Author Topic: CB500 K1 Restoration  (Read 101 times)

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Online Tumpe

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CB500 K1 Restoration
« on: December 14, 2025, 02:00:26 PM »
Greetings from Finland! I got encouragement to start project thread from another user here, so here goes.

I spotted the bike for sale on finnish classic bike forum at spring. At first I thought it's not what I'm looking for but after hearing the price and asking for few questions from PO I decided to buy it.  First picture is on purchase condition.

At first I thought this wouldn't be nut and bolt restoproject, but my OCD kicked in pretty quickly. I wanted to get original green paint scheme, and it would have look out of place with patina at bike elsewhere.

Frame was in good shape and mostly in original paint, it went to powdercoating after documenting the warning label positions etc. In Finland there have been some idiotic law in 70s,  that has forced sellers to weld covers to near steering lock on new bikes. I cleaned those off with grinder before taking  frame to paint shop.

 Bolts and springs etc. were also mostly original. After disassembly I send them to zinc-plating. I ordered the tank and side cover paints from cb-four.de, along with new instrument mounting rubbers and few other little things.

I sandblasted the tank to remove PO's black metallic paint. Noticed the bike had been originally gold doing that. I wanted to get Jet green scheme as mentioned earlier, because I think it's nicest of the original colors and goes better with chrome than gold. I sealed the tank with GPL-S epoxy paint and filled the couple of dings with filler. Right side cover was cracked and I ordered new from cb-four.de, left side was intact so it needed only quick sanding and primer. Then off to the paint shop they went.

I disassembled the gauges and painted the outer ring with satin black, faces were good with cleaning and wax on them. Wheels were also disassembled and aluminium parts cleaned of factory varnish and slightly polished. Rims I ordered from Cmsnl and David silver. ( Hint: DS is much cheaper option for front rim) I laced wheels with original newly plated spokes, have yet to order couple of rear spokes before truing.

Last picture is how the bike looks now,  got the tank and covers back from paint shop and they did a splendid job!
Have to acquire new tank badges somewhere, PO had changed them to wrong ones. Side cover emblems were in good shape, needed just dab of black paint to the edges. Next i need to rebuild front forks, already have them disassembled. New boots, top caps and seals and they're good to go. Original headlight holders are little crusty, but bearable on outside. Have to clean them in citric acid and check if they would be OK to fit back.





« Last Edit: December 14, 2025, 02:22:15 PM by Tumpe »

Offline HondaMan

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Re: CB500 K1 Restoration
« Reply #1 on: December 14, 2025, 04:08:01 PM »
Wow, nice work!
I gotta follow this... :)
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline newday777

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Re: CB500 K1 Restoration
« Reply #2 on: December 15, 2025, 01:42:40 AM »
It is coming along nicely. The color on the tank and side covers looks great.

Is the trailer yours? The lid/cover is interesting that the bike fits under the lid. Do you have more pictures of the trailer?
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

Online Tumpe

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Re: CB500 K1 Restoration
« Reply #3 on: December 15, 2025, 03:34:11 AM »
Thank you both! Yes the trailer is mine. They are quite common here in Finland, I think its finnish-made and I don't know if they export these.


This is quite similar than mine: https://trailerman.fi/tuote/respo-750m301l150-42-jarruton-kuomukarry-750kg-150x300x42/

Offline newday777

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Re: CB500 K1 Restoration
« Reply #4 on: December 15, 2025, 06:51:54 AM »
Thank you both! Yes the trailer is mine. They are quite common here in Finland, I think its finnish-made and I don't know if they export these.


This is quite similar than mine: https://trailerman.fi/tuote/respo-750m301l150-42-jarruton-kuomukarry-750kg-150x300x42/
I like it! Very versatile design too.
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