Author Topic: 1978 CB750 F2 "Get it on the road"  (Read 1380 times)

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Offline supergates

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1978 CB750 F2 "Get it on the road"
« on: October 11, 2015, 02:09:39 AM »
Hello all.

I thought I'd take a few minutes to share with you my build.

It's been a dream of mine for a few years to build a cafe racer, despite not having my motorbike license. Last year I finally took the plunge, did my test, and 2 weeks later I picked up a '78 F2. The bike was in fairly good shape, but the price was very good also, Im sure some people would probably rather have seen her restored to standard (including the guy that I bought her from).

I work in motorsport, which means I don't really have a huge amount of spare time to actually build or pencil ideas down, so a lot of my inspiration came from builds on this forum (namely Tweakin, and a build I saw on YouTube).

My plan was to build a 'year 1' bike, with some tried and tested ideas borrowed from other builders, and then take some time to ride her. After that, once I have a good feeling for the bike, and have had more time to think about how I would like the bike to evolve, then I will begin to make changes.
The seat was a pre made item, by Bedlam Werks. I bought it to save me the time of making one now, plus with a pre upholstered seat pad, it's a pretty easy solution for starters. But already I think it's too long, and slightly too tall, so 'year 2' will see me making something of my own.

I decided to directly take the plunge and convert her to a GL1000 front end, mainly because I felt that spoked wheels was what I would always want on the bike. Sourcing an F1 rear hub for this was difficult, but eventually I found one through this forum.

The engine hasn't had any work, just a few coats of Wrinkle Finish paint to try and tidy it up a little. The plan will be to eventually fit an 836 kit, and overhaul the gearbox etc at the same time.

And eventually I will come up with a more striking colour scheme for her. I went with black for now, just so that it looks clean.

Thanks for looking, any suggestions will be gratefully received!

Stuart.


« Last Edit: October 12, 2015, 02:54:21 PM by supergates »

JWExperience

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Re: 1978 CB750 F2 "Get it on the road"
« Reply #1 on: October 11, 2015, 02:26:26 AM »
I think you did a nice job! I love those seats, can I be first inline when you remove it?!?!


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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750 F2 "Get it on the road"
« Reply #2 on: October 11, 2015, 06:25:14 AM »
Yes, your bike has some familiar design elements.  Great job on the bike, Stuart.

My bike was an odyssey build of two steps forward, one step back.  I'm hoping that yours went smoother.  How long did it take from start to finish?
« Last Edit: October 11, 2015, 07:10:02 AM by CB750 Cafe Racer Fan »
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

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Offline supergates

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Re: 1978 CB750 F2 "Get it on the road"
« Reply #3 on: October 12, 2015, 09:35:56 AM »
Start to finish was exactly 12 months. But with some pretty big periods of not doing anything to her (I moved to Belgium during the build).

It's been a good learning experience, I'd never touched a carb before this, so to rebuild 4 straight off was a big job, but now it's good fun to play around with jetting etc.

It's still not without issues, wet running being one. I know I won't ride much in the wet with her, but when I have it's developed big issues on 3rd and 4th cylinder, I presume water and coil related. So my next job is to work on that. I'm going to dive straight in and throw a set of Dyna coils on her, with some new ignition leads, and look at waterproofing all of the wiring. I don't want to get caught out in the rain and stranded somewhere.

Offline martin99

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Re: 1978 CB750 F2 "Get it on the road"
« Reply #4 on: October 12, 2015, 03:28:54 PM »
It's still not without issues, wet running being one. I know I won't ride much in the wet with her, but when I have it's developed big issues on 3rd and 4th cylinder, I presume water and coil related. So my next job is to work on that. I'm going to dive straight in and throw a set of Dyna coils on her, with some new ignition leads, and look at waterproofing all of the wiring. I don't want to get caught out in the rain and stranded somewhere.

Sorry, not with you on this one. You have one coil that serves cylinders 1 & 4, and another that serves 2 & 3. If you've got problems on cyls 3 & 4 it's unlikely to be coil related. If you want to splash out on new coils that's up to you of course, but don't be surprised if the problem still remains. Stock coils seldom go wrong. IIWY i would snip back a quarter inch off the ignition leads so the caps have a good connection, test the caps themselves and replace as necessary, and throw in a new set of plugs. Then see what you got.
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 koendd

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Re: 1978 CB750 F2 "Get it on the road"
« Reply #5 on: October 14, 2015, 10:33:11 AM »
Nice bike!

Ik heb ook een F2 :) van waar ben je ergens?
1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline calj737

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Re: 1978 CB750 F2 "Get it on the road"
« Reply #6 on: October 14, 2015, 12:39:33 PM »
I know I won't ride much in the wet with her, but when I have it's developed big issues on 3rd and 4th cylinder, I presume water and coil related.
Also, double-check the gasket under the points cover  :) And you can add some insulation/weather shielding around the connections to the coils (stock bullets).

Of course, the open filter doesn't help at all...
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

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