Author Topic: Custom oil tank for CB 750  (Read 8261 times)

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Offline anotherCB

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Custom oil tank for CB 750
« on: October 06, 2011, 11:39:53 AM »
I have been pondering the idea of getting a custom oil tank for my CB 750 and opening up that triangle. I plan on getting a custom made flat tank that hides between the frame where the inner fender sits. I found someone on ebay who makes me one for a reasonable price. Now I was wondering, do I need those big size original oil lines or can I go with a smaller diameter? Anything else I should be watching out for?

Also, what is a good small battery that I can lay down in my seat hump and what is the min cranking amerage I need?

Thanks a lot! Olaf
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #1 on: October 06, 2011, 06:31:10 PM »
No I think it's another guy. What about the size of the tank? Should I make it as big as the original or can it be smaller? Any experience with that?
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline 754

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Re: Custom oil tank for CB 750
« Reply #2 on: October 07, 2011, 10:22:04 AM »
 MOST lines are smaller OD for correct size than the stock Honda ones.
 If you are thinking of reducing capacity, think about how hot the temps will be that you ride in and if you will be getting stuck in traffic a lot.
 If I am riding across a desert in high temps I like to throw in an extra quart, which you can do with the stock bucket.. idling in traffic can get a bike VERY hot...
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way
69 z50
OHV 200..(Trail 90)

Offline yellowbirdrs

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Re: Custom oil tank for CB 750
« Reply #3 on: October 07, 2011, 01:22:15 PM »
I did mine to match the OEM capacity just hide it under the custom gas tank also keep the OEM OD hoses



a pressure old test video and you can see where it's located and the shape
<iframe width="420" height="315" src="http://www.youtube.com/embed/qYtYwXR5eAE" frameborder="0" allowfullscreen></iframe>
X/A
Summer 2011

Offline splitt

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Re: Custom oil tank for CB 750
« Reply #4 on: October 07, 2011, 08:05:10 PM »
There have been many dry sump bikes that have been built using smaller oil tanks than stock one. An oil cooler will definitely help with the heat issues. You will need to change the oil sooner also.

Offline scottly

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Re: Custom oil tank for CB 750
« Reply #5 on: October 07, 2011, 09:29:10 PM »
I personally would not use any line with a smaller ID than stock, especially on the supply line to the oil pump. 5/16" ID line is asking for disaster, IMHO.
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline Retro Rocket

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Re: Custom oil tank for CB 750
« Reply #6 on: October 07, 2011, 10:28:16 PM »
I personally would not use any line with a smaller ID than stock, especially on the supply line to the oil pump. 5/16" ID line is asking for disaster, IMHO.

+1, so is running less oil, it will heat up faster stay hotter and need changing more regularly, loose a little and you will be in big trouble...
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #7 on: October 08, 2011, 02:42:35 PM »
First of all thanks guys. I definitely do not want to run an oil cooler since I want to stay as minimalistic as possible. I ride a lot in the heat, CenTex was in the 100s most of this year, so from all I hear I think I might be staying on the safe side and won't go as small as possible, neither with the tank size nor with the line diameters.

One other question I had, what is a good, cheap battery to hide in the seat hump and what is the cranking amperage I need for a stock K7? Also, isn't there an after market rectifier out there that is much smaller?

Thanks again, Olaf
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline wannabridin

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    • 1976 CB750K, under construction:
Custom oil tank for CB 750
« Reply #8 on: October 08, 2011, 02:45:58 PM »
Check our my build thread, my oil tank will double as a bit of an oil cooler.  100% hand made from Al, so thermal exchange should  be decent too.  I haven't mounted it yet, but with TT's "anti-pod" intake, I should have a very nice open triangle!! :)
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline wannabridin

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    • 1976 CB750K, under construction:
Custom oil tank for CB 750
« Reply #9 on: October 08, 2011, 02:46:39 PM »
Oh ya, im in NE TX, just south of DFW airport, where are you??
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline 754

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Re: Custom oil tank for CB 750
« Reply #10 on: October 08, 2011, 08:14:19 PM »
 How many K on the choppers.. Under marginal conditions, going 5 or 8 K is bugger all.. I meam many of us have put 30 K or more on CB 750 motors or bottom ends.. some over 100 K
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way
69 z50
OHV 200..(Trail 90)

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #11 on: October 10, 2011, 06:49:41 AM »
Wannabridin, that's an amazing oil tank! Would you mind me askin who made it and what you paid for it? I am starting the process of getting a tank done that is going to sit where the fender is, but now after seeing yours......oh and I am located in Austin.
Thanks guys.
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline wannabridin

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    • 1976 CB750K, under construction:
Re: Custom oil tank for CB 750
« Reply #12 on: October 10, 2011, 03:19:03 PM »
Wannabridin, that's an amazing oil tank! Would you mind me askin who made it and what you paid for it? I am starting the process of getting a tank done that is going to sit where the fender is, but now after seeing yours......oh and I am located in Austin.
Thanks guys.

little_horse from here made it.  his name is Andrew and it's in Beaverton, OR.  HELLUVA guy, had the chance to meet him a couple nights ago up there and go to dinner.  he is quite an awesome fabricator!  i won't divulge the price i paid for it, as him and i worked on some deals since i gave him a good amount of work (fully custom cowl, oil tank, gas tank work, a custom exhaust tip and bushings for my truck) over the past few months.

i ordered the bungs and filler from BungKing.com and shipped them to him.  he fabbed up the tank to my dimensions, which i had another member on here, Brenden throw together in solidworks for me.  here's what he did.  i certainly love these forums, the people on here rock!!



i think the cooling fins will work well, and the tank should hold about the same amount of oil as the stock tank, maybe just a tad less.  shoot Andrew a PM, he would love the business!  here's his build thread: http://forums.sohc4.net/index.php?topic=64250.0
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #13 on: October 10, 2011, 04:10:43 PM »
Thanks man! So you wouldn't mind if I "steal" this from you and copy it? Would you by chance have a pic with the tank on the bike? I agree, this forum rocks!
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline wannabridin

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  • -Garrett
    • 1976 CB750K, under construction:
Re: Custom oil tank for CB 750
« Reply #14 on: October 11, 2011, 05:01:28 PM »
i don't mind you borrow it, just as long as you give credit where it's due.  me for the design but mainly andrew for the work and brenden for the cad skills. 

but the main thing, don't just copy mine.  make it your own, come up with some of your own ideas.  andrew loves a challenge, so give him something that's cooler and better than mine!  no sense just copying something that's already out there.  take it to the next level on your own.  ii even considered vertical fins on the rear, so start thinking of stuff to customize your own bike.
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline DORIGTT

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Re: Custom oil tank for CB 750
« Reply #15 on: October 11, 2011, 06:02:51 PM »
Hey Wannaberidin,
Can I get the guy in Beaverton's contact info?  I live 25 minutes from there and would love to get in contact with him to get a tank made for myself.

Offline wannabridin

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  • -Garrett
    • 1976 CB750K, under construction:
Re: Custom oil tank for CB 750
« Reply #16 on: October 11, 2011, 09:31:30 PM »
sure.  i'll PM you his address.  tell him Garrett sent you!

anothercb, check out my build thread.  i put some close up and semi-mounted pictures of the tank in the frame.  lemme know if you have anymore questions.
1976 CB750K, currently under construction:
http://forums.sohc4.net/index.php?topic=64468.0

-And if you don't do it this year, you'll be one year older when you do...

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #17 on: October 12, 2011, 05:45:55 AM »
Thanks Wannabridin!
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline greddm

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    • CB750 Cafe Build
Re: Custom oil tank for CB 750
« Reply #18 on: November 21, 2011, 01:05:43 PM »
Does anyone have a picture of the tank installed?  I would love to see what it looks like.

Offline Really?

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Re: Custom oil tank for CB 750
« Reply #19 on: November 21, 2011, 01:20:18 PM »

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #20 on: April 16, 2012, 07:15:33 PM »
Just wanted to warm up this old thread and post a pic of my final product. Thanks for all your input! You got me motivated! Will post more pics soon and I am also writing up a build thread.
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline Retro Rocket

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Re: Custom oil tank for CB 750
« Reply #21 on: April 16, 2012, 10:37:42 PM »
Just wanted to warm up this old thread and post a pic of my final product. Thanks for all your input! You got me motivated! Will post more pics soon and I am also writing up a build thread.

Any feedback on the yoshi rep pipe mate..?  Thats one of Chris's isn't it.?

Mick
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Blitzburgh207

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Re: Custom oil tank for CB 750
« Reply #22 on: April 17, 2012, 05:05:02 AM »
Wow that looks great! Excellent work!
1978 CB750 K8

Offline anotherCB

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Re: Custom oil tank for CB 750
« Reply #23 on: April 17, 2012, 06:00:50 AM »
Wow, good eye RetroRocket. Yes it is a stainless steel from motogpworks and I was told someline named "Chris" makes them. Excellent product!

Thanks Blitzburgh, I will post a detailed thread soon, there are some more photos here if you are interested
http://forums.sohc4.net/index.php?topic=105433.msg1179000#msg1179000
Have:
1977 CB 750K
1996 HD FatBoy
Had:
1972 Honda CB 250
1974 Yamaha RD 350
198? Honda XL 500
1978 Kawasaki KZ 650
198? Suzuki DR 750
198? Yamaha XT 750 Super Tenere
2000 Honda CR 250
2005 BMW K1200S

Offline Retro Rocket

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  • ROCK & ROLL
Re: Custom oil tank for CB 750
« Reply #24 on: April 17, 2012, 03:15:16 PM »
Wow, good eye RetroRocket. Yes it is a stainless steel from motogpworks and I was told someline named "Chris" makes them. Excellent product!

Thanks Blitzburgh, I will post a detailed thread soon, there are some more photos here if you are interested
http://forums.sohc4.net/index.php?topic=105433.msg1179000#msg1179000

I have the same pipe.... ;D  Just curious as to how loud it is and ease of fitting.....
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

 

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