Author Topic: 75 CB750 restoration project. (Read 10169 times)

Antonio.guard · « **on:** July 27, 2020, 07:55:14 PM »

Here we start
Picked up this 75 CB750 from a neighbor and hoping to bring it back to her original condition, bike it’s been sitting for over 30 years the majority of the time in the garage but for the past few years outside under a tarp.
5500 original miles on the clock and he was the original owner.
A few pictures of the bike
I ll be posting more to document the restoration process, and I’m sure I ll have a lot of questions.
Thank you!

Antonio.guard · « **Reply #1 on:** July 28, 2020, 05:53:34 AM »

For the past few days I added some MMO in the plugs oil to soak for a few days.
Installed new plugs
Remove the seat
Remove the gas thank, witch it had a dent in one side that I’m hoping to pop out because the paint it’s in great shape. P.O. left gas sitting in the tank so it’s going to need a good cleaning it’s ruff in there.
I ll post some pictures when I get to it
Remove the seat, witch it’s in great shape it’s going to need a good cleaning but it looks awesome.
Removed the exhaust, unfortunately it’s not usable it rusted from the inside out, I ll be looking for a stock one I really like the look. If anyone has one for sale please let me know.
Next on the to do list
Oil change
inspect, adjust, and clean points
Remove carbs and air box
Then I ll try to turn her over with some starter fluid and see what happens

BenelliSEI · « **Reply #2 on:** July 28, 2020, 07:20:11 AM »

Antonio...... if that mileage is original and the engine is free (turns over on the kicker?), it won’t take much. I’d put some oil down the plug holes and keep kicking it over for a while, before trying the electric star. You want to make sure the bores and rings are well lubricated before any serious starting attempts.

Antonio.guard · « **Reply #3 on:** July 28, 2020, 09:12:15 AM »

Thank you so much for the reply
Yeah original miles
I did put some marvel mystery oil in the plugs holes a few days ago when I picked her up.
Engine it’s free I have been using like you said the kick start with my hand to rotate the engine, been doing every morning for the past few days and probably just do that for this week. I do want to do a oil change and filter change sometime this week also. And just like you said let those pistons and rings soak for a while.
I ll remove the carbs they definitely need cleaning and rebuilding.
I ll work on trying to clean out the tank this week while I got some time.

Antonio.guard · « **Reply #4 on:** July 28, 2020, 12:48:13 PM »

Here are some pictures of the tank before and after I soak the inside with some degreaser and hot water and rinse it out with the garden hose. I ll put some evaporust next and let it sit for a few days. There is still a lot of rust at the bottom so hopefully the evaporust will take care of must of it. Also got to take care of the dent I would really like to be able to use the original paint.

BenelliSEI · « **Reply #5 on:** July 29, 2020, 05:57:26 AM »

The tank looks good! Any specialty “paintless dent removal” shops around you? I’ve seen some pretty amazing work by those guys. If the paint isn’t cracked, it can be saved...... the down side is your paint is 40+ years old and a bit brittle...... good luck!

Antonio.guard · « **Reply #6 on:** July 29, 2020, 06:09:40 AM »

Thank you for the suggestion, it’s actually a good idea I ll look into it.
No cracks in the paint, I know it’s an old tank but I love the original paint so hopefully can be saved.

MauiK3 · « **Reply #7 on:** July 29, 2020, 09:55:33 AM »

If you must repaint you should be able to find that color.

Antonio.guard · « **Reply #8 on:** July 30, 2020, 08:22:54 AM »

Looking for a set of tires
Anyone running shinkos? A lot of people run them on the cx500forum what you guys think?
Also should I replace chain and sprockets or just clean and lube?
Help it much appreciate!!!!
Thanks Antonio

MauiK3 · « **Reply #9 on:** July 30, 2020, 09:37:54 AM »

Inspect the chain and sprockets, if there is much wear replace them.
Maybe ride it a bit to see how it looks and sounds, look for stiff links

Antonio.guard · « **Reply #10 on:** July 30, 2020, 11:32:04 AM »

Thank you for the reply

Antonio.guard · « **Reply #11 on:** July 30, 2020, 11:32:59 AM »

I ll give it a good cleaning, look for stiffness and lube and see

Antonio.guard · « **Reply #12 on:** August 09, 2020, 07:50:03 PM »

As suggested by benellisei I looked into a dent removal shop, I did find one and dropped of the tank last week. The owner said that he should be able to remove the dent hopefully. I’m picking it up tomorrow or the next day I ll be sure to post some pictures. I did do a oil change this past week, removed the carbs and sprayed some starter fluid in the intake and she chugs. I’m now in the process of cleaning and rebuilding the carburetor so hopefully once that’s done she ll fire up. I just realized I didn’t take a picture of the carburetor to show how bad they were but they are all cleaned now ( I ll post some pictures along with the tank) just waiting on a rebuild kit to reassemble. I was hoping to use all the original brass but unfortunately everything was just too ruined from gas sitting there for so long.
I did order tires, a new air filter, and a new petcock. Meanwhile I have been polishing some of the chrome to see what can be salvaged. Once carbs are on I ll remove the wheel and get them ready for the new tires, clean them and check bearings and clean and check rear brake.i ll do the front brakes at a later time, figure I ll start from the back and move my way forward.
Thank you!! Opinions and suggestions always appreciate.

Antonio.guard · « **Reply #13 on:** August 11, 2020, 09:41:39 AM »

Picked up the tank yesterday and I’m super stoked how it turned out.
I ll be posting some more pictures when I clean the inside and install the new petchock.
Carbs are clean and ready to be rebuild waiting on the kit to arrive.
I ll add some more pictures once I get them rebuild and on the bike.

rocket johnny · « **Reply #14 on:** August 11, 2020, 11:42:43 AM »

your tank looks super ! when you have your tires off , go ahead and do wheel bearings ,, easy to do and cheap .

Antonio.guard · « **Reply #15 on:** August 11, 2020, 12:00:44 PM »

Thank you !! It needs a bit of inside cleaning but I think evaporust will do the trick. I used it on my cx and what a difference.
Yeah 100%, I’m planning on update all wheel bearings and head bearing, figure it’s time after 40+ years.

gpzkat · « **Reply #16 on:** August 11, 2020, 03:51:50 PM »

I have a dent on mine in similar location, it's taken to bare metal now and I see a few dings and dents and would prefer not to bondo it, so I'll look into this. I have had good luck with paintless on cars. Wish it had paint like yours already, that's going to be an expensive job no matter if I DIY or have done.

Antonio.guard · « **Reply #17 on:** August 11, 2020, 05:09:11 PM »

Yeah, I honestly didn’t know much about this dent removal places, it was suggested by a member, but as I said I’m very happy with the results. I was going to try myself but it’s something that I have never done and really wanted to preserve the paint and decals. And it would had cost me as much just to buy the tools and probably I would had ruin it and ended up painting anyway lol
So for $100 was definitely worth it.
I ll post some close up pictures in the next few weeks

Antonio.guard · « **Reply #18 on:** August 14, 2020, 08:28:46 AM »

Carbs are back on the bike, cleaned and rebuild and bench synced. Waiting on an air filter to arrive.
Still need minor adjustments but she idles nice.
Next on the list tires, rear break, and chain.

chiefum · « **Reply #19 on:** August 15, 2020, 09:02:35 AM »

Looks like a great project. That tank came out wonderfully.

Antonio.guard · « **Reply #20 on:** August 15, 2020, 12:30:22 PM »

Thank you! Should have new tires installed along with new bearings and chain by the end of the month

johno · « **Reply #21 on:** August 17, 2020, 05:55:03 AM »

The pointless dent repairers are awesome, took my sons car to get 3 bad carpark dents out and they done a perfect job, so I took my early 50's Jawa tank which is very very thick steel compared to our jap tanks and when they seen it they said likely very difficult job, when I picked the tank up it was perfect, mine was $100. as well. Money well spent that's for sure.
cheers Johno

newday777 · « **Reply #22 on:** August 17, 2020, 06:57:05 AM »

That is a great find you have and are doing a great job reviving it.
I have a 75 that a friend had and I bought off his estate with 8,000 miles on it. He stored it properly so it wasn't too hard to get back on the road. I actually rode it back in 1976 when the original owner had it and I had one identical to it. So fun to have it back on the road.

Antonio.guard · « **Reply #23 on:** August 17, 2020, 03:56:36 PM »

Wow!! Your bike looks awesome!!
Thank you !

gpzkat · « **Reply #24 on:** August 17, 2020, 05:39:47 PM »

I have my CB750 tank down to bare metal and it's got some dents, I hate to lay filler on it and would probably do a bad job on it.. Called a local guy and he hadn't invested in a jig/setup for tanks but gave a recommendation for a place 45 mins away that does great work. But I can't get anyone to look at me sideways for $100 around here.

Quote from: Antonio.guard on August 11, 2020, 05:09:11 PM

Yeah, I honestly didn’t know much about this dent removal places, it was suggested by a member, but as I said I’m very happy with the results. I was going to try myself but it’s something that I have never done and really wanted to preserve the paint and decals. And it would had cost me as much just to buy the tools and probably I would had ruin it and ended up painting anyway lol
So for $100 was definitely worth it.
I ll post some close up pictures in the next few weeks

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Author Topic: 75 CB750 restoration project. (Read 10169 times)