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Author Topic: CB750 F to K  (Read 2937 times)

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Offline GOONZ

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CB750 F to K
« on: February 19, 2016, 11:59:42 AM »
It all started when I Payed way to much for a non running CB750F1 in September 2013.
I can't remember why, but I was dedicated to build myself a motorcycle with a 4 in line engine.

How I bought her




Couple of hours in my possession



Chop chop


Stripped the paint of the tank and fabricated somewhat of a seat


Pulled the motor. At first the idea was to only refresh the top end.


But after some reading I decided to to do the complete engine.


After soda blast


I wasn't a big fan of the F tank. Found this K tank for 30 euros!  ;D


My first idea was to hide the oil tank under the seat. Therefore I needed seat with some room





Then it was time to seat some valves





I didn't like how the seat looked and at the time I couldn't find enough info for building myself a oil tank.
So change of plans. This is where I concluded I liked the tracker look




Bought a loop, loop didn't fit. Apparently F frames are not as wide as others?




Bought myself a cheap MIG welder second hand and made the loop fit



Time to rebuild the motor! I did everything that needed to be done. New bearings, new stretchbolts, new chains, new tensioner,...





Made some new suspension mounts



I really hate the original welds, but I don't have the skill to re-do it all. It's also not necessary, I'll get over it  :)




Got a great deal on a GSXR front end!



Top triple mod for the handlebar clamps



Deglazed the jugs






The previous front end I scored came out to be from 1998. As I wasn't sure I was going to get that to work I opted for a 2005 fork



Ordered a Cognito Moto hub & stem for the conversion


Had some modern wheels made


Front Cognito Moto hub, rear stock F1 hub. I'm pretty sure a lot of people are not going to support my tire choice  ;D


First real mock up!






The time I tried to weld aluminium with steel on a MIG wilder  :o ::)


Rear sets


Worlds most simplest brackets




As much as I like Cognito Moto's stuff, shipping and taxes are heavy. Waaaay heavy!

So I tried to fabricate my own tank








Made a couple of mistakes. Started with hot rolled steel. Cold rolled steel seems to be the standard for oil tanks.
I cannot figure out if the inside needs to be coated to prevent rust. Maybe the oil takes care of that?
I followed a fellow DDT'er his measurements. It stated a 3,2qt capacity. After building the thing it only fits 2qt's  :o
Back to the drawing table with it.

I have been reading a lot about POD filters. I know, I know..
Tried the stock filter today, I just don't like the look.


That's it for now. I'll try to update regularly! Lot's of things on my to do list!
« Last Edit: February 20, 2016, 04:44:49 AM by GOONZ »
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Offline flybox1

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Re: CB750 F to K
« Reply #1 on: February 19, 2016, 12:39:55 PM »
you had a busy day  ;) ;D
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline GOONZ

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Re: CB750 F to K
« Reply #2 on: February 19, 2016, 12:47:06 PM »
Quote from: flybox1 on February 19, 2016, 12:39:55 PM
you had a busy day  ;) ;D

Haha, it's over a time span of 2 years  ;D
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Offline beemerbum

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Re: CB750 F to K
« Reply #3 on: February 19, 2016, 12:49:08 PM »
Saw this bike near my house. Beautiful oil tank fabrication. Wish it were mine. Looks like what you are after.
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Offline GOONZ

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Re: CB750 F to K
« Reply #4 on: February 19, 2016, 12:54:43 PM »
Quote from: beemerbum on February 19, 2016, 12:49:08 PM
Saw this bike near my house. Beautiful oil tank fabrication. Wish it were mine. Looks like what you are after.

That is indeed what I'm after! Thanks!
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Offline 70CB750

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Re: CB750 F to K
« Reply #5 on: February 19, 2016, 01:20:38 PM »
Sweet build, Goonz!
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Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650

Offline Duanob

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Re: CB750 F to K
« Reply #6 on: February 19, 2016, 03:20:40 PM »
It was a pretty nice complete bike to begin with  :)
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"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

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Offline Mantree

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Re: CB750 F to K
« Reply #7 on: February 19, 2016, 11:01:29 PM »
I love the split tail lights in looking online for a set right now to rebuild my tail light as the turn signal is dim on mine

And I personally like pods for how open it makes it

Sent from my ME302KL using Tapatalk
« Last Edit: February 20, 2016, 08:59:25 PM by Mantree »
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Offline martin99

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Re: CB750 F to K
« Reply #8 on: February 20, 2016, 01:58:26 AM »
Thanks for posting, very inspirational and after the sh1t weather we've had, makes me want to get out and do something! Well done for showing the stuff that didn't go right first time too, wouldn't want the newbies to think it's simple ;D
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Build threads:
77 750F2 Refresh Project http://forums.sohc4.net/index.php?topic=144075.0
TRIBSA http://forums.sohc4.net/index.php/topic,160296.0.html

1977 CB750 F2
1958 Norton Model 99
2011 Triumph Street Triple 675

Offline GOONZ

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Re: CB750 F to K
« Reply #9 on: February 28, 2016, 09:07:04 AM »
Got some stuff this past week so time for a update!

Ordered some fancy titanium rotor bolts:


Shoulders are to long


Fixed it with some washers. Not sure if I'm going to keep it this way. The seller couldn't give me an answer if this was safe or not.


Some goodies:




Headlight bracket fabrication:











Left some room for the acewell gauge


Rotors and calipers installed


The only switch I will be running on the handlebars. They are from a company called Motone and are smaller then the Motogadget ones.



I messed up with my previous handlebar clamps. Got some new ones, but I'm not happy with the height. They need to come down a couple of millimeters


For the coming week I'm building a bracket for the rear master cylinder


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Offline Mantree

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Re: CB750 F to K
« Reply #10 on: February 28, 2016, 03:35:12 PM »
Are you not running a horn?

Sent from my SM-G900V using Tapatalk

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Offline GOONZ

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Re: CB750 F to K
« Reply #11 on: February 28, 2016, 03:44:22 PM »
Quote from: Mantree on February 28, 2016, 03:35:12 PM
Are you not running a horn?

Sent from my SM-G900V using Tapatalk

I will be only running the obligated stuff according to the laws of my country.

Lights and a horn. That's it  ;D
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Offline GOONZ

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Re: CB750 F to K
« Reply #12 on: March 27, 2016, 09:03:58 AM »
Got some updates:

Battery box






Seat pan




Kick stand mount


Re-did the oil tank. Ran out of co2 for my welder. Just had enough to tack everything




75€ worth of fittings  ??? ???




Spend some time on the seat. No happy with it , yet.


I also started on a custom loom. Waiting for the speedo to come in so I can finish it.
Not sure what I'm going to to with the exhaust. What you see on the picture is a mock up. I'm not even sure if it's possible this way. I have 0 knowledge of exhausts.

Really close to powder coating and upholstery!
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Offline Stev-o

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Re: CB750 F to K
« Reply #13 on: March 27, 2016, 09:08:07 AM »
Looking good but I would be concerned about the exhaust being so low if you are to ride on the street.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........
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