Author Topic: Honda CB750K8 CAFE project (near completion!)  (Read 35163 times)

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Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #125 on: January 05, 2012, 10:20:09 PM »
AM... lucky is right. If the rear of your exhaust has any flex to it that will distort the connection of your head, header, and copper exhaust gaskets. At the very least you'll get leaks from that joint. You would be better off attaching the back of your header to the frame than having that muffler attached in the manner it currently is.
Just look at the way old gp bikes have their exhaust hung from a point as vertical as possible on the frame from the muffler bracket. PROTECT YOUR HEAD!!


Win some lose some, it's all the same to me.
I'm pretty sure the bar we welded on there is perfect no? It's the same as the #$%*ty vertical bar they provide you just at an angle that puts not tension on the muffler at all. You still think it'll be a problem? I really don't think it will personally but I'll have to have a discussion with David on it see what he and everyone at the shop thinks.

Offline MCRider

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Re: Honda CB750K8 CAFE project
« Reply #126 on: January 06, 2012, 06:45:21 AM »
The bar on the rt side running with the swingarm, not quite parallel? Looks fine to me.

Traditional would be to hang it from the top shock mount. But the muffler doesn't know where the mount is, as long as its solid to the frame.
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #127 on: January 06, 2012, 06:53:46 AM »
The bar on the rt side running with the swingarm, not quite parallel? Looks fine to me.

Traditional would be to hang it from the top shock mount. But the muffler doesn't know where the mount is, as long as its solid to the frame.

Yeah, the Kerker I chose came with the black mounting bar. In my opinion it's not aesthetically pleasing as it covers up the right shock. I think keeping it welded at that angle and having it powder coated with the frame only hides the bar more. I don't even think it'll be an issue.

Now removing the riveted Kerker logo plate on the other hand...

Offline Really?

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Re: Honda CB750K8 CAFE project
« Reply #128 on: January 06, 2012, 09:26:02 AM »
WoW, nice bike AM!
I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline Tintop

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Re: Honda CB750K8 CAFE project
« Reply #129 on: January 07, 2012, 08:00:32 AM »
I wouldn't worry to much about your muffler support AM, I've seen race bikes were the whole system is only held on at the head.  Baring in mind, they are also not running a heavy street muffler.  My only question would be the potential for the support to crack were it is welded to the frame, from vibration.  A small gusset there would eliminate that issue.
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline Blackandsilver

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Honda CB750K8 CAFE project
« Reply #130 on: January 09, 2012, 11:44:57 AM »
Tintop has a good idea there.(gusset). If you want to test it just push down on the bar you attached. If it flexes at the end then its not doing much to keep the flex away from your head. The gusset will also help with cracking from vibration.
I still think you'd be fully sorted by putting an invisible bracket on the bottom of your frame to bolt the back of your header to. If that's solid then your muffler can bounce around all it wants.


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Offline Blackandsilver

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Honda CB750K8 CAFE project
« Reply #131 on: January 09, 2012, 11:45:14 AM »
Tintop has a good idea there.(gusset). If you want to test it just push down on the bar you attached. If it flexes at the end then its not doing much to keep the flex away from your head. The gusset will also help with cracking from vibration.
I still think you'd be fully sorted by putting an invisible bracket on the bottom of your frame to bolt the back of your header to. If that's solid then your muffler can bounce around all it wants.


Win some lose some, it's all the same to me.
I will never die

Offline FrankenFrankenstuff

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Re: Honda CB750K8 CAFE project
« Reply #132 on: January 09, 2012, 12:14:52 PM »
yowza (subsrcibed)

Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #133 on: February 23, 2012, 11:14:08 PM »
Newest photos:


















Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #134 on: February 23, 2012, 11:21:58 PM »
So Dave just sent me these updates as there was a lot of trouble with the Dresda swing arm not aligning properly, so unfortunately we had to go back to the original swing arm. At first I was kind of bummed when he explained why but now that I see it on the bike I actually like it more. It maintains being a Honda which is nice.

Dave is such a perfectionist it's insane. Most people would just throw the Dresda on and be like, "it's on" but he checked it and didn't feel it'd perform to function and also run the risk of bottoming out. I love his honesty.

Speaking of, he had the tank wrapped and put in his office to avoid dinging it and he called me to be explain that a torque wrench (of course) hit the tank still and needed to fix the tank. Not only did he take care of it himself, the painter, took it back and did an even BETTER job free of charge. He even redid the seat and headlamp just in case the paint wasn't exact. These guys are the most on point I've encountered in pay for work scenarios and to have both of them on the same project is such a blessing. Obviously you might know David from E3MC on the forums but the painter is Drmotor1.com. Super reasonable, hard working, honest and got my tank done over Christmas weekend in less than 4 days and said if I wasn't satisfied he'd do it again free of charge (and he did though it was our bad). He's in the NYC area.

Bike is looking great, cannot wait to ride the thing, fortunately it's not even that cold out.

Offline brandEn

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Re: Honda CB750K8 CAFE project
« Reply #135 on: February 24, 2012, 03:17:38 AM »
#$%*IN! Black and blue is one of my favorite combos. Good job!

Offline Blitzburgh207

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Re: Honda CB750K8 CAFE project
« Reply #136 on: February 24, 2012, 06:13:46 AM »
How did I not see this before?? Great project man!
1978 CB750 K8

Offline Really?

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Re: Honda CB750K8 CAFE project
« Reply #137 on: February 24, 2012, 08:57:26 AM »
I see BOTM in your future!

Btw, I read through your thread and hope I didn't miss it but what rim/tire height/width did you go with both front and back?
I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline Tintop

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Re: Honda CB750K8 CAFE project
« Reply #138 on: February 24, 2012, 12:14:37 PM »
That has really come out nice.  Your painter did a great job. 8)
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #139 on: February 24, 2012, 08:31:11 PM »
That has really come out nice.  Your painter did a great job. 8)

Yeah he did. And I really respect how much he cared about how I felt about it. This guy is tops, he'll be successful in the long run.

Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #140 on: February 24, 2012, 08:35:55 PM »
I see BOTM in your future!

Btw, I read through your thread and hope I didn't miss it but what rim/tire height/width did you go with both front and back?

Hey thanks! As far as the tires and rim sizing I just got the same size as stock and I talked  with buchannon spoke and rim about what to get. Forgot the size off top, it's been so long and this build has been such an adventure of epic proportions for me. Talk about getting in too deep for a beginner who wanted everything perfect. I learned a lot. I'm still glad I didn't just buy a completed bike because I have learned so much.

Offline Really?

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Re: Honda CB750K8 CAFE project
« Reply #141 on: February 24, 2012, 09:35:11 PM »
For a beginner, you went above an beyond and created a really nice bike.  You will be able to talk about this bike for the rest of your life.  Not many people can say they accomplished something on this level but you can.  I really like what you have built.

Thank for the info too!
I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline Roach Carver

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Re: Honda CB750K8 CAFE project
« Reply #142 on: February 25, 2012, 05:27:25 AM »
On a side note, you need a lock nut on that front brake adjustment screw where it goes through the leg.

Offline DannyBhoy

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Re: Honda CB750K8 CAFE project
« Reply #143 on: February 25, 2012, 06:15:44 AM »
WOW, I just jumped on the project train after a year away. First Saturday morning that the 3 kids have no ice time.
Great build AM. I have a 78k as well. During the summer I aquired a 78 F and a 70 motor as well. Thanks for posted your hard work and I look forward to the finish. I guess its time to get the heat turned up in the shop and start spin'n wrench's again.
Cheers
The older I get the faster I was.

Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #144 on: February 25, 2012, 09:18:12 AM »
On a side note, you need a lock nut on that front brake adjustment screw where it goes through the leg.
Hey, thanks!

Offline gnarlycharlie4u

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Re: Honda CB750K8 CAFE project
« Reply #145 on: February 29, 2012, 12:17:44 PM »
It's been a while since I posted in here. (last time was a really long derail about sprockets)
I just wanted to pop in and say you have made some AWESOME progress. The bike looks wonderful.

Where did you get those plugs for the cyl head and engine case? (from the 1st page)
I'm about to paint and those look like they could have saved me a ton of masking.

Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #146 on: March 04, 2012, 07:43:10 PM »
New pics





I'm sure most people wouldn't even bother, but I absolutely have to remove that kerker logo. Any ideas? Dave thinks it's glued down under the rivets. He suggested I design something to put over it. I'm kind of at a loss for ideas at this point.



















Offline AnthonyMichael

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Re: Honda CB750K8 CAFE project
« Reply #147 on: March 04, 2012, 07:44:18 PM »
Also thinking of going back to the original clear/brown handgrips. I'm going to wait to see how the seat leather looks on it first.

Offline Dyrden

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Re: Honda CB750K8 CAFE project
« Reply #148 on: March 04, 2012, 10:03:33 PM »
Thats a beautiful bike.  Im using your engine photos to inspire the same work and attention to detail on mine.

Offline Lostboy Steve

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Re: Honda CB750K8 CAFE project
« Reply #149 on: March 05, 2012, 07:49:57 AM »
That paint probably looks #$%*ing amazing in person and the pictures hardly do it justice I'm sure.
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