up the ROPS. I would bet you hooked the right rear on something and that's what started it. I think many have the misconception thinking that the ROPS is a roll cage. It is not. Regardless, I would have the trailing arm inspected because the weld shouldn't break clean like that.
 

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It appears to be a missed weld more than a bad weld. Something wasn't jigged right and the weld is to far to the left. It maybe good idea to fish plate these, but this is the first failure I've seen.
 

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That’s the way I see it. I think (I’m no welder) it’s called a “cold weld”, whereas it did not properly bond to the metal.
You are correct, the weld may have failed and crashed the car. I am retired now but for 25 years I owned a business with 30 welders working two shifts.
So weekend before last, I was enjoying my 2021 KRX 1000 humming along a flat gravel road at a decent clip, but below 50mph. The road went left at about 60 degrees and I leaned into the turn pretty hard and was shocked at a quick snap like flip that sent me rolling. Luckily, I escaped relatively unhurt, but the unit is pretty banged up. The ROPS is NOT a roll cage is it is the same wall thickness as exhaust tubing and folded so I have ordered a true roll cage with intrusion bars as I want to avoid further concussions.

Finally got a chance to put the machine up on a lift and was surprised by what I found and would appreciate the opinion of others. The right rear trailing arm failed, and it appears that it broke clean off at the welds but I am not a metalurgist View attachment 1850
As a retired professional in the fabrication business this is a bad weld. I would have a certified welding inspector review the weld and provide a report. If found defective a state licensed Mechanical PE should also be retained. I would expect Kaw will want the part for their inspection, only let them do that under supervision of your PE. My guess Kaw will want you to sign a release of liability if they replace the car, also ask for the PE/inspectors fee's. For 25 years I owned a business with 50 employees fabricating welded industrial products, cold welds happen.
 

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As a retired professional in the fabrication business this is a bad weld. I would have a certified welding inspector review the weld and provide a report. If found defective a state licensed Mechanical PE should also be retained. I would expect Kaw will want the part for their inspection, only let them do that under supervision of your PE. My guess Kaw will want you to sign a release of liability if they replace the car, also ask for the PE/inspectors fee's. For 25 years I owned a business with 50 employees fabricating welded industrial products, cold welds happen.
That is how it is done the right way! BTDT in a similar field.
 

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You are correct, the weld may have failed and crashed the car. I am retired now but for 25 years I owned a business with 30 welders working two shifts.

As a retired professional in the fabrication business this is a bad weld. I would have a certified welding inspector review the weld and provide a report. If found defective a state licensed Mechanical PE should also be retained. I would expect Kaw will want the part for their inspection, only let them do that under supervision of your PE. My guess Kaw will want you to sign a release of liability if they replace the car, also ask for the PE/inspectors fee's. For 25 years I owned a business with 50 employees fabricating welded industrial products, cold welds happen.
Bingo! That’s exactly the path I would go down.

Luckily no one was seriously hurt in this rollover, but we all know it could have been a lot worse.
I’d be looking for Kawasaki to replace the car.
 
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