Author Topic: My first Honda project 1978 CB750k (Read 7554 times)

lucky13cycle · « **on:** March 27, 2012, 04:34:59 AM »

I have built quite a few bikes but the cafe bug has bitten me. I got this 78 750k for what I thought was a fair price. I have stripped it down The bike to the bare frame. Sandblasted,cut, grinded and cleaned. I just finished painting the frame and swing arm and now its time to rebuild. Carbs were rebuilt. Replaced all the bearings on the bike. New cables brake pads etc... The is coming along. I'm just waiting for new wheels to arrive. I will post some pictures of the build as I progress.

Elan · « **Reply #1 on:** March 27, 2012, 07:33:07 AM »

cool man welcome!

ekpent · « **Reply #2 on:** March 27, 2012, 08:32:58 AM »

Are you using some kind of a frame kit where those lower tubes are cut off ?

lucky13cycle · « **Reply #3 on:** March 27, 2012, 08:41:56 AM »

The frame was cut when I got the bike. I have a kit from Cycle X that will go in the frame to reconnect the tubes.

ekpent · « **Reply #4 on:** March 27, 2012, 08:43:14 AM »

That will make it nice someday for you if you need to get to the top end.

lucky · « **Reply #5 on:** March 27, 2012, 12:12:05 PM »

If that chain that is in the photo is the old #630 chain I would get rid of it.

Looks good so far. Thanks for the photos!

Killer Canary · « **Reply #6 on:** March 27, 2012, 12:35:28 PM »

What was wrong with 630 then? Not arguing, I've read a lot of posts about it and I'm curious about what the problem is.

MasterChief750 · « **Reply #7 on:** March 28, 2012, 09:08:40 AM »

theres nothing wrong with the 630 chain, lucky just has a stick up where the sun dont shine about them. sure they are more expensive and there are less sprocket choices but good luck breaking one.

lucky13cycle · « **Reply #8 on:** March 28, 2012, 08:55:44 PM »

Thanks for the welcome. Im waiting on rims to move forward. I have the front forks on now. Engine.is.ready to go back but i need the rims. Usps is.way too slow lol. Hopefully by the.end of next week. I can have her running.

lucky13cycle · « **Reply #9 on:** April 05, 2012, 03:48:15 PM »

My project has been moving slowly. Looking for a rear wheel for a 77/78. I just finished painting my tank and tail. Now maybe I will get more motovated to finish her up. Let me know what you think of my paint choice. Thanks

KB02 · « **Reply #10 on:** April 06, 2012, 04:11:19 AM »

I like the paint. That looks nice.

lucky13cycle · « **Reply #11 on:** April 06, 2012, 11:53:38 AM »

Sandblasted all the rusty parts. Primed and painted the parts to keep the cost down. Still need a rear wheel for a 77/78 anyone out there let me know.

Killer Canary · « **Reply #12 on:** April 06, 2012, 12:28:27 PM »

Nice color scheme! Are they the same as the '79 650?

wolfbiker88 · « **Reply #13 on:** April 07, 2012, 10:50:52 AM »

wanna sell the wheels off of it?

lucky · « **Reply #14 on:** April 07, 2012, 07:41:24 PM »

Quote from: Killer Canary on March 27, 2012, 12:35:28 PM

What was wrong with 630 then? Not arguing, I've read a lot of posts about it and I'm curious about what the problem is.

The #630 chain manufactured 33 years ago is very weak and they did break all the time. It is a massively heavy chain also.
The more modern chains like the #530 chain is used on 121 Hp bikes with no problems Like the Honda VF1000R. Just better manufacturing and testing.

Many engine cases on Honda CB750's were damaged when chains broke by the #630's massive weight. The 77-78 CB750k's had a thicker engine case in that area but it still got broken.

The 1979's had a special metal plate bolted near the front sprocket to help prevent engine case damage from those massive #630 chains.

By switching to the #530 regular chain it will save a lot of weight, and is very unlikely to break like the old #630 chains did.

If you do not believe me, ask Cycle-x how many broken engine cases they see from this chain damage.

Think about this. If a chain broke and you were standing in its path, which one would hurt you the most....The heavy chain or a light weight chain?

lucky · « **Reply #15 on:** April 07, 2012, 07:44:07 PM »

Quote from: lucky13cycle on April 05, 2012, 03:48:15 PM

My project has been moving slowly. Looking for a rear wheel for a 77/78. I just finished painting my tank and tail. Now maybe I will get more motovated to finish her up. Let me know what you think of my paint choice. Thanks

The paint job is VERY good!

Boulevard_beck · « **Reply #16 on:** April 07, 2012, 08:34:05 PM »

Funny that you mention the cracked case. I picked up a 78 cb750k a couple weeks ago and it's cracked there, too. Now I know why. Too bad I just ordered a new 630 chain and sprockets, though.

lucky13cycle · « **Reply #17 on:** June 05, 2012, 07:38:55 PM »

Finally finished!! Took the first ride today. Ran great just a few small adjustments and it will be perfect!!

knowsnothing · « **Reply #18 on:** June 06, 2012, 06:10:49 AM »

congrats!! bike looks fantastic.

matt s · « **Reply #19 on:** June 06, 2012, 06:55:11 AM »

Nice looking bike - good job!

The only thing that sticks out to me is the fork gators look too "squished" together. Are those OEM?

lucky13cycle · « **Reply #20 on:** June 06, 2012, 08:44:24 AM »

Thanks for the complements

lucky13cycle · « **Reply #21 on:** June 06, 2012, 08:45:51 AM »

The gators have to be adjusted. I took care of that last night

harisuluv · « **Reply #22 on:** June 06, 2012, 09:48:42 AM »

Those carbs look familiar! I take it they are working for you. Bike is beautiful man!

lucky · « **Reply #23 on:** June 06, 2012, 12:30:36 PM »

Great looking bike!!1 I really like the paint choices.

lucky13cycle · « **Reply #24 on:** June 06, 2012, 07:49:03 PM »

The carbs worked great. I had to play with the jets because of the pipe. You did a great job! They looked brand new inside and out. Any needing a carb rebuild should talk to harisuluv

Quote from: harisuluv on June 06, 2012, 09:48:42 AM

Those carbs look familiar! I take it they are working for you. Bike is beautiful man!
[/quote 1978 Honda CB750 Cafe Racer For Sale

lucky13cycle · « **Reply #25 on:** June 06, 2012, 07:50:55 PM »

Thanks

Quote from: lucky on June 06, 2012, 12:30:36 PM

Great looking bike!!1 I really like the paint choices.

Really? · « **Reply #26 on:** June 12, 2012, 02:56:28 PM »

We are digging your bike. You have been nominated and seconded for this months BOTM. The thing you need to do is go to the link and say that you "Accept".

http://forums.sohc4.net/index.php?topic=107965.0

Ecosse · « **Reply #27 on:** June 12, 2012, 03:23:15 PM »

ya beat me to it tipper.

lucky13cycle · « **Reply #28 on:** June 13, 2012, 11:33:50 PM »

Heres some more pictures. Added tank graphics and bar end mirrors

lucky · « **Reply #29 on:** June 14, 2012, 05:43:30 PM »

Quote from: Killer Canary on March 27, 2012, 12:35:28 PM

What was wrong with 630 then? Not arguing, I've read a lot of posts about it and I'm curious about what the problem is.

They weigh a ton and if they break (and they did), it can break the engine case with that massive rotating weight. Cycle =-X uses a #520 chain on their racing CB750.
I would go with the more conventional 530 chain.

lucky13cycle · « **Reply #30 on:** June 18, 2012, 10:02:55 AM »

some more final pics

Ecosse · « **Reply #31 on:** June 18, 2012, 12:21:37 PM »

damn nice bike.

lucky13cycle · « **Reply #32 on:** June 18, 2012, 09:19:37 PM »

Thanks for the complent. I apreciate it.

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Author Topic: My first Honda project 1978 CB750k (Read 7554 times)