Author Topic: 1975 CB750 Restoration (Read 4076 times)

derbydave · « **on:** April 14, 2017, 10:22:00 AM »

I recently purchased a non running 1975 CB750 for $250. I plan to restore it as close to original as possible. There are a few missing and broken parts but it is mostly all there. Should be a fun project.

SOHC4 Cafe Racer Fan · « **Reply #1 on:** April 14, 2017, 10:24:15 AM »

Nice buy especially if it has a title.

Is the motor free or seized?

derbydave · « **Reply #2 on:** April 14, 2017, 10:27:04 AM »

Motor is seized and no Title (yet). In KS the bike qualifies as an antique which allows me to get a title with just a bill of sale and VIN inspection.

SOHC4 Cafe Racer Fan · « **Reply #3 on:** April 14, 2017, 11:34:08 AM »

Quote from: derbydave on April 14, 2017, 10:27:04 AM

In KS the bike qualifies as an antique which allows me to get a title with just a bill of sale and VIN inspection.

That's a plus.

I'm sure calj737 will chime in on his "cocktail" for freeing up a seized motor.

CycleRanger · « **Reply #4 on:** April 14, 2017, 08:58:09 PM »

Looks like you have a good candidate there!

Jnel · « **Reply #5 on:** April 15, 2017, 08:27:02 AM »

Marvel mistery oil and #2 fuel oil. Fill the cylinder thru the plugs holes. Let it sit for as long as you can. Keep topping it off. This worked for me on several occasions. Be patient. Try to turn it by hand. Both ways.

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Stev-o · « **Reply #6 on:** April 15, 2017, 08:49:02 AM »

Quote from: Jnel on April 15, 2017, 08:27:02 AM

Marvel mistery oil and #2 fuel oil. Fill the cylinder thru the plugs holes. Let it sit for as long as you can. Keep topping it off.

Or ATF/acetone....worked for me. After setting a few days, put in 3rd gear and rock it back and forth. Had a 17' long geyser shoot out of it, set the record!

Jnel · « **Reply #7 on:** April 15, 2017, 01:22:40 PM »

Yes, this is not a indoors sport. Definitely do the final move outsid. Don't forget your safety gear, and do a JSEA pror to starting the job.

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derbydave · « **Reply #8 on:** April 25, 2017, 07:34:49 PM »

I got the engine freed up this evening. I took the stator cover off and used my breaker bar on the end of the crank to rock it back and forth until it freed up. Didn't take near as much as I was expecting.

Stev-o · « **Reply #9 on:** April 25, 2017, 08:41:42 PM »

Good news

calj737 · « **Reply #10 on:** April 26, 2017, 04:42:02 AM »

It would still be wise to pour a cocktail down the plug holes to eat away at the rust that accumulated in the cylinders (if you didn't).

Don't know your full plans for the restoration, but member Noblehops (Nils) runs RestoCycle and provides a vapor blasting service to restore your engine cases and carbs and hubs to an immaculate level of beauty!
https://www.restocycle.com

Many members have used his service and none have regretted it

derbydave · « **Reply #11 on:** April 26, 2017, 07:10:46 AM »

I put PB Blaster in the cylinders when I first got the bike. I will probably add some MMO later. Since I am planning a full restoration the engine is going to come out of the frame and get a full inspection and a rebuild if the inspection warrants it.

Jnel · « **Reply #12 on:** April 26, 2017, 07:50:26 AM »

Good job. What was the mixture you went with? PB Blaster alone?

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derbydave · « **Reply #13 on:** April 26, 2017, 07:53:11 AM »

Yup, just straight PB Blaster.

derbydave · « **Reply #14 on:** April 26, 2017, 07:38:30 PM »

My Honda loaded in the back of my Honda ready to go get a VIN inspection tomorrow and hopefully an antique title.

derbydave · « **Reply #15 on:** April 28, 2017, 03:00:20 PM »

So when I went to get my VIN inspection I found out that my 74 is really a 75. I was unaware that despite the 7/74 build date it is considered a 75 Model year. Whoops

Stev-o · « **Reply #16 on:** April 28, 2017, 03:56:10 PM »

Quote from: derbydave on April 28, 2017, 03:00:20 PM

So when I went to get my VIN inspection I found out that my 74 is really a 75. I was unaware that despite the 7/74 build date it is considered a 75 Model year. Whoops

Hodel didnt use "model years", you either have a K4 or a K5, the VIN will help you determine that.

Now, you could have had a K4 built in '74 but was sold and titled in 1975, with a title stating it's a '75. Got it?!

derbydave · « **Reply #17 on:** April 28, 2017, 04:22:19 PM »

It is a K5. I did some research and looked up the model differences. The turn signals, indicator light panel, and rubber tipped kickstand are all K5

That being said Kansas designates it a 1975 since it was built after May 74

Tews19 · « **Reply #18 on:** May 01, 2017, 04:14:58 PM »

Subscribed

derbydave · « **Reply #19 on:** May 10, 2017, 02:44:16 PM »

The bike is no longer Titleless. I successfully got my Antique title today from the DMV. The lady doing the title work gave me a funny look when I didn't have the original title for the bike but with some help from a supervisor and after looking up the antique title rules (which I printed just in case) all was good. She said hey I learned something today.

I can begin the real work now that all the paperwork is out of the way.

Stev-o · « **Reply #20 on:** May 10, 2017, 04:33:28 PM »

What is an "antique title"?

I've made them scratch their heads and grab the big book before too!

derbydave · « **Reply #21 on:** May 10, 2017, 05:26:35 PM »

Antique titles and the associated plates are a special class of registration reserved for vehicles 35 years or older in Kansas. The vehicles major components must be from the same model and vintage for the year of the vehicle, for example a modern drive train installed in an antique body or frame does not qualify. The upside is the taxes are only $17.00 per year and I get a special antique plate when I put it on the road or I can use a plate from 1975 and register the plate so I can legally display the period correct plate.

News:

Author Topic: 1975 CB750 Restoration (Read 4076 times)