1980 CB750K Cafe Project (hopefully)

[Griffin]

Frame is finally done. Here's my new rear master cylinder installed to the new mounts.

[TOOLS1]

Looks good, but I am getting dizzy looking at the sideways/upside down pictures.
TOOLS

[Griffin]

Sorry it's my phone doing that. They look right but show up sideways when I post them.

On Jun 8, 2016 6:06 PM, "TOOLS1 [via Honda CB750'S]" <[hidden email]> wrote:

Looks good, but I am getting dizzy looking at the sideways/upside down pictures.

TOOLS

Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

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NAML

[Griffin]

Just had an interesting conversation with Ken from Cycle Exchange about Carbs.  Surprisingly he didn't recommend the dual carb setup for the DOHC.  He say they will work but the manifold was designed for the SOHC so there is very little room for filters.  He also said you could use the stacks but it's better to run filters. The more interesting thing is that he said there's really no performance increase in the dual carb setup on a DOHC. So in short they work if you want them and certainly look better than the CV carbs with an airbox but if you want performance you should get a set of CRs.

[TOOLS1]

The Cycle=X duel carb set up will work with the DOHC, and SOHC without any clearance problems. You just use two of the stock carb boots to go between the manifold and carb instead of the straight ones that come with the kit. This way the carbs go back straight between the frame rails. However there other manifolds on the market that will work. I believe Speedmoto has them.
TOOLS  

[Griffin]

I was pretty bummed when he said I wouldn't get a performance gain. Great idea to use the stock boots like that. Sounds like you could get nice filters on that way. I really like the idea of a dual carb setup and it's a lot cheaper. I also like their manifold better than speedmotoco.

As for using CRs if I do shell out the cash. Do you know if my stock throttle housing, throttle cable and choke cables would work with them? Also is there any real benefit to using K&N filters over a cheaper set?

On Jun 10, 2016 5:14 PM, "TOOLS1 [via Honda CB750'S]" <[hidden email]> wrote:

The Cycle=X duel carb set up will work with the DOHC, and SOHC without any clearance problems. You just use two of the stock carb boots to go between the manifold and carb instead of the straight ones that come with the kit. This way the carbs go back straight between the frame rails. However there other manifolds on the market that will work. I believe Speedmoto has them.
TOOLS  

Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

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NAML

[Griffin]

I got the rear put back together. I'm using the rear shocks from an F model of the same year, they cleaned up nice.

 

[Jesper777]

Lookin good.
Why did you put the rear break fluid thingy on the other frame part insteadof the original spot?

[Griffin]

There was no original spot. The K model had a drum rear brake. I'm using parts from an F model to get disk brakes and mag wheels. My wire wheels were beyond my ability to restore. I had to modify the frame for a new rear MC and added a bolt-on point for the fluid bowl.

On Jun 11, 2016 5:03 AM, "Jesper777 [via Honda CB750'S]" <[hidden email]> wrote:

Lookin good.
Why did you put the rear break fluid thingy on the other frame part insteadof the original spot?

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NAML

[Griffin]

I have a rolling chasis now! Pretty excited about all the recent progress. I got as much done this week as I could knowing I have to travel next week.

Is was getting dark when I took this pic. Man I love the way it's turning out!

[Griffin]

I put the handle bars on and I'm working on wiring up some aftermarket switches. I think I've got it figured out but I'm hoping someone can confirm. My new switch is different than stock. The turn signals have one wire in and one out to left and one to right. It matches color for color on those and I can use the diagram to track the "in" wire from the flasher and the "out" wires to the turn signals. It does not have a place for the lb/w, o/w, or br/w wires. Based on the diagram and taking apart the stock one I can see they all use to be switched. Can I connect those wires together? I believe it will still work that way. The only difference is that both sides of circuit are typically open and closed by the signal switch. If I ran one side all together only one side of the circuit would be open and closed at the switch. Will this still work correctly? Am I missing something?

[shinyribs]

I can't recall offhand the exact colors, but there are duplicate wires coming out of the stock switchgear in regards to turn signals. There will be two ''out- going'' feeds for left or right( hope that makes sense), but the duplicate was used solely for the turn signal indicators on the dash. You;ll probably have to poke around in the FSM and decipher the wiring diagram to determine which wire actually went to the blinker itself, and which wire was for the dash indicator.

[shinyribs]

Oh, and on the performance gains of different filters and such..yeah, the stock system is sorta bulky and hard to deal with come maintenance time, but they work reliably and aren't restrictive at all. Especially on a stock engine. For daily ridden reliability, you can't beat a stock Honda.

[Griffin]

All the wiring for new gauges and handlebar controls are done. Looking forward to pluging it all back in to see if it works.

[Griffin]

Forgot one pic

[TOOLS1]

Kind of reminds me of Johnny#5 from Short Circuit.
TOOLS

[Griffin]

Haha it does!

On Jun 20, 2016 7:24 PM, "TOOLS1 [via Honda CB750'S]" <[hidden email]> wrote:

Kind of reminds me of Johnny#5 from Short Circuit.
TOOLS

Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

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If you reply to this email, your message will be added to the discussion below:

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NAML

[Griffin]

Well I had a few moments of terror today when a cam holder bolt broke off as I was torquing it to spec.  I never expected that.  I thought an aluminum head would strip before a bolt broken. Especially under 12 ft/lbs or torque. It must have been weak already.  After a few things that didn't work, I was able to drill a hole in the bolt and tap a small screwdriver in to unscrew it.  Now there is one stainless steel bolt that doesn't match the others.  That's going to bug me for a while but it was better than ordering one and waiting for it to come it.

Another problem was that I couldn't remember exactly how the oil pool caps went in.  I think they point up and sort of come around the cam shaft holders in the center on the intake side.  The shop manual doesn't have a good pic but that's the only thing that makes sense.  It puts one edge pretty close to the cam lobe on either side.  If I've got it wrong please correct me.

I'm painting the cam cover now so it won't go on until tomorrow.  That should complete the engine to the point where I can put it back in the frame.

[Griffin]

Engine is ready to go back in the frame.

[Griffin]

The Motor is back in and I got the chain installed.  Had a heck of a time with the chain. I thought I could separate it with a chain breaker but I ended up breaking the chain breaker instead of the chain.  That is one tough chain!  After getting a new chain breaker under warranty I took a grinder to the chain before using the chain breaker and that worked well.

Here is my remaining to do list.

Torque the drive sprocket bolt
Torque the swing arm nut and motor mounts
Install the Brakes
Install Wiring Harness (get all the stuff to fit under the seat)
Cut out a place for the electronic components from the seat mounting board
Test electrical make sure I wired it all correctly and fix whatever I screwed up
Install Exhaust
Install Spark plugs
Install Carbs (on order)
Install Headlight (getting painted)
Install Tank (getting painted)
Install Seat (getting painted)
Install Fender (getting painted)
Make a seat pad and install it

I think that's it