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Author Topic: cb 750 f2 brat - top end rebuild in progress..  (Read 18365 times)

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Offline koendd

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #25 on: May 01, 2014, 09:01:45 AM »
Hey Raymond, to late indeed but had it figured out already...
All will make a habit of it to always hold the clutch lever when firing... or to always put in neutral when killing it...

Which reminds me of my bike exam... Had to drive somewhere. Pull over and move it backwards just to show that you can handle the dead weight of the bike, but I forgot to put it in neutral before I killed it. Boy was I stressed... couldn't find the neutral :D
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1976 cb360
1984 GPZ900R

Offline Statenheimer

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #26 on: May 01, 2014, 11:27:47 AM »
Looks like a good project base, nice work so far.

I have to say, I love the Opel  8)
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Offline koendd

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #27 on: May 06, 2014, 12:27:04 PM »
thx statenheimer!
the kadett was my first car, bought it when i was 18, worked on it for 4 years...

tackled the carbs today

since exhaust on the nr1 cylinder wasn't heating suspected the carbs so had to take them apart.

went fearly easy concidering it was the first time I did that.

Found that the needle on carb 1 was stuck. Took it apart and the spring was bend and twisted, since I didn't have another one got it straight as much as possible and that seemed to work.
Also there was a piece of dirt on the main jet, so replaced that one.

Other then that no major issues, just cleaned all the carbs, changed all the O-rings, gaskets and idle jets.

soaked the bodies in hot water with some degreaser and cleaned with a small brush.





Not esthetically perfect but they are clean in and outside so I'm happy.


I'll bench synch them tomorrow and that should be it for the carbs I hope...
« Last Edit: May 06, 2014, 12:29:55 PM by koendd »
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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline koendd

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #28 on: May 11, 2014, 11:36:14 AM »
bench sync went ferfect, not that difficult at all...
Just found out you have to be really carefull not to destroy the tread in the carbs...

bought myself a little present, cognito moto top tree. But will paint it black I think...


next will be the engine removal this week, so I can paint it and renew the seals/bolts

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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline koendd

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #29 on: May 22, 2014, 01:14:48 PM »
removed the engine from te frame




the engine has been taking apart before (blue sealent here and there) and miscellaneous bolts and nuts have been used...









I think i'm missing this sprocket cover?


blasted the frame today


primed it in black, if there is damage it will be less noticable






had some 2 pack leftovers, one can was matte, one can was high gloss, comined the two so it would be satin but guess there was a bit to much gloss paint... not that big of an issue ...



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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline koendd

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #30 on: June 17, 2014, 01:09:50 PM »
painted the engine en started to renew the gaskets since it was leaking oil in a few places



then I found this...



Wheels have been send of to powder satin black,
Did the hubs myself with new all balls bearing and seal


pressed in the new cups for tapered bearing


and sourced to F1 calipers for the spoked wheels



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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline koendd

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #31 on: June 17, 2014, 01:13:06 PM »
got a friend of mine to make "my" own version of the gordon frame kit since they are nowhere to buy in Belgium/Europe







After I was sure the middle section could be removed, welded it and cleaned it all up






all i have to do now is drill two holes in the triangle so I can bolt a plate to the back of it
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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline edwardmorris

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Re: cb 750 f2 brat build - Belgium she's a runner!
« Reply #32 on: June 17, 2014, 01:55:26 PM »
Quote from: koendd on June 17, 2014, 01:13:06 PM
got a friend of mine to make "my" own version of the gordon frame kit since they are nowhere to buy in Belgium/Europe
Your kit looks great. Just FYI, you could have also checked with Gordon, he ships internationally.
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Offline SOHC4 Cafe Racer Fan

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Re: cb 750 f2 brat build - Belgium: welded in a frame kit!
« Reply #33 on: June 17, 2014, 02:01:36 PM »
You'll be happy (later) that you put that frame kit in -- although not a happy as if you would have been installing it before painting the frame. 
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2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
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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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2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline koendd

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Re: cb 750 f2 brat build - Belgium: welded in a frame kit!
« Reply #34 on: June 17, 2014, 02:34:13 PM »
Quote from: CB750 Cafe Racer Fan on June 17, 2014, 02:01:36 PM
You'll be happy (later) that you put that frame kit in -- although not a happy as if you would have been installing it before painting the frame.

hahaha, true story...  ;D ;D
Found it out a bit late about it being  that handy so I had to change it now or never :D

Quote from: edwardmorris on June 17, 2014, 01:55:26 PM
Quote from: koendd on June 17, 2014, 01:13:06 PM
got a friend of mine to make "my" own version of the gordon frame kit since they are nowhere to buy in Belgium/Europe
Your kit looks great. Just FYI, you could have also checked with Gordon, he ships internationally.

thx, I know but with shipping, import taxes being absurdly high in belgium (30%) it wasn't really cheap in the end...

« Last Edit: June 17, 2014, 11:33:17 PM by koendd »
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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline SOHC4 Cafe Racer Fan

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Re: cb 750 f2 brat build - Belgium: welded in a frame kit!
« Reply #35 on: June 17, 2014, 05:40:49 PM »
Quote from: koendd on June 17, 2014, 02:34:13 PM
Quote from: CB750 Cafe Racer Fan on June 17, 2014, 02:01:36 PM
You'll be happy (later) that you put that frame kit in -- although not a happy as if you would have been installing it before painting the frame.

hahaha, true story...  ;D ;D
Found it out a bit late about it bit that handy so I had to change it now or never :D

Quote from: edwardmorris on June 17, 2014, 01:55:26 PM
Quote from: koendd on June 17, 2014, 01:13:06 PM
got a friend of mine to make "my" own version of the gordon frame kit since they are nowhere to buy in Belgium/Europe
Your kit looks great. Just FYI, you could have also checked with Gordon, he ships internationally.

thx, I know but with shipping, import taxes being absurdly high in belgium (30%) it wasn't really cheap in the end...

I found out the hard way later.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"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)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline koendd

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Re: cb 750 f2 brat build - Belgium: welded in a frame kit!
« Reply #36 on: June 20, 2014, 07:06:41 AM »
touched up the paint on the frame...





made the connection with the triangles and two strips of metal



back to the engine, fixed the clutch


in the proces of getting the old and cracked lifter plate of I broke a bolt. Drilled it out and tapped new tread, clearly I did something wrong because the backplate which holds the bolts just cracked when I mounted the new lifter plate.... So had to install a new back plate as well...


all back together with new lifter plate


new seals and some polishing


testfitted the F1 calipers together with the F2 lower tripple and F2 stainless hoses. Perfect!




so painted that as well

so now the engine could go back in the frame, what a difference with those tubes out of the way...


some random pieces...

machined the rear rotor and repainted the center

some brake parts




found the missing sprocket cover which my bike didn't have when I bought it so repainted it together with the exhaust clamps.

« Last Edit: June 20, 2014, 07:09:39 AM by koendd »
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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline koendd

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Re: cb 750 f2 brat build - Belgium: welded in a frame kit!
« Reply #37 on: August 03, 2014, 12:37:54 PM »
started with building the bike up again

dual disks on F1 fork





F1 rear end + master cylinder


new dampers, chain and sprockets


got the wheels back from powder


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1972 cb750K2 brat
1976 cb360
1984 GPZ900R

Offline koendd

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Re: cb 750 f2 brat build - Belgium: welded in a frame kit!
« Reply #38 on: August 03, 2014, 12:42:06 PM »
cognito moto triple with mini gauges


then had my summer holiday and build the rest of the bike




the pods will have to go for now, will stick with the airbox if I get it in place that is...

also another question.
I have an F2 but with some F1 bits like brakes, rear and front end.
I have a 630 chain, 14/41 sprockets.

I installed them on the bike with no problems but the chain tensioner is almost at the end and it's not really tight at all (more then the manual says.)

Is this because the chain is too long? Can't be worn since it's new...
I do have a 43 sprocket would that help?

thx ;)
« Last Edit: August 03, 2014, 01:07:29 PM by koendd »
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1972 cb750K2 brat
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1984 GPZ900R

Offline quebec_monstro

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Re: cb 750 f2 brat F1 vs F2 question: 630 Chain??
« Reply #39 on: August 08, 2014, 09:23:47 AM »
Wow your built is really impressive... :D I'll try to do something as good as yours with mine  8)
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Offline Ravie

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Re: cb 750 f2 brat F1 vs F2 question: 630 Chain??
« Reply #40 on: August 08, 2014, 12:34:26 PM »
Very Nice!  Those Dual Discs front and rear should stop that thing in a hurry!
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Offline koendd

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Re: cb 750 f2 brat F1 vs F2 question: 630 Chain??
« Reply #41 on: August 16, 2014, 06:08:39 AM »
thx!

well, the front brakes worked fine, but couldn't get the rear one to work...
Bled it like 10 times but air would keep coming up in the master cylinder.

Got fed up with it and took it apart again to find out I turned the spring up side down which caused the seal to be stuck on the side of it...

mounted it correct and 2 minutes later I had a working rear brake!

Also put the 43 sprocket on the bike and chain issue is solved (was rather logic but this is all new to me...)

and also put the stock airbox in place and what a difference, now I have the full power of the bike. Won't be using the pods anymore!
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Offline koendd

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Re: cb 750 f2 brat F1 vs F2 question: 630 Chain??
« Reply #42 on: August 29, 2014, 09:38:54 AM »


finally got my (real) license plate so the first legal miles have been driven today :)

I was actually sanding the tank down because I had no license plate, and the day after it arrived...
So worked a bit extra yesterday, sprayed it with filler, sanded it down and primed it last night.

Next step will be the color (green from the headlight) with a satin gloss clear coat and black honda letters.

Also mounted a rear light after the seat, didn't like the side mounting that much... Way better now me thinks :p





also made a side panel for the electrics cover since the original one doesn't follow the lines of the frame which is a shame...




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1984 GPZ900R

Offline Davidov

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Re: cb 750 f2 brat on the road :)
« Reply #43 on: August 29, 2014, 12:32:59 PM »
It's looking better each time, I like it!
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Offline Trad

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Re: cb 750 f2 brat on the road :)
« Reply #44 on: August 29, 2014, 04:15:57 PM »
Nice work! I really like the direction you took that thing. The green will look great against the brown seat.
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Offline koendd

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Re: cb 750 f2 brat on the road :)
« Reply #45 on: September 04, 2014, 12:51:16 PM »
thx guys!

sanded the primer down yesterday after work and went to a friend who owns a body shop, he let me use his paint boot and this is the result :)

















only thing left to now is some maintenance for this winter, renew the O-rings in the head cause the head is leaking in the middle were the header is and overhaul the forks with new springs and oil...
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Offline SOHC4 Cafe Racer Fan

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Re: cb 750 f2 brat on the road :)
« Reply #46 on: September 04, 2014, 03:43:16 PM »
Quote from: koendd on March 11, 2014, 07:12:43 AM
I'm Koen, 25 and been dreaming about bikes, well, ever since I could sleep I guess...

Then finally after lots of persuasion (of the girl...) I bought a project last week!


My favorite two things from this build string -- the comment and the picture.  A girl who persuades you to buy a motorcycle? Hold on to that one -- she's a keeper!
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"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)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SOHC4 Cafe Racer Fan

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Re: cb 750 f2 brat on the road :)
« Reply #47 on: September 04, 2014, 03:57:08 PM »
I give Koen a lot of credit.  Lots of nice work (fork swap, wheels, paint, engine). 

Nominated for BOTM.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"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)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Retro Rocket

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Re: cb 750 f2 brat on the road :)
« Reply #48 on: September 04, 2014, 04:17:37 PM »
My ass hurts just looking at that seat... :o  The color of the tank matches the seat color well... ;)
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Offline brandEn

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Re: cb 750 f2 brat on the road :)
« Reply #49 on: September 04, 2014, 05:20:40 PM »
I like this bike. The color combo with the seat is awesome.
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