Author Topic: CB750k ugly dent in functional speedo. (Read 1421 times)

alacrity · « **on:** April 08, 2021, 01:25:27 PM »

Got it this way. DMV has the mileage so I need to keep this one (odometer anyway)...
Is there an "easy" way to get this dent out? As I recall (could be mistaken), uncrimping and then recrimping these gauges isn't easy - especially if you don't want them to look as if they've been messed with.

Thoughts?

markmyodb · « **Reply #1 on:** April 08, 2021, 03:57:42 PM »

Maybe

https://www.ebay.com/itm/Honda-CB-750-Four-K7-For-F2-Chrome-Caps-Instruments-Gauge-Covers-New/362905389622?hash=item547ed8ca36:g:rBwAAOSwzXxaAuLV

chiefum · « **Reply #2 on:** April 08, 2021, 04:16:18 PM »

I didn't think it was overly hard to open them up, just take your time and don't rush. I used a paint can opener, going a little bit at a time. I crimped my originals back, I've heard the cb750faces replacements are softer and easier to crimp. What model are your gauges off? Maybe I have a replacement for your dented one.

caluser2000 · « **Reply #3 on:** April 08, 2021, 04:47:00 PM »

The big thing I found was try and precompress the rubber seal as you went along resealing them helped.

Just take your time, no hurry at all and you'll get it all sorted out.

caluser2000 · « **Reply #4 on:** April 08, 2021, 05:36:13 PM »

You could make a platform out of a sheet of wood or ply and cut a hole in it around the size of the speedo dia. just where the crimp is. Then attach a block of wood 90 degrees to the platform around 6" long by 1" wide and around 4" deep. Hold the platform in a vice using that adaition and mount the speedo in the platform to work on.

Idea just popped up around 10 minutes ago

jlh3rd · « **Reply #5 on:** April 09, 2021, 05:12:08 AM »

all good points, just easier said than done, especially for the first timer. I think the new crimp rings are every bit as stiff as the original. It was difficult to get that ring crimped while working around my squeezing device. mask that new housing when assembling. Since the underside of the ring sits in the rubber support, you can't see the ring dents.
There's a guy named Marcel who will redo the clocks or sell the parts.....he's overseas, so there's that.
CMS sells parts, or did, at least for the 550.
The speedo is NOS, the tach I redid, first time.

BenelliSEI · « **Reply #6 on:** April 09, 2021, 05:17:27 AM »

Quote from: markmyodb on April 08, 2021, 03:57:42 PM

Maybe

https://www.ebay.com/itm/Honda-CB-750-Four-K7-For-F2-Chrome-Caps-Instruments-Gauge-Covers-New/362905389622?hash=item547ed8ca36:g:rBwAAOSwzXxaAuLV

Good suggestion. I use them for just your reason!

Little_Phil · « **Reply #7 on:** April 09, 2021, 06:07:29 AM »

Or if it works fine, just fill it. Did a couple of smaller dents on one of mine years ago, no one knows...except all of you.

PeWe · « **Reply #8 on:** April 09, 2021, 09:39:51 PM »

Find another speedo. They usually do not cost much for later than K2 bikes.

There are otherwise several threads on this forum where people carefully open the rings to take the gauge apart, close same ring when ready.
There is another blue-green cover inside that might be dented too.

Kevnz · « **Reply #9 on:** April 09, 2021, 10:32:02 PM »

+1 on the fill it suggestion, especially if you don;t want it to look like it's been opened up. Done properly, would be invisible.

alacrity · « **Reply #10 on:** April 09, 2021, 11:49:47 PM »

Quote from: chiefum on April 08, 2021, 04:16:18 PM

I didn't think it was overly hard to open them up, just take your time and don't rush. I used a paint can opener, going a little bit at a time. I crimped my originals back, I've heard the cb750faces replacements are softer and easier to crimp. What model are your gauges off? Maybe I have a replacement for your dented one.

Hi:
These are from a 1975 cb750k

PeWe · « **Reply #11 on:** April 10, 2021, 01:17:40 AM »

I think the cb750faces replacements are harder.
I have a set and it might be trickier when they are new, no beginning of a bend.

A tool is needed. Maybe a clamp, halves shaped as the crimped ring, clamp and squeeze together. I have a set of K2 gauges with new faces, glass, seals, upper black covers in need to be assembled.

dave500 · « **Reply #12 on:** April 10, 2021, 01:44:52 AM »

we have paintless dent removal places pull out hail damage dents on site,they might be able to mostly pull it out then you fill it,im not keen on opening those up,plan A becomes plan B ?

caluser2000 · « **Reply #13 on:** April 10, 2021, 01:55:28 AM »

It is quite an easy fix . Just take your time and don't over think it.

pjlogue · « **Reply #14 on:** April 10, 2021, 02:51:08 AM »

I don't think the DMV in most states would track mileage on a 40+ year old vehicle/bike. Your best bet is to swap the case for one off ebay if you want to retain the innards. At a minimum, I would at least seal your current gauge so dirt/water can't get in.

Does anyone know if aluminum crimp rings are available? The stainless ones are truly very hard to re-crimp! I messed up my gauges last fall (after very carefully restoring them) when I was loading my 750 on the back of the truck. I am in the same situation as thee OP in that I need to replace the shells but want to retain the innards. I have owned my bike since new and each mile on the odometer is a sweet memory!

-P.

alacrity · « **Reply #15 on:** April 11, 2021, 02:02:06 PM »

Quote from: dave500 on April 10, 2021, 01:44:52 AM

we have paintless dent removal places pull out hail damage dents on site,they might be able to mostly pull it out then you fill it,im not keen on opening those up,plan A becomes plan B ?

Don’t the Pdr guys need access to the interior wall so that they can stick their tools in? I don’t see how that can work here. If I have to open it up, I can fix it on the bench with one of my small dollies. But it’s the open/close that is the issue

alacrity · « **Reply #16 on:** April 11, 2021, 02:03:30 PM »

Quote from: caluser2000 on April 10, 2021, 01:55:28 AM

It is quite an easy fix . Just take your time and don't over think it.

Is it really? You wanna do it? I’ll fedex it right over. :-)

RAFster122s · « **Reply #17 on:** April 11, 2021, 03:57:04 PM »

He is in New Zealand...you are going to have a hefty postal bill...

caluser2000 · « **Reply #18 on:** April 11, 2021, 05:17:07 PM »

Quote from: RAF122S on April 11, 2021, 03:57:04 PM

He is in New Zealand...you are going to have a hefty postal bill...

Yip worth more than the item is worth. A new replacement will cost less. Plus there will be my exorbitant hourly rate on top of that and the organization of the return freight will have a teeny weeny itsy bitsy markup.

I'd never use Fedex. Other couriers cheaper an just as efficient anyway. I did international dispatch of aircraft parts for 6 years or so.

I'm of the opinion that those who have these old m/cs should be able to carry out rather minor repairs like this one.

I've given the OP a suggestion that will make doing the job far far easier.

News:

Author Topic: CB750k ugly dent in functional speedo. (Read 1421 times)