2016 Kawasaki ZX6R Fork Under Holder - ZX6R Forum
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post #1 of 30 Old 09-20-2017, 10:48 AM Thread Starter
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2016 Kawasaki ZX6R Fork Under Holder

hello guys, i recently got into an accident, my front forks got dented and wheel as well, i ordered new forks from OEM and new wheel, and i realize that was not the only problem. I installed the forks, and when i started mounting the Front wheel it was not fitting, so i realize that when i put the handles straight the fork under holder is not straight is sideways making my forks not straight. so i need to know if i should buy a new fork under holder or if i can fix this myself because its a very expensive piece. thanks.
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post #2 of 30 Old 09-20-2017, 11:20 AM
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It's called a triple tree. Try to line up the top triple tree with the bottom triple tree and see what happens.
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post #3 of 30 Old 09-20-2017, 11:47 AM
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OP,

The top and bottom triple clamps squeeze the fork legs..... the friction of that is all that holds them in alignment. The two triples are mated with a rod that passes through the steering neck, and that rod keeps the pressure on the steering neck bearings.

If the triples have been knocked out of alignment, there is a good chance that the rod is not at the correct pressure on the bearings any more. You should take that assembly apart and put everything back the way it should be, then re-install it into the steering neck and adjust the pressure on the bearings. Once you do that, you'll be able to see if the fork legs have been bent. (that takes a LOT of force, they tend to twist well before they bend.)

"Basic stuff fellas. Use your head for something other than to break your next fall."
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post #4 of 30 Old 09-20-2017, 01:04 PM Thread Starter
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zx6r triple tree.

so here its the triple tree the photo i tried to take it as straight as possible for you to see its not straight and yes the car hit me hard. guys i took everything apart and the triple tree is slightly dented on one side its not straight. so that should be the problem right? i tried hammering it to make it straight but its crazy strong so i guess i have no choice but to buy a new one.
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post #5 of 30 Old 09-20-2017, 01:29 PM Thread Starter
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i already tried and the forks still not straight. i uploaded another photo you can see how the triple tree is not straight on one side. so the triple tree is already a problem in the alignment.
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post #6 of 30 Old 09-20-2017, 01:41 PM Thread Starter
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and yes my old fork legs were bended badly thats why i had to buy new forks.
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post #7 of 30 Old 09-20-2017, 02:22 PM
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i already tried and the forks still not straight. i uploaded another photo you can see how the triple tree is not straight on one side. so the triple tree is already a problem in the alignment.
STOP, WHILE YOU'RE AHEAD.

The triple tree is made from hot cast aluminum (Al), therefore if you do manage to get it to budge it means you've sheared the Al lattice structure, which will under the right duress, will in fact result in critical failure of the component. The thing is it won't necessarily be some radical stunt move - it could be (enough) freeway expansion joints - you would have little if any advance notice prior.

I've known guys to heat the piece with a torch and then tried to pound it flat (one sees a myriad of crazy shit in the pits at a track). Now the holes for the fork tubes become out of round, and you've reshaped the failing lattice structure yet again - and not for the better.... ... ... and like a house of cards, the issues with the piece multiply exponentially. It's your bike, and your life. I generally subscribe to the theorem of not compromising items that keep my ass off the tarmac, and ones that help me to steer & stop.

You can pick them up on eBay, but again you don't know if the one you buy is square (in proper 3-D shape). If you go that route find out what the return policy is. OK, you ask how do you know if it's true? Set it on a flat surface, like glass table top, then use a machinist's rule or other accurate metal rule and check for proper level surfaces on an X (horizontal) axis and Z (diagonal) axis.

Other wise go to the dealer. Now, just for drool effect, there are some truly tasty ones milled from billet, but those cost dearly.
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post #8 of 30 Old 09-20-2017, 04:28 PM
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^^^^^ +1000000000000

How do you know only one of the triples bent?

If you got hit that hard, how do you know the frame is straight?

Surely the radiator was destroyed as well... how about the headers?

"Basic stuff fellas. Use your head for something other than to break your next fall."
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post #9 of 30 Old 09-20-2017, 05:04 PM
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It's fucked for sure. But I would check everything...bottom triple, top triple, steering stem, frame. If you crashed that hard to bend the forks and the bottom triple, that had to have been a really hard impact.

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post #10 of 30 Old 09-20-2017, 05:12 PM Thread Starter
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lower triple tree

okay ill buy it then. and guys i don't have money like that to take it to a mechanic and check for everything. im just buying part by part until i get it right, i was hit right on the side of the front wheel it was a side hit not a straight hit. so i know for sure the frame its straight, so hopefully this triple tree will fix my whole problem i found one in eBay for 170. cuz OEM sells it for 597 crazy expensive for a fucking piece of Metal. thanks all for your answer ill give you results when i get the part.
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post #11 of 30 Old 09-20-2017, 05:19 PM
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okay ill buy it then. and guys i don't have money like that to take it to a mechanic and check for everything. im just buying part by part until i get it right, i was hit right on the side of the front wheel it was a side hit not a straight hit. so i know for sure the frame its straight, so hopefully this triple tree will fix my whole problem i found one in eBay for 170. cuz OEM sells it for 597 crazy expensive for a fucking piece of Metal. thanks all for your answer ill give you results when i get the part.
Not saying you have to take it to a mechanic, just check everything yourself first rather than aimlessly buying parts until stuff bolts together. It's not hard to tell if most things are bent or not. The frame is tricky. There is absolutely no way you can say with 100% certainty that the frame is straight. You DON'T know that. The only way to truly check that is with a machine that takes a lot of measurements and is designed to check for frame straightness. Buuuut...with that said, even if it is slightly bent, you can technically still ride on it. Just depends on the severity of it, and it might affect handling a bit and your tire wear but you may not even notice it if it's not that bad.

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post #12 of 30 Old 09-21-2017, 10:17 AM
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^^^^^ +1000000000000

How do you know only one of the triples bent?

If you got hit that hard, how do you know the frame is straight?

Surely the radiator was destroyed as well... how about the headers?
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Quote:
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Not saying you have to take it to a mechanic, just check everything yourself first rather than aimlessly buying parts until stuff bolts together. It's not hard to tell if most things are bent or not. The frame is tricky. There is absolutely no way you can say with 100% certainty that the frame is straight. You DON'T know that. The only way to truly check that is with a machine that takes a lot of measurements and is designed to check for frame straightness. Buuuut...with that said, even if it is slightly bent, you can technically still ride on it. Just depends on the severity of it, and it might affect handling a bit and your tire wear but you may not even notice it if it's not that bad.
Just because you were not struck at a 90⁰ right angle does not in fact mean your frame &/or swingarm isn't tweaked. Often these sorts of 'off angle' blows inflict nearly as much damage, and due to the angularity, the force results in torsional twisting of the structure as seen in your lower triple tree. When analysis of the section(s) which are perpendicular to the torque axis, they result in shear stress. So, imagine the molecules in the hot (800+⁰ F) Al are extruded (hot Al forced thru a die with a ram) as the frame spars would be, are aligned in a lattice - think cross-hatch when viewed from an end point. Now this lattice provides great compression as well as good torsional strength. But what if a few of these sections were shifted off their axis; now add vibration - this can come in the form of static vibration when the frame is at rest as the bike is on its sidestand, or swingarm stand, and naturally much greater vibration when the motor is running+ your weight and road irregularities are added to the mix. This becomes a slippery slope as the fractured lattice junctures keep on slipping until they succumb to the inevitable tipping point.

While you are checking components to see if they are straight, pull the wheels and check the axles, too. Why? Because tweaked axles can eat up tires and and chain rings. It's a lot of work, I know, but you'll be happier with piece of mind.
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post #13 of 30 Old 09-21-2017, 10:46 AM
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^Damn Zed! You just went full nerd on him!! You're certainly not wrong, but damn! Talk about going above and beyond on explanations

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post #14 of 30 Old 09-21-2017, 01:16 PM
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He could have bought a slightly used set of forks off me for $375. I wonder how much the OEM forks cost?
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post #15 of 30 Old 09-21-2017, 01:25 PM
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^Damn Zed! You just went full nerd on him!! You're certainly not wrong, but damn! Talk about going above and beyond on explanations


Like all good things there has to be a kernel of not only enlightenment, but genuine hunger & humility. Why should I say "... he is incapable of grasping technical concepts," when I can say, "... he is teachable; I want to know the 'why,' not just a 'no you can't.... '

It is up to each of us to become informed - note I did not say smart(er), or something more demeaning. I know a number of PhD holders who are idiots, whilst knowing vastly less learned sorts whom I consider to be quite intelligent.

By having the full scope of the situation, NelsonSP can start to ask more probing questions. Or not. He now has an inkling of what risks are involved with little/inaction. Because 'no action is still an act,' it does not recuse him of responsibility.

SBK, you too are correct by advising (paraphrasing), not to just aimlessly buy parts. That's a 'fool's errand.' NelsonSP NEEDS a game plan, now he has slightly more data to formulate such a plan, and he now knows a few more of the 'why' parts of his plan.
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