Author Topic: This can't be good (Read 2713 times)

SKTP · « **on:** July 27, 2009, 02:31:47 AM »

This is the bottom of my frame on my 1978 CB750K. Its on the kickstand side near the front...I searched for "frame holes" and came up with nothing....PLEASE HELP!!!...its my daily driver so it doesn't have to be pretty...I'm hoping a good mechanic/welder can cut out the rust and weld on a new piece of metal?...all suggestions for a solution welcome

clarkjh · « **Reply #1 on:** July 27, 2009, 02:55:04 AM »

Sorry to say, but I think that frame is toast. Unless you know or can find a really good wielding shop that could bend and wield in a whole new piece.

James

CBJoe · « **Reply #2 on:** July 27, 2009, 03:00:11 AM »

I wouldn't be riding that bike until you replace the frame. NOT SAFE...

If you have rust through like that there, I'd be that other places have the same problem (even if you cant see it yet).

Sorry... Joe

Deltarider · « **Reply #3 on:** July 27, 2009, 03:01:47 AM »

Quote

Sorry to say, but I think that frame is toast.

Not necessarily. If it's local (due to parking in long grass for instance), it can be welded easily.

manjisann · « **Reply #4 on:** July 27, 2009, 04:03:00 AM »

A couple options, sourcing another titleable frame (I know it's not what you want to hear, but it is an option), cutting the entire piece out and welding in another one (I am no expert, far from it, but you have to be careful where you place your weld as stesses could break either the weld or the metal next to it), throw in the towel and turn it into a chopper

. I have no idea what welding would cost, you may luck out and find a frame you could use.

Any way you go, thats a real bummer, sorry

Brandon

mcpuffett · « **Reply #5 on:** July 27, 2009, 04:05:15 AM »

You could cut the same piece (but in good shape) out of a donor frame and have it welded in but i think you may have to take your engine out to do a really good job? is that right under a lower engine mount?, cheers Mick.

Bill Vaughan · « **Reply #6 on:** July 27, 2009, 05:15:12 AM »

Ouch.

Send the picture/talk to these guys: http://www.snowcrest.net/gte/

mlinder · « **Reply #7 on:** July 27, 2009, 05:55:59 AM »

Where are you? I have a titled frame you could have, if you come dissasemble the bike.

bryanj · « **Reply #8 on:** July 27, 2009, 06:33:43 AM »

I think thats the 3rd 77/78 550 i seen do that---in the same place too.

It can be welded with care, and i would say a BIG patch would be OK but unsightly, trouble is engine and exhausts need to come off so its time

SKTP · « **Reply #9 on:** July 27, 2009, 06:52:28 AM »

WOW...this sucks and is totally unexpected...I know someone that is selling 2 78s both for under $1000 (each). I guess I'm going to check those out ASAP...thanks for your input SOHCers

I wonder how fast someone that has never removed a whell can transfer frames? Wish me luck...

mlinder · « **Reply #10 on:** July 27, 2009, 06:58:51 AM »

Where are you located?

SKTP · « **Reply #11 on:** July 27, 2009, 07:43:10 AM »

Southern California

754 · « **Reply #12 on:** July 27, 2009, 08:17:08 AM »

do you get a lot of fog or mist off the ocean, that gets on the bike and collects down there?

SKTP · « **Reply #13 on:** July 27, 2009, 08:57:27 AM »

Yes, its foggy and overcast almost every morning...

Altdo · « **Reply #14 on:** July 27, 2009, 09:03:44 AM »

Bad break man, I've got a frame that you can have. It's just in New York. If you can sort out how to get it to the Left Coast, it's yours.

754 · « **Reply #15 on:** July 27, 2009, 09:23:39 AM »

Stkp,
I would just weld it, got nothing to lose.
Wirewheel the heck out it first , pick away the rotten thin parts and check the other frame tube.

Form a flat patch out of 1/16 in steel or slightly thicker(wide enough to reach to clean metal), then curve it to fit the frame as in looking from the side.. you should be able to round it the other way by heating and tacking, unless the hole is too big.

Nothing to lose, a repaired fram is better than one with holes in it!

SKTP · « **Reply #16 on:** July 27, 2009, 12:10:19 PM »

Quote from: Altdo on July 27, 2009, 09:03:44 AM

Bad break man, I've got a frame that you can have. It's just in New York. If you can sort out how to get it to the Left Coast, it's yours.

Love to see pictures of it...mlinder's too...

I think I am goign to look into a repair or buy a parts bike...the fun never ends!

also...thanks a million for the generous offers and the advise, greatly appreciated

mlinder · « **Reply #17 on:** July 27, 2009, 01:01:52 PM »

Ah, it's in reasonable shape. Needs a little love, but then again, whioch of these old bikes doesn't? Nothing a bit of time and some satin black paint couldn't fix.

razor02097 · « **Reply #18 on:** July 27, 2009, 02:12:24 PM »

A good welding shop can fix that up but

#1 it would have to be stripped to frame

#2 it may cost as much as getting a used frame.

I guess it all depends on what you think is best and how far you are willing to take it.

Don R · « **Reply #19 on:** July 27, 2009, 06:33:53 PM »

That looks a lot like my 70 K model. Mine is a long split but in the same area. It looks like the PO liked to jump curbs. I plan to cut a section from another frame and weld it in place using the motor mounts for location. After tacking in the parts with a small tube sleeve inside I will remove the lower 1/2 of the engine, [top already off] and complete the welding. I am also doing the frame tube removal kit I got from Gordon. Mine was already cut there. I am only spending this effort because it is an early serial number. Not very original though. A parts bike is a viable option. They can be had around here for a reasonable price. My thread should be here somewhere, I got some good advice.

Don R · « **Reply #20 on:** July 27, 2009, 06:42:34 PM »

Check the K0 frame repair thread and look at the link to the chopper site. there are some diagrams of possible ways to make a weld joint.

SKTP · « **Reply #21 on:** July 27, 2009, 10:37:32 PM »

I have a line on a 78F frame...are they much different from the K

If I do swap frames....will I have titling issues (I'm in California)...

has anybody ever shipped a frame? How much money are we talking (ballpark)...

I'm thinking a 78K parts bike might be the way to go...I'm going to look at one for around $700 this week...just when I thought getting my mags on and a dual-disc conversion were my final tasks...OUCH!

754 · « **Reply #22 on:** July 28, 2009, 09:19:47 AM »

&8 F has different seat mounts & kickstand location, than yours.

usually if you swap frame, you buy one with reggie, register it, then put all your stuff on.

Lots of Tig welders here could easily weld that with motori, and pipes off, forks off would help.

SKTP · « **Reply #23 on:** July 28, 2009, 09:34:12 AM »

Yes, I went to a hotrod builder this morning...he thinks he can weld it up for 2 hundred bucks or so, motor in...he's also goign to check the rest of the frame to see if its safe and still worth fixing...

SKTP · « **Reply #24 on:** July 30, 2009, 05:02:58 PM »

Here's where I am at now...

Alan F. · « **Reply #25 on:** July 30, 2009, 07:55:20 PM »

Looks good from here! I guess he didn't find much else wrong with the frame then.

1timduke · « **Reply #26 on:** July 31, 2009, 06:28:40 PM »

Did the guy who did it offer any warranty on his fix? Just make very sure to check that thing out from time to time, cracks form from stress and oxidation well before the naked eye can see it. If you're not into jumping curbs

and such, it will probably be okay. Myself, I always keep my frame covered in oil from various leaks, keeps parts from rusting

-Tim

Oh yeah, clean and paint that thing with a good paint real soon if you haven't already.

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Author Topic: This can't be good (Read 2713 times)

Altdo