Author Topic: Honda CB750 F2 1978 Manx Style caferacer - Running (update 20/09/2011)  (Read 26531 times)

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Offline dakota

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Hi all,
I am new to this website and new to Honda. I am a britbiker and have already restored a couple of BSA's. I always wanted to build a caferacer, but it was very difficult to find a britbike to turn into a caferacer, the prices of these bikes are here very high. So I decided to go for a Honda CB750. After a couple of months searching I found a very good deal: a complete F2 from 1978, a complete spare engine, 6 extra carbs, 4 extra wheels... for the price of 600$. The target is to build a Honda CB750 Manxstyle caferacer.

I have completely stripped the engine cleaned all the muck off it and assessed what is worn out and what can be reused. For an F2 the problem usually seems to be the valves, cam, and rockers, fortunately mine are reusable, (also the parts of the spare engine are reusable)  and the bottom end of the engine is really good. The cilinders are a bit rusty, and the rings worn.
The progress so far is:
-engine degreased, blasted
-replaced all seals, orings
-balanced the crank
-new shells for crankcase
-after a chat with Voxonda all concenring camchain and primary chain is replaced
-new front sprocket
-new manx gastank from TABaker
-new wideline manx seat from WBO-racing
-new bearings for the wheels
-comstars are already painted and are now waiting for new Bridgestones
-taper roller bearings for steering
-new piston & seal kit for rearbrake
-double piston front brakes from a honda cb750 1980 rc04
-velocity stacks from Steel Dragon
-I have ordered the famous framekit and a 'dresda' swingarm from Voxonda
-replaced the complete transmission with these from the spare engine

The lower engine is now ready, the top is now going away for a complete checkup: valves, guides, pistons... Also the cilinder+head of the spare engine is going away for a checkup. Than we can decide what parts are still reuasble or if I have to go for a re-bore.

Will be continued...


















Spare engine

























« Last Edit: September 20, 2011, 06:45:57 AM by dakota »

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #1 on: April 20, 2010, 04:19:58 AM »
Rebuild of the speedo and tacho







New rearset



Manx seat and tank






Blasted crankcase and other parts









Crankcase with spare transmission













Offline andy750

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #2 on: April 20, 2010, 04:59:10 AM »
Beautiful work! Im looking forward to seeing the finished product - the tank looks great! 

Good luck
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

traveler

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #3 on: April 20, 2010, 05:15:26 AM »
The first few pics had me depressed.....Alot of scrubbing, blasting and sanding....then the pics started looking better, then GREAT! :D

Please keep us posted.....looks good!

~Joe

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #4 on: April 20, 2010, 08:36:51 AM »
Cleaned revised carb with velocity stacks


How the carb was...

And now...




« Last Edit: April 20, 2010, 08:38:28 AM by dakota »

Offline dagersh

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #5 on: April 20, 2010, 10:09:17 AM »
Beautiful work!!!
1962 CA95
1966 Black Bomber
1966 CA77 Dream
1967 Superhawk
1970 CB750K0
1972 CL350
1972 CB450/500 Custom
1972 CB500K1
1975 CB550F
1976 CB400F
1975 CB750 Future Restoration
1976 CB750K6
1976 CB750F
1976 GL1000


1968 Suzuki T500 Cobra
1990 BMW K1
2001 'Busa
2003 RC 51
Bunch of Guzzi's

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Offline SKTP

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #6 on: April 20, 2010, 12:30:28 PM »
Really nice...I hope I can do something close to that?!!!

1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline GStarIndustries

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #7 on: April 20, 2010, 03:17:26 PM »
Dude!!! what rear sets are those!!!

traveler

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #8 on: April 20, 2010, 09:51:50 PM »
You are definitely heading in the right direction.

These Honda's are more rewarding than the British stuff you are used to.....parts are much cheaper, and we also have a fanatical cult following.

I hope this build convinces you to stick around here isntead of only at any of the Triton/Norvin sites where Lucas electrics is praised! ::)

~joe

Offline UK Pete

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #9 on: April 20, 2010, 11:22:44 PM »
Good work there Dakota, i love the F2 model and after restoring my first F2 i plan to cafe racer my second one,
I will be watching your posts as you seem to be turning out some real quality work, and i hope to get some ideas from yours, well done
Pete

Offline Holdingfast

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #10 on: April 21, 2010, 12:23:45 AM »
ghetto subscription  ;D

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #11 on: April 21, 2010, 01:09:20 AM »
Dude!!! what rear sets are those!!!

Hi,
this rearset is from Metisse, https://www.metisse.de/
dakota

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #12 on: April 21, 2010, 01:12:23 AM »
You are definitely heading in the right direction.

These Honda's are more rewarding than the British stuff you are used to.....parts are much cheaper, and we also have a fanatical cult following.

I hope this build convinces you to stick around here isntead of only at any of the Triton/Norvin sites where Lucas electrics is praised! ::)

~joe

Hi Joe,
...Lucas, the prince of darkness...
but I've noticed that prices for spareparts for the Honda or BSA are in the same range, but you're right it's a fantical cult!
dakota

Offline Mossy21

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #13 on: April 21, 2010, 03:59:23 AM »
Great work.....  Keep the build pics coming !   8)
If I can't see the Engine I can't see the point.......

Offline Brown Bomber

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #14 on: April 21, 2010, 04:08:04 AM »
Two thumbs up! Can't wait to see the bike when you done.
Keep the Shiny side up!

1987 ZG1000 "King Crimson"
1972 CB750K2 "Stout"
1976 CB500T "Witch's Promise"
1973 CL450K5 Cafe Project
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Offline Freaky1

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #15 on: April 21, 2010, 05:31:51 AM »
Very nice work!! I like the Manx tank, looks like it still has the signature "F" length but narrower end. I'll be checking back often, again nice job!
That which does not kill you leaves cool scabs which turn into awesome scars.

'77 CB750F Come on...were almost there!

Offline grumpy

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #16 on: April 21, 2010, 07:30:34 AM »
I must have one of those tanks.
I shall have one of those tanks!

Offline GStarIndustries

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #17 on: April 21, 2010, 08:40:37 AM »
Dude!!! what rear sets are those!!!

Hi,
this rearset is from Metisse, https://www.metisse.de/
dakota

Are these bike specific or do you have to modify to fit?

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #18 on: April 21, 2010, 08:55:50 AM »
Dude!!! what rear sets are those!!!

Hi,
this rearset is from Metisse, https://www.metisse.de/
dakota

Are these bike specific or do you have to modify to fit?

Yip, I have to make some modifications to the frame.

Offline Gonzowerke

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #19 on: April 21, 2010, 10:21:58 AM »



[/quote]

Yip, I have to make some modifications to the frame.

[/quote]

What make and model bike did you select when you bought the rearsets?
1977 F2 "Highway Star"
1977 F2 "Bike-In-A-Box"
1978 K8 "Frankenbike"
1991 CRX Si "Buzz Bomb"
2000 Jeep Wrangler "UBoat"
2011 BMW S1000RR "TIE Fighter"

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #20 on: April 21, 2010, 11:10:00 AM »
It's from a Kawasaki ZX9R

Offline eurban

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #21 on: April 21, 2010, 05:47:29 PM »
Can you please share a bit more about the tank and the dealings with TABaker?  What was the cost?  Is the tank a direct fit on the 78F frame using stock mounting points/hardware? Petcock? Pics of the underside? Aprox fuel capacity? Thanks a bunch!

Offline Henrik Vik

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #22 on: April 22, 2010, 10:19:29 AM »
Excellent build! I am looking into a Manx seat as well, for my CB750 F1. How does it fit the frame? Just right? I thought I needed the slimline version, but obviously the wideline is the way to go. Can you confirm?
CB750 K2 - Pretty stock...
CB750 F1 - Henry Abe 900 Kit

Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #23 on: April 28, 2010, 11:06:31 AM »
Can you please share a bit more about the tank and the dealings with TABaker?  What was the cost?  Is the tank a direct fit on the 78F frame using stock mounting points/hardware? Petcock? Pics of the underside? Aprox fuel capacity? Thanks a bunch!
Hi,
I had to wait 7 weeks before I had the tank, about 550$, The tank has the same front mountings points as the standard tank, at the rear there is knob for a small strap.




Offline dakota

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Re: Honda CB750 F2 1978 Manx Style caferacer
« Reply #24 on: April 28, 2010, 11:08:12 AM »
Excellent build! I am looking into a Manx seat as well, for my CB750 F1. How does it fit the frame? Just right? I thought I needed the slimline version, but obviously the wideline is the way to go. Can you confirm?
You're right, it is the slimline version. It doesnt fit, I've to make a frame
g