Author Topic: The CB750 gas tank dilemma  (Read 2718 times)

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Offline kyle750

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The CB750 gas tank dilemma
« on: March 18, 2025, 01:38:16 AM »
Many thanks for the help and assistance on the evaluation of my CB750 gas tank. Not an easy decision but for my peace of mind I decided to replace.   Another very strange coincidence and rather than add on to the other thread decided to start a new thread.  Gas tanks seem to be a popular pastime with CB owners  :) 

A very kind CB750 owner alerted me to a very faded but solid sunrise flake orange? (not exactly sure of the exact color?) gas tank that came up for sale priced at $200 as a possible replacement for my candy gold K2 gas tank. Thank You Sir for the heads up - very much appreciated! Obviously this tank would need to be refinished and repainted.

I sent an email to Yamiya inquiring about the availability of their currently out of stock candy gold tank and side covers set and I am waiting for a reply. I hope to hear back from them very soon!

The exterior of this tank looks decent to my eye but I am not an expert and I don't know how to properly evaluate the condition of the interior for rust?? 
« Last Edit: March 19, 2025, 03:39:09 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #1 on: March 18, 2025, 02:23:35 AM »
I found this in an older post.  Very Cool  8)
« Last Edit: March 18, 2025, 03:32:43 AM by kyle750 »

Offline 69cb750

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Re: The CB750 gas tank dilemma continues
« Reply #2 on: March 18, 2025, 05:15:00 AM »
Your tank has some rust, better then most.
What happened to original tank?

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #3 on: March 18, 2025, 05:32:16 AM »
Your tank has some rust, better then most.
What happened to original tank?

http://forums.sohc4.net/index.php/topic,204847.0.html

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #4 on: March 18, 2025, 06:08:04 AM »
I just watched a video for Evapo-Rust.   Truly amazing and it's available in Thailand.  Price for 1 gallon (3.78 litres)  in the USA $30 on Amazon and price for 5 litres  in Thailand is $60  >:(   


Offline Mark1976

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Re: The CB750 gas tank dilemma continues
« Reply #5 on: March 18, 2025, 06:23:06 AM »
   Buying used tanks for bikes of this age can be a crap shoot at best, I've bought more than my share over the yrs, having someone give you a lead on a good tank is helpful but no guarantee either (been there). My advice (just mine, you can do as you please) is every used tank is never worth more than $150, so always get it for the lowest possible price, ya still have to recondition the thing and believe it or not, its not a cheap endeavor these days (even decent rattlecan paint is getting up there), and that doesn't even recognize whether or not you have the skill or abilities (or the necessary equipment) to take on such a task.
   I'm saying you shouldn't or can't, but understand what you're signing up for, it's a process/journey to learn how to do it correctly. Nothing worse than dumping $400+ dollars down on a tank and repaint and graphics and then looking at the finished product and thinkin, "that could have gone better."
Start with the end in mind...

Online newday777

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Re: The CB750 gas tank dilemma continues
« Reply #6 on: March 18, 2025, 06:25:49 AM »
I just watched a video for Evapo-Rust.   Truly amazing and it's available in Thailand.  Price for 1 gallon (3.78 litres)  in the USA $30 on Amazon and price for 5 litres  in Thailand is $60  >:(
You need to fill the tank full to the brim when using Evaporust so you need 5 gallons.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #7 on: March 18, 2025, 06:29:09 AM »
I just watched a video for Evapo-Rust.   Truly amazing and it's available in Thailand.  Price for 1 gallon (3.78 litres)  in the USA $30 on Amazon and price for 5 litres  in Thailand is $60  >:(
You need to fill the tank full to the brim when using Evaporust so you need 5 gallons.

5 gallons of Evapo-Rust in Thailand would cost $240.  I have big dreams of using Evapo-Rust but I'm on a distilled vinegar budget  :P

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #8 on: March 18, 2025, 06:44:37 AM »
   Buying used tanks for bikes of this age can be a crap shoot at best, I've bought more than my share over the yrs, having someone give you a lead on a good tank is helpful but no guarantee either (been there). My advice (just mine, you can do as you please) is every used tank is never worth more than $150, so always get it for the lowest possible price, ya still have to recondition the thing and believe it or not, its not a cheap endeavor these days (even decent rattlecan paint is getting up there), and that doesn't even recognize whether or not you have the skill or abilities (or the necessary equipment) to take on such a task.
   I'm saying you shouldn't or can't, but understand what you're signing up for, it's a process/journey to learn how to do it correctly. Nothing worse than dumping $400+ dollars down on a tank and repaint and graphics and then looking at the finished product and thinkin, "that could have gone better."

I greatly appreciate the very thoughtful and thorough response.  Lots of information to consider. I still have not decided if I should buy new or used and then repaint.  Looking at possible options at this point    If I decide to go the used route I would never attempt to repaint a tank.  Painting is difficult and I believe auto body painting is better left to highly skilled professionals.  Just to let you guys know the K4 sunrise flake orange bike that I am looking at has been repainted.  The bike was originally red  :o  Someone did very nice work I think!
« Last Edit: March 18, 2025, 08:18:37 AM by kyle750 »

Offline BenelliSEI

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Re: The CB750 gas tank dilemma continues
« Reply #9 on: March 18, 2025, 12:37:45 PM »
Have a good look at your tank. If it was mine I’d get the brazing around the neck repaired and reuse it. Unless you buy a complete Yamiya kit, you’re going to have to paint anyways.

If it doesn’t leak, hit it with vinegar and go from there…..

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #10 on: March 18, 2025, 02:05:13 PM »
Another photo from the seller of the Sunrise Flake Orange K4 currently for sale.  I was very surprised to learn that originally the bike was Red
« Last Edit: March 18, 2025, 06:14:14 PM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #11 on: March 18, 2025, 09:31:54 PM »
Gas drained.  The old tank is off and now removing the pet cock and badges.  Bottom trim is in poor condition and is not reusable.  Previous owner used double sided tape to the backside of the HONDA badges.  I carefully slid a knife down and across to cut the tape and then gently pryed at the area around the pins and both badges came out easily with all 4 pins intact.  Easy!

I'll apply paint stripper and remove the glue strips to the backside first and then strip the front of the badges and repaint. Should be a Fun and Easy Project!

Late Edit:  I just noticed the early badges the outer black edge area is contoured/shaped around the letters (shadow effect).  Later badges have a straight top and bottom edge. 
« Last Edit: March 19, 2025, 06:40:40 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #12 on: March 19, 2025, 03:29:04 AM »
HONDA badges -  paint stripped.  There is still some black in the recessed areas and around the outer edges that needs to be removed 

« Last Edit: March 19, 2025, 03:53:51 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #13 on: March 19, 2025, 03:57:15 AM »
NOS HONDA K2 tank badges with the same texture to the inside of the letters
« Last Edit: March 19, 2025, 04:05:43 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #14 on: March 19, 2025, 04:09:21 AM »
Here is an interesting set of vintage tank badges and according to the seller are from a Honda CB750 K2.  Notice the texture is in the surround black area and the outside border is smaller than the HONDA letters.  Good looking very minimalist HONDA emblem!
« Last Edit: March 19, 2025, 06:30:17 AM by kyle750 »

Online newday777

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Re: The CB750 gas tank dilemma
« Reply #15 on: March 19, 2025, 04:09:51 AM »
Double sided tape comes off with denatured alcohol without hurting the finish like paint stripper does.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #16 on: March 19, 2025, 04:12:27 AM »
Double sided tape comes off with denatured alcohol without hurting the finish like paint stripper does.

The paint stripper had no effect on the metal.  If keeping the original paint to the front then a very good idea!
« Last Edit: March 19, 2025, 04:13:58 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #17 on: March 19, 2025, 04:17:50 AM »
Also I just noticed that the letters N and A have extra serifs to the left that give the HONDA font a unique sense of motion and speed
« Last Edit: March 19, 2025, 07:05:51 AM by kyle750 »

Online newday777

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Re: The CB750 gas tank dilemma
« Reply #18 on: March 19, 2025, 04:19:44 AM »
NOS HONDA K2 tank badges with the same texture to the inside of the letters

South Sound Honda in Washington state shows the right side is still available to order. Left has been discontinued. (There are different part numbers for each side!)
They fit 1972-1976 K models.
« Last Edit: March 19, 2025, 04:21:51 AM by newday777 »
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #19 on: March 20, 2025, 03:23:28 AM »
Badges repainted by a good Thai friend.  4 small paintbrushes.  2 light coats of semi-gloss acrylic enamel black painted first and then 2 coats of semi-gloss white with a touch of orange added (to give it a vintage creamy off white tone). Removed any paint to the exposed chrome lines of the HONDA letters.   They look AMAZING.  Tomorrow I will put them in the hot sun to cure the paint. 

Offline Cevan

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Re: The CB750 gas tank dilemma
« Reply #20 on: March 20, 2025, 04:16:29 AM »
I used white vinegar and filled the tank to the brim.  It loosen all the surface rust nicely.  Inside looks new now.  Must have had it in there for a couple of weeks.  Zero leaks.  Then I go to put gas in to test fire my newly rebuilt engine and it’s weeping out the side near the peacock.  Seems like gas molecule must be smaller.  Wired wheeled that area and found a small pinhole and more surface rust.  Dropped it off at a place to have them braze or solder it.  Fingers crossed. 
1972 CB500/4
1974 CT70

Offline Little_Phil

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Re: The CB750 gas tank dilemma continues
« Reply #21 on: March 20, 2025, 04:23:37 AM »
I found this in an older post.  Very Cool  8)
They are the work of tanklackieren (Menno Dek) I've had two sets of 500 parts sprayed by him. Expert in the candy finishes.

https://tanklackieren.de/Honda-colours

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #22 on: March 20, 2025, 05:05:22 AM »
I used white vinegar and filled the tank to the brim.  It loosen all the surface rust nicely.  Inside looks new now.  Must have had it in there for a couple of weeks.  Zero leaks.  Then I go to put gas in to test fire my newly rebuilt engine and it’s weeping out the side near the peacock.  Seems like gas molecule must be smaller.  Wired wheeled that area and found a small pinhole and more surface rust.  Dropped it off at a place to have them braze or solder it.  Fingers crossed.

Wishing you the very best of luck and hoping your tank is 100% OK.  Not easy trying to deal with 55 year old metal. 

Offline kyle750

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Re: The CB750 gas tank dilemma continues
« Reply #23 on: March 20, 2025, 05:08:28 AM »

They are the work of tanklackieren (Menno Dek) I've had two sets of 500 parts sprayed by him. Expert in the candy finishes.

https://tanklackieren.de/Honda-colours

Absolutely stunning work.  Thanks for the link. 

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #24 on: March 20, 2025, 05:07:02 PM »
Honda offered so many cool colors in the 1970s  8)

« Last Edit: March 20, 2025, 05:09:19 PM by kyle750 »

Offline Stev-o

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Re: The CB750 gas tank dilemma
« Reply #25 on: March 21, 2025, 07:14:59 AM »
Honda offered so many cool colors in the 1970s 

You would really like riding a 550, they are much lighter and nimble than the 750 but still has adequate power [around 50hp]
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #26 on: March 21, 2025, 04:11:59 PM »
Honda offered so many cool colors in the 1970s 

You would really like riding a 550, they are much lighter and nimble than the 750 but still has adequate power [around 50hp]

I think I would love riding a 550 with  excellent handling.  There is a green one here in Thailand that is a real beauty. The colors available on the 550 over the years are all stunning. 

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #27 on: March 21, 2025, 04:18:00 PM »
Still undecided on a gas tank replacement and still waiting to hear back from Yamiya.

I found this candy gold gas tank from Germany that sold 2 years ago.   I think the black HONDA badges look good.    Not exactly sure if this tank is original or a reproduction.  Sold for €699 Euro plus shipping which I think is a reasonable price for a ready to install tank with badges and cap (still needs bottom trim). Has the black tank stripe been painted on or is this a decal/sticker??   I contacted the seller to see if he has any more gas tanks available.

Also a concern is the candy gold paint color on any tank will certainly not be a perfect match to the candy gold paint that is currently on the sidecovers, fork ears, and headlight bucket.

« Last Edit: March 22, 2025, 06:24:00 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #28 on: March 21, 2025, 04:53:08 PM »
Immediate response from the seller

Hi, I can offer you a Repro fuel Tank in Candy Gold
Genuine is no longer available
Best regards


I just re-read the sold listing and it says original HONDA tank

https://www.befr.ebay.be/itm/325567540570

Repro tanks from vendors other than Yamiya make me nervous.  I see a lot of repro tanks for sale on Ebay from India with very low quality photos showing no detail.  Red Flag to Stay Away!

« Last Edit: March 21, 2025, 06:30:06 PM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #29 on: March 22, 2025, 03:26:45 AM »
I just registered and placed my first order with David Silver Spares for the gas tank trim.  Lot of vendors selling very similar looking aftermarket tank trim but I wanted to start out with DSS and see how everything goes.  Shipping from the UK to Thailand via Royal Mail with tracking has always been very fast and reasonable price. 


Late Edit:  Price for the trim £26.00. Delivery via Royal Mail to Thailand £12.00.  Total £38.00

Super fast response from DSS, excellent communication, and quick ordering and payment processing. 
« Last Edit: March 22, 2025, 05:13:05 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #30 on: March 24, 2025, 05:10:18 AM »
Still undecided on the gas tank.  I received a reply from Yamiya today

Hello,

Sorry for the late reply.

And thank you for your understanding.

Yamiya part : G007GC

CB750 K2 TANK & SIDE COVERS SET (CANDY GOLD CUSTOM)

It cost ¥165,000JPY.

If you would like to pre-order, we can accept.

It takes about 2-3 months to get them.

Please let me know!
« Last Edit: March 24, 2025, 06:11:38 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #31 on: April 01, 2025, 11:26:12 PM »
I found this gas tank for sale on facebook.  Messaged the seller and he was quick to reply.  He told me it was a new tank from a supplier in Japan?  When I asked for a confirmation photo of the tank with his name and date on a piece of paper he offered a photo of his drivers license instead.  His grammar is not very good which is a huge red flag for me so I suspect a scammer.  His last emails to me:

We are legit I can provide you my driver's license in case of anything you get me cut

quickly followed by

I hold my driver's license I snap with it send it to you all my information are on it
« Last Edit: April 02, 2025, 04:59:39 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #32 on: April 02, 2025, 01:29:50 AM »
I did not reply to the seller's messages and about 1 hour later I received this laughable photo  ::)

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #33 on: April 04, 2025, 03:13:20 AM »
Received the gas tank trim today.  Ordered from David Silver Spares in the UK.  Excellent price, safe and secure packing,  high  quality (looks identical to the original trim and pre-curved to fit the shape of the tank), easy ordering , excellent communication, and super fast shipping and delivery.  5 star excellent vendor  :)
« Last Edit: April 04, 2025, 05:50:15 AM by kyle750 »

Offline kyle750

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Re: The CB750 gas tank dilemma
« Reply #34 on: April 07, 2025, 07:27:58 AM »
This Candy Gold Tank and Cover set located in Japan just showed up on Ebay and I would greatly appreciate your opinions.  Looks original and not perfect with some wear.  The rust to the tank is a real concern?  Price includes shipping so much cheaper than Yamiya's reproduction tank and side covers set

https://www.ebay.com/itm/376143202329

« Last Edit: April 07, 2025, 07:34:15 AM by kyle750 »

Offline Stev-o

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Re: The CB750 gas tank dilemma
« Reply #35 on: April 07, 2025, 07:43:35 AM »
This Candy Gold Tank and Cover set located in Japan just showed up on Ebay and I would greatly appreciate your opinions.  Looks original and not perfect with some wear.  The rust to the tank is a real concern?  Price includes shipping so much cheaper than Yamiya's reproduction tank and side covers set

My biggest concern would be if those sidecovers are original, the posts are very brittle and could easily break if not extremely careful removing them.
Also appears like the tank was lined?  Not necessarily a bad thing but I did have one that failed when the painter did not prep it properly.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MauiK3

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Re: The CB750 gas tank dilemma
« Reply #36 on: April 07, 2025, 07:43:57 AM »
Would be good to see a photo looking into the tank from the open gas cap
1973 CB 750 K3
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Offline Stev-o

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Re: The CB750 gas tank dilemma
« Reply #37 on: April 07, 2025, 07:48:52 AM »
Would be good to see a photo looking into the tank from the open gas cap

Look at the ebay pics...

https://www.ebay.com/itm/376143202329
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........