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Old 08-23-2011, 11:45 AM   #1
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Joined: Dec 2010
From: Portland, OR

I Ride: 1979 Honda CB750K
Holy Explative, this is Very not good.
Mechanical & Technical

Glad i gave the bike a once over before going for a ride.
Now, to weld it, buy a new frame, or part out the bike and buy a different one.


Any ideas on how this could have happened? (And no, I didn't crash.)

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Old 08-23-2011, 11:54 AM   #2
Superbiker
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Joined: Mar 2010
From: Rock Island,WA/ Volcano, HI

I Ride: ^That^
Looks pretty clean and smooth to be anything other than a cut.

Have it welded, it's not like it won't be plenty strong afterwards.

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Old 08-23-2011, 12:00 PM   #3
Moderator
MichelinMan's Avatar
 
Joined: May 2007
From: The Wet Eastside

I Ride: CBR 600RR
How could it randomly get cut like that? Did you ever look it over that in-depth before?

It looks like it's bolted together too... lol

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Old 08-23-2011, 12:11 PM   #4
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Joined: Apr 2007
From: Youngstown NY

I Ride: Speed Triple, GS750, KX 500, 450 EXC-R, KH400, MXZ 700 Renegade
Jesus!

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Old 08-23-2011, 12:14 PM   #5
Shredder
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Joined: Apr 2006
From: Richland, Washington

I Ride: Whatever strikes my fancy for the day...
That must be one of them fancy frames!

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Old 08-23-2011, 12:17 PM   #6
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Joined: Mar 2007
From: Monroe-mish, WA
Blog Entries: 5

I Ride: 07 YZ450F, 74 XL350
was there a weld there? if so, poor welding?

looks like it might be a 2 piece design (for engine removal), but that triangle piece is what is the issue....if so, it should be a much easier fix than you're thinking.

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Old 08-23-2011, 12:33 PM   #7
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Joined: Feb 2007
From: Seattle

I Ride: 06 600RR
check this out

http://www.cheapcycleparts.com/model...assemblies/282

it appears they made it this way

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Old 08-23-2011, 12:55 PM   #8
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Joined: Nov 2007
From: .
Blog Entries: 2
lol

stupid manufacturers.....better rush out and buy a new bike

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Old 08-23-2011, 12:58 PM   #9
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Joined: Mar 2011
From: Seattle

I Ride: 04 636 (silver /w black flames)
i see nothing wrong...

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Old 08-23-2011, 01:00 PM   #10
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66 Enfield's Avatar
 
Joined: May 2007
From: Closer than you think!

I Ride: 2 wheeled ones.
Looks like a clean cut...makes no sense..

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Old 08-23-2011, 01:06 PM   #11
Peg Dragger
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Joined: Mar 2007
From: Redmond, WA

I Ride: what others won't
“ Quote:
Originally Posted by 1shinysideup View Post
check this out

http://www.cheapcycleparts.com/model...assemblies/282

it appears they made it this way
Uh, yup. Frame is made that way. Nothing wrong.

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Old 08-23-2011, 01:26 PM   #12
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Joined: Jun 2010
From: Aloha, Oregon

I Ride: Buell XB9S
Broken weld on the motor mount looks like it could be a problem. Looks like an easy fix.

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Old 08-23-2011, 03:30 PM   #13
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Joined: Dec 2010
From: Portland, OR

I Ride: 1979 Honda CB750K
I've definitely looked over this bike in depth, several times. I check it every few weeks. It's an old bike. They need extra attention. Also, my friends with old bikes have looked it over. Also, the shops i've been to. Also, Tues Night Coffee people. There's no way we could have all missed it. There is no rust at the breakpoint. It's new.

And no, it's not supposed to be like that. It's not a 2 pc frame ;o) Here is the other side, one solid frame pipe:
Mechanical & Technical

The engine mount is on both sides of each downtube of the frame (Aka: 2 mounts per downtube) Then the crash bar mounts onto the engine mount. There was no welding there from before i bought the bike. I mean, there's a slim possibility that i never noticed a critical weld on the frame of my bike. But, i've examined the bike over and over. :o\

Either way, to fix the frame, replace the frame, or part it out, i have to completely teardown the bike. {sigh} Might go for something a little more modern.

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Old 08-23-2011, 03:33 PM   #14
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Joined: Feb 2007
From: Seattle

I Ride: 06 600RR
“ Quote:
Originally Posted by 1shinysideup View Post
check this out

http://www.cheapcycleparts.com/model...assemblies/282

it appears they made it this way
did you not click the link??

Edit* can you shoot a pic of what it looks like from the front? If anything, have it welded, between the weld and that fancy get up holding it together I'd ride it.

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Last edited by 1shinysideup; 08-23-2011 at 03:39 PM..
 
Old 08-23-2011, 03:35 PM   #15
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Joined: Mar 2010
From: Rock Island,WA/ Volcano, HI

I Ride: ^That^
“ Quote:
Originally Posted by 1shinysideup View Post
did you not click the link??
Obviously not......

Dur Dah Dur!!!!

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Old 08-23-2011, 03:35 PM   #16
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Joined: Nov 2007
From: .
Blog Entries: 2
Mechanical & Technical

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Old 08-23-2011, 03:39 PM   #17
Je Fa Fa
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Joined: Mar 2007
From: Monroe-mish, WA
Blog Entries: 5

I Ride: 07 YZ450F, 74 XL350
piece 2 is the piece you think is broken.

but piece 4 the piece you should make sure is fine. if it's fine, it's fine.

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Old 08-23-2011, 03:40 PM   #18
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Joined: Dec 2010
From: Portland, OR

I Ride: 1979 Honda CB750K
I clicked the link. I mispoke when i said it's not a 2 piece. But, at the same time, the engine mount isn't supposed to be bent, and the pieces should probably be lined up, not offset the way they are. You can't see it from the angle of my pic, but the two frame pieces do not line up at all, when looking straight on.

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Old 08-23-2011, 03:44 PM   #19
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Joined: Nov 2007
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Blog Entries: 2
“ Quote:
Originally Posted by prophetnoise View Post
I clicked the link. I mispoke when i said it's not a 2 piece. But, at the same time, the engine mount isn't supposed to be bent, and the pieces should probably be lined up, not offset the way they are. You can't see it from the angle of my pic, but the two frame pieces do not line up at all, when looking straight on.
Now you're just reaching for straws.

Nothing there looks bent other than factory bends. Maybe you should take it to a proffessional, one who knows what kind of "special care" your bike needs and let them make the assertion as to whats bent.

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Old 08-23-2011, 03:45 PM   #20
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Joined: Dec 2010
From: Portland, OR

I Ride: 1979 Honda CB750K
“ Quote:
Originally Posted by koorbloh View Post
piece 2 is the piece you think is broken.

but piece 4 the piece you should make sure is fine. if it's fine, it's fine.
Yup. Pieces 3 and 4 are the mounts holding the frame parts together, and are visible bent askew. That's why the downtubes don't line up, and there is a gaping space between them.

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