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Administrator
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That is a set of K model forks. I'm guessing, you have the wrong seal.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Why would the piston measure to be 42.8 mm across? The piston per the vintagecb750 site is 38 mm. And the kit they shipped me is the same part number as what they say is for a 81 750k like I have.
Am I able to use a generic o-ring for this? Or does it have to be the straight cut?
Turbos, Hondas, 4-bangers, what could go wrong?
 Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Administrator
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It has to be one of the straight cut-or square ring seals.A typical round o-ring probably wouldn't hold up to the pressure.
Man,that sucks.You waited on parts then got the wrong ones.And not by your fault. Thats the worst. 
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I'm sure vintage will make it right. Give them a call.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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I'm sending them an e-mail since I have a job interview at 2 pm. Going to send 'em the pictures and a link to this thread so they can see the bike and help determine what I've got as well.
In other news, what sort of company conducts in-person interviews on a Sunday at 2 pm when they are in a city that's typically hung over on Sundays? Lol.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Um, a lot of business people are hung over at work and just know how to hide it, lol. I work at a bank and they tell me about their meetings they go to and everyone there was partying the night before, all running off of like 3 hours of sleep and all hung over badly, still have productive meetings.
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Administrator
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LOL. Thats funny. Good luck with your job interview.Hope you get good news back.
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Thanks Shiny, I will find out more on Wednesday or Thursday. Interview went great so I am expecting a second one to be offered up to me.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Well, I have threads up on dotheton and cb750c.com. Hopefully someone over there can identify what I've got.
Now off to put up a wanted thread for both and see what I get. Hoping someone can identify 'em versus me buying a new caliper!
Besides, a 42.8mm piston vs. 38mm piston means more stopping power  Unless it's less because of more surface area for the fluid to cover. 
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Administrator
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Do you still have the package? A part number search by that manufacturer should tell you what it fits.
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Administrator
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OH,sometimes at the shop we get parts that the package/part number are correct,but the item is mispackaged.Happens QUITE often with Aeroquip.
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Administrator
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That says rear caliper kit. I thought you were working on your front caliper?
Is this what your kit looks like? Strange that the rear caliper would hold a larger piston than the front?
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I am. But I'm wondering if the pieces from that rebuild kit will work with my front caliper. I bet it probably would, as 42.8mm is 42.8mm.
I have no idea what I've got for a front caliper lol. It might be a rear caliper for all I know!
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Administrator
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shinyribs wrote
That says rear caliper kit. I thought you were working on your front caliper?
Is this what your kit looks like? Strange that the rear caliper would hold a larger piston than the front?
But he has an 81 model.  I think he has the wrong kit.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Administrator
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His bore was 38 to begin with.He just sanded it out to 42.8. Too much sanding  lol just kidding man. Dude,this sucks...and is very confusing
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The wrong kit from vintagecb750? Per them, my piston diameter is wrong. Here's what went back n forth:
Me: Vintage CB750-
I ordered the brake kit below on the 22nd. It turns out that the seal doesn't actually fit my bike. I have a 1981 CB750K, and went to do the seal on the caliper last night but it is simply too small.
I've linked pictures showing what I'm referring to.
In this one, you can see the seal doesn't fit into the caliper. It's actually hanging off on the right side:
http://sphotos.xx.fbcdn.net/hphotos-ash3/560399_10100729423007362_12101664_52975929_57904787_n.jpgThis one shows how the seal doesn't fit onto the piston. There's actually material off to the side.
http://sphotos.xx.fbcdn.net/hphotos-prn1/559557_10100729420367652_12101664_52975922_1694269237_n.jpgIs there a way to verify whether the seal in the kit is the proper seal? I measured the piston with a caliper, it's 42.8mm across. The seal definitely does not work for this piston. In case you want to see the forks to determine if I actually have a CB750K, here's a link to a thread with quite a few different pictures.
http://honda-cb750-s.456789.n3.nabble.com/1981-CB750K-Repair-Tune-up-td3846604i40.htmlThem: I tried looking into this for you but currently I am stumped. I would be happy to send a refund your way for this item. I know this will not fix your bike up but hopefully you are able to find the part you need elsewhere? Please let me know if this sounds good, sorry I can't help more with this I would love to do what ever I can to get your bike on the road. Also, can you please let me know your order number so I can refund you for this item.
Thank You for your understanding,
So they checked out what happened, I'm guessing this thread, but they aren't sure either. Plus, they say their piston for the CB750K is a 38mm piston. So I'm thinking they sent the right kit, I have an off-shoot caliper. I think that kit, while for the back of the bike, should work on my caliper at least.
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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I knew I was strong, but so strong that I was able to enlarge the piston? Dang! I mean, I even got them quite close in tolerance, where if it's not PERFECTLY straight the dang thing wants to stop from going in! I'm just amazing! 
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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