Author Topic: 70s dragbike barn find rebuild (Read 9635 times)

195suz · « **on:** September 21, 2012, 06:25:16 AM »

Found this in a barn at a friends house, it had a CB750A motor with a drouin supercharger on it. I was finally able to trade some labor on a KZ1000 engine rebuild to get the roller.
Working on gathering parts for it, had another friend donate an F2 motor that I'm using as a mockup.
So far I have a RC mag for it and some 40mm Dellortos on a Lynx manifold, I'm having a hard time with an exhaust system because of the frame any ideas?

Sam Green Racing · « **Reply #1 on:** September 21, 2012, 07:56:21 AM »

I was just looking at the V&H system on mine but I think the down tube on yours would be in the way.

Sam Green Racing · « **Reply #2 on:** September 21, 2012, 08:01:19 AM »

If you get real stuck, you could get one custom made. My friend Juha (lieno on here) had one made for his GS, fantastic job, it allowed him to lower the front end without it fouling the front tyre.

754 · « **Reply #3 on:** September 21, 2012, 08:49:58 AM »

Turbo pipe aint the best but will get you going.. look at the turbo in for sale, it shows the pipe I used..it can be fabbed up.. I think youare going to have to make them..

195suz · « **Reply #4 on:** September 22, 2012, 04:19:24 AM »

Turbo pipe sound interesting, HMF exhaust is local and I know the owner but he's not cheap.I do have the an early CB750 motor with the slip over spicots and separate head pipes, but I think I would be leaving some power on the table.

Greg H · « **Reply #5 on:** September 22, 2012, 06:10:27 AM »

Thats a nice find

. It sure looks like it must have been an "interesting ride " looking at the back half of that frame

. Good luck with the build . Greg "H".

Sam Green Racing · « **Reply #6 on:** September 22, 2012, 08:18:20 AM »

Quote from: 195suz on September 22, 2012, 04:19:24 AM

Turbo pipe sound interesting, HMF exhaust is local and I know the owner but he's not cheap.I do have the an early CB750 motor with the slip over spicots and separate head pipes, but I think I would be leaving some power on the table.

Lewis, the slip over spigots are a straight swap over. You just need to swap the studs for countersunk screws.
Don't go for the OEM philip screws, get the Allen type.

Sam.

MRieck · « **Reply #7 on:** September 22, 2012, 09:11:19 AM »

Quote from: Sam Green Racing on September 22, 2012, 08:18:20 AM

Quote from: 195suz on September 22, 2012, 04:19:24 AM
Turbo pipe sound interesting, HMF exhaust is local and I know the owner but he's not cheap.I do have the an early CB750 motor with the slip over spicots and separate head pipes, but I think I would be leaving some power on the table.

Lewis, the slip over spigots are a straight swap over. You just need to swap the studs for countersunk screws.
Don't go for the OEM philip screws, get the Allen type.

Sam.

Flat head Allens.

195suz · « **Reply #8 on:** September 22, 2012, 01:24:01 PM »

I'll have to go rob them off my other engine I was saving for a cr750 project. That will work for a start.

195suz · « **Reply #9 on:** September 22, 2012, 06:03:45 PM »

Well here's a pic with a stock 72 head pipe on #1 cylinder, broke my #2 bit after removing the first one F&*$K. I think it will keep my feet warm on those cool nights though.

jaguar · « **Reply #10 on:** September 24, 2012, 03:03:48 PM »

What happened to the blower?

195suz · « **Reply #11 on:** September 24, 2012, 05:48:09 PM »

I have it, but as it turns out it was adapted from a Norton.

MoMo · « **Reply #12 on:** September 24, 2012, 05:51:16 PM »

Subscribed, looks like a great vintage project and I really like the color scheme. Plan on keeping or changing? Have fun with it...Larry

SOHC Digger · « **Reply #13 on:** September 24, 2012, 10:38:03 PM »

Glad you started a thread!!! I will definitely be keeping an eye on this one!

jaguar · « **Reply #14 on:** September 25, 2012, 06:22:18 AM »

I really what an old drag bike

195suz · « **Reply #15 on:** September 25, 2012, 04:27:05 PM »

Hey MoMo, I want to repaint it the same as it it. I really like the retro feel of it.

MoMo · « **Reply #16 on:** September 25, 2012, 05:47:30 PM »

Quote from: 195suz on September 25, 2012, 04:27:05 PM

Hey MoMo, I want to repaint it the same as it it. I really like the retro feel of it.

Great! It is a fantastic retro look...Larry

SOHC Digger · « **Reply #17 on:** September 25, 2012, 05:53:31 PM »

What is the front wheel from? Being drum, it wouldn't be a 750.

195suz · « **Reply #18 on:** September 25, 2012, 06:11:43 PM »

hey sohc, the front wheel is a cb77 laced to a wm1 rim on a set of sl125 forks.

windwalker · « **Reply #19 on:** October 02, 2012, 03:30:58 PM »

how about a update lewis

195suz · « **Reply #20 on:** October 10, 2012, 05:40:07 PM »

Has anyone had a chance to read John Steins new book on drag racing it has some great pics.

SOHC Digger · « **Reply #21 on:** October 10, 2012, 06:05:07 PM »

No. Where'd you pick it up at?

195suz · « **Reply #22 on:** October 10, 2012, 06:42:06 PM »

Actually I was at my friends in Wis. this weekend and he had it, it is awesome great section on RC engineering and Vance and Hines it is available at Amazon.

lucky · « **Reply #23 on:** October 11, 2012, 09:07:50 AM »

Quote from: 195suz on September 21, 2012, 06:25:16 AM

Found this in a barn at a friends house, it had a CB750A motor with a drouin supercharger on it. I was finally able to trade some labor on a KZ1000 engine rebuild to get the roller.
Working on gathering parts for it, had another friend donate an F2 motor that I'm using as a mockup.
So far I have a RC mag for it and some 40mm Dellortos on a Lynx manifold, I'm having a hard time with an exhaust system because of the frame any ideas?

I cannot stand that schizophrenic yellow paint!
Geminis would like it. LOL..lol

Put some dignified paint on there.

SOHC Digger · « **Reply #24 on:** October 11, 2012, 10:32:49 AM »

Quote from: lucky on October 11, 2012, 09:07:50 AM

I cannot stand that schizophrenic yellow paint!
Geminis would like it. LOL..lol

Put some dignified paint on there.

That yellow is Awesome! Keep it!!! One thing a drag bike should NEVER be is Dignified!!! Audacious, unapologetic, brazen, but NEVER dignified!!!

195suz · « **Reply #25 on:** October 11, 2012, 07:22:20 PM »

Hey man don't harsh my mellow lol

lucky · « **Reply #26 on:** October 12, 2012, 07:29:46 AM »

Quote from: SOHC Digger on October 11, 2012, 10:32:49 AM

Quote from: lucky on October 11, 2012, 09:07:50 AM
I cannot stand that schizophrenic yellow paint!
Geminis would like it. LOL..lol

Put some dignified paint on there.

That yellow is Awesome! Keep it!!! One thing a drag bike should NEVER be is Dignified!!! Audacious, unapologetic, brazen, but NEVER dignified!!!

OK...ok... "Audacious, unapologetic, brazen, but NEVER yellow!!! Lol..lol

Would you consider red???

SF · « **Reply #27 on:** October 12, 2012, 10:13:22 AM »

kool thread, puuled up a chair for this one.

195suz · « **Reply #28 on:** October 12, 2012, 04:30:45 PM »

The bottom of it is red then it fades into yellow at the top, Come on it's the 70s. lol

lucky · « **Reply #29 on:** October 15, 2012, 12:46:31 PM »

Quote from: 195suz on October 11, 2012, 07:22:20 PM

Hey man don't harsh my mellow lol

Hey man don't tie-dye my fantasy. Lol..lol

195suz · « **Reply #30 on:** October 21, 2012, 12:25:19 PM »

I'm thinking about building a stroker motor using a CB900 crank anybody have any experience with this set up?

windwalker · « **Reply #31 on:** October 21, 2012, 09:30:19 PM »

Lewis, search jweeks and MEC theads in the sohc 4 forums for info on 900 crank fit to sohc750

windwalker · « **Reply #32 on:** October 21, 2012, 09:34:01 PM »

ps Bob Warden has a cb900 motor in back of his shop. its been there for years.

geminimotors · « **Reply #33 on:** October 22, 2012, 07:26:00 PM »

Lucky, Geminis just like to have fun. If you haven't tried this paint yet, you're missing out.

195suz · « **Reply #34 on:** October 27, 2012, 12:28:37 PM »

Well It looks like what I'm going to use is a cb750 cases, cb900f, crank and rods I have not made up my mind on the top end maybe some cb350 pistons or just a 836 kit.

SOHC Digger · « **Reply #35 on:** July 19, 2015, 05:53:09 PM »

Whatever happened to this build thread?!?!

Don R · « **Reply #36 on:** July 19, 2015, 07:29:33 PM »

He posted he's looking for 73mm pistone in the drag bike thread in the hi perf section.

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Author Topic: 70s dragbike barn find rebuild (Read 9635 times)