Author Topic: 1978 CB750F3 rebuild start (Read 8577 times)

denward17 · « **Reply #100 on:** November 06, 2023, 03:05:56 PM »

Good news!

That tank looks awesome. What color is that called and where did you get the paint?

majorzozo · « **Reply #101 on:** November 06, 2023, 03:41:46 PM »

Thanks Denward. VMR paints. Candy Presto Red. Wish I could take credit for it but I had a guy from a local body shop paint it. Came out nice...

RAFster122s · « **Reply #102 on:** November 06, 2023, 04:37:05 PM »

Very nice paint work major

majorzozo · « **Reply #103 on:** November 06, 2023, 04:52:36 PM »

Thanks Rafster. Forgot to mention that the valves were also adjusted along with the cam chain.

majorzozo · « **Reply #104 on:** November 07, 2023, 03:05:43 PM »

Happy to say I'm finished. All in just shy of 12K invested for a bike that is probably worth 7K (LOL). Not a 10 but I would say a definite 8. Rode it for 5 miles today and ran strong through all the gears. At least for the time being no fuel or oi leaks. Not sure if this normal but you could definitely feel the heat from the engine.

Looking forward to getting it registered so I can take it on a long ride. For a first time restoration I definately under estimated how much labor was involved cleaning and reconditioning everything. Well worth it though as I always wanted a clean 78F.

I think my next project will be a Z50 Minitrail just because it should be way easier. Hahahah. Thank you all on this is site for the invaluable information and assistance. Greatly appreciated...

denward17 · « **Reply #105 on:** November 07, 2023, 03:17:07 PM »

Great news!.

You ended up with a beautiful bike and hobby, you can't put a price on the joy of workmanship.

Glad you got it running.

P.S. I kept a spreadsheet on the costs of mine, and I know how you feel about having more invested than could be sold for. But now you get to enjoy it.

RAFster122s · « **Reply #106 on:** November 07, 2023, 03:36:51 PM »

They nearly always cost far more to restore than they are worth...you get the joy s d frustrations as well as the satisfaction and learning that comes with doing a restore. Many of us enjoy the project a lot and are addicted to that cycle, keeps you out of trouble and better than spending your money on lawyers or other nonsense...

BenelliSEI · « **Reply #107 on:** November 07, 2023, 06:22:07 PM »

Well done. You know your bike and you know it’s done right! Enjoy it and keep smiling! I certainly enjoyed watching your progress.

Kelly E · « **Reply #108 on:** November 08, 2023, 09:29:28 AM »

The best advice I can give about restoring bikes is don't do a spreadsheet on expenses. If you are doing it for fun a spreadsheet will kill the fun quickly. Besides the wife might find it and have a flaming hissy fit.

Most of the time I have Paul order the parts and give him cash. No paper trail to get me in trouble.

SOHC4 Cafe Racer Fan · « **Reply #109 on:** December 20, 2023, 10:04:03 PM »

FYI - I have posted this bike for nomination for Bike of the Month. Can I get someone to "second" it? If so, please post your second in the following nomination thread: http://forums.sohc4.net/index.php/topic,180400.msg2266596.html#msg2266596

newday777 · « **Reply #110 on:** December 21, 2023, 01:13:51 AM »

Quote from: SOHC4 Cafe Racer Fan on December 20, 2023, 10:04:03 PM

FYI - I have posted this bike for nomination for Bike of the Month. Can I get someone to "second" it? If so, please post your second in the following nomination thread: http://forums.sohc4.net/index.php/topic,180400.msg2266596.html#msg2266596

Yes I'll second this!

newday777 · « **Reply #111 on:** December 21, 2023, 01:16:49 AM »

Quote from: majorzozo on November 07, 2023, 03:05:43 PM

Happy to say I'm finished. All in just shy of 12K invested for a bike that is probably worth 7K (LOL). Not a 10 but I would say a definite 8. Rode it for 5 miles today and ran strong through all the gears. At least for the time being no fuel or oi leaks. Not sure if this normal but you could definitely feel the heat from the engine.

Looking forward to getting it registered so I can take it on a long ride. For a first time restoration I definately under estimated how much labor was involved cleaning and reconditioning everything. Well worth it though as I always wanted a clean 78F.

I think my next project will be a Z50 Minitrail just because it should be way easier. Hahahah. Thank you all on this is site for the invaluable information and assistance. Greatly appreciated...

It turned out great 👍 Nice job on it.

majorzozo · « **Reply #112 on:** December 21, 2023, 11:12:02 AM »

Thank you for the nomination. Surprised to just be considered. Some updates:

As I am sure like all of us just havent had the time to really ride as much as I want. Have just over a hundred miles so far and the bike had the stock sprockets which were 14 front and 43 rear. With that set-up I was taching approximately 4800 at 60 MPH. I changed the rear to 42 teeth and it came down to about 4700 at 60 then I also changed the front to 15 teeth and it came down to 4200 at 60 and approximately 5000 at 70.

Still very cold blooded as it takes about 4 miles before I can fully remove the choke. It also seems hot so I attached some stick on temperature strips to the valve cover and side cover. The valve cover runs at about 185 degrees around town and when I stop and shut the bike off it shoots up to about 225 degrees before it starts to cool. Not sure if this is too hot or not.

Still no fuel or oil leaks but I believe I am still just a tad lean. I think I am going to increase the main jets to 110 and the idle jets to 38 and see what the response is. Other thaan that everything works great.

Thanks again...

BenelliSEI · « **Reply #113 on:** December 21, 2023, 12:42:33 PM »

I like those graduated heat strips. Where do you get them?

majorzozo · « **Reply #114 on:** December 21, 2023, 01:38:30 PM »

Amazon. I think about $15.

bustech51 · « **Reply #115 on:** January 01, 2024, 11:46:12 AM »

I'm working on my 1978 cb750F engine. When I removed the head and cylinders there were 4 small o rings on 4 of the studs between the block and the cylinder. Not the larger and taller o rings. I cannot find anything in the manuals regarding these o rings. I have accounted for all of the other seals (i.e. the ones on the oil control restrictors) and the larger o rings that go between the cyl and the block.
Is there something that i am missing? They are included in the gasket kit that I bought.

denward17 · « **Reply #116 on:** January 01, 2024, 12:00:06 PM »

Quote from: bustech51 on January 01, 2024, 11:46:12 AM

I'm working on my 1978 cb750F engine. When I removed the head and cylinders there were 4 small o rings on 4 of the studs between the block and the cylinder. Not the larger and taller o rings. I cannot find anything in the manuals regarding these o rings. I have accounted for all of the other seals (i.e. the ones on the oil control restrictors) and the larger o rings that go between the cyl and the block.
Is there something that i am missing? They are included in the gasket kit that I bought.

This thread may be of some assistance:
http://forums.sohc4.net/index.php/topic,107040.0.html

majorzozo · « **Reply #117 on:** January 01, 2024, 02:26:35 PM »

I believe those are 4 each of part number 91301-410-000. Also check out this thread.

http://forums.sohc4.net/index.php?topic=136900.0

BenelliSEI · « **Reply #118 on:** January 09, 2024, 11:25:20 AM »

Quote from: majorzozo on December 21, 2023, 01:38:30 PM

Amazon. I think about $15.

Thanks! Three for $30 (in Canada). I have a part of our induction system on the race car that I am very curious about (temp). Ordered.

MauiK3 · « **Reply #119 on:** February 18, 2024, 01:28:44 PM »

Beautiful project, you will enjoy it. Great to see another brought back.

grcamna2 · « **Reply #120 on:** February 18, 2024, 03:38:13 PM »

subscribed

CB750R · « **Reply #121 on:** February 19, 2024, 12:36:22 PM »

Beauty bike congrats! I respect the full restoration effort! I too am sinking a small fortune in a late F model. Mine is far from yours in terms of originality though!

kap384@telus.net · « **Reply #122 on:** February 24, 2024, 11:00:49 AM »

Great job!! Love that you went original.

majorzozo · « **Reply #123 on:** February 25, 2024, 08:21:50 AM »

Thanks all for the kind compliments. I finally found a chrome plater who would do an exhaust. Pacific plating in Santee Ca did my headers and collars. Pricey at $450 but they were absolutely wasted and they came out like new. The muffler was not chromed but I had to have the forward end bottom welded as it was rotted out. The Delkivic I had was too loud for my old wrinkled --- and this stock set-up is much quieter.

Still fighting to get my carbs perfectly tuned but slowly gaining on it...

newday777 · « **Reply #124 on:** February 25, 2024, 04:58:47 PM »

Quote from: majorzozo on February 25, 2024, 08:21:50 AM

Thanks all for the kind compliments. I finally found a chrome plater who would do an exhaust. Pacific plating in Santee Ca did my headers and collars. Pricey at $450 but they were absolutely wasted and they came out like new. The muffler was not chromed but I had to have the forward end bottom welded as it was rotted out. The Delkivic I had was too loud for my old wrinkled --- and this stock set-up is much quieter.

Still fighting to get my carbs perfectly tuned but slowly gaining on it...

WOW
Did you have to clean the inside out?

News:

Author Topic: 1978 CB750F3 rebuild start (Read 8577 times)