Author Topic: 1975 CB750F - Project Yellow Jacket (Read 57808 times)

HavocTurbo · « **Reply #125 on:** May 30, 2009, 09:43:44 am »

Quote from: DollarBill on May 30, 2009, 08:42:24 am

So I have 07 GSXR front brakes and am wondering if my CB750 master cylinder will work with them? The resevoir looks similar in size but what else plays into it? I don't know squat about this subject...

I wouldn't. Despite the outer size arent the GSXR calipers 3 or 4 pots on each side? Making them 6 or 8 total?

They are waaaaaaay too much for our poor stock MC.

DollarBill · « **Reply #126 on:** July 16, 2009, 11:07:46 am »

Buying parts....

R1 Shift linkage to go with my rearsets
07 GSXR Upper Triple clamp to go with my forks
Stator cover to replace dented one
600rr tail section
Swatt Moto Clipons like the ones in this pic - 3.5" rise

I have been tinkering with ideas for the seat. This fits better than I thought as far as the seat meeting up to the tank. The side trim that meets the tank sits almost perfectly on the frame rails. Will have to put together a little bit of a subframe for the inside and put some tabs on the frame to screw the front to but shouldn't be too hard.

Ecosse · « **Reply #127 on:** July 16, 2009, 11:21:53 am »

god that swingarm is serious business! that poor frame doesn't stand a chance against the newer bits.

tail actually looks good. reminds me of the dirt tracker tails.

DollarBill · « **Reply #128 on:** July 16, 2009, 11:51:46 am »

Quote from: Ecosse on July 16, 2009, 11:21:53 am

god that swingarm is serious business! that poor frame doesn't stand a chance against the newer bits.

Ah-ha! And that is why I chose this swingarm. The excerpt below was taken from Honda's documentation on the new 600rr design.

Quote

"Integrated into the CBR’s rigid but lightweight swingarm is essentially the
same Unit Pro-Link rear suspension system pioneered on the race-winning
RC211V MotoGP racer. Its highly advanced design completely isolates the
frame from the shocks and stresses generated by conventional rear suspension
systems, especially under aggressive riding and racing conditions. This system
also eliminates the need for extra frame reinforcement to counter those stresses,
thus allowing the frame to be designed lighter than other more conventional
designs, while freeing up space to permit the lower, mid-chassis positioning of
the fuel tank, thus making another large contribution to mass centralisation and
superior riding control."

Given that I will still do some strengthening of the frame.

Retro Rocket · « **Reply #129 on:** July 16, 2009, 06:04:34 pm »

Hi Dollar bill, what does your wheelbase end up with that swingarm.......looks good.

Mick

HavocTurbo · « **Reply #130 on:** July 16, 2009, 06:08:20 pm »

Mick you don't have enough experience...

My 22 years says it'll do just fine!!!

Looking good man! You're making me jealous.

DollarBill · « **Reply #131 on:** July 16, 2009, 06:42:42 pm »

From the center of the pivot the stock swingarm is 20" and the 600rr swingarm is 24". Depending on the length of the chain there is a couple of inches possibly to play with. I want to say that when I had the forks and wheels on it that the wheelbase turned out to be 60". I can't remember for sure but I did measure it.

So definitely longer....but not out of control like some of the stretch jobs you see these days. My goal is to make it look balanced and run/handle well....not like a racer or a 600rr for that matter but to be a little unique at the same time.

Tonight I ground the stock shock mounts off the frame and the seat latch and the 600rr tail fits a lot better. Looking at it closer I think this is going to work really well. I'm excited about it.

By the way does anyone want a stock 750F swingarm?

Retro Rocket · « **Reply #132 on:** July 16, 2009, 07:30:25 pm »

Quote

Mick you don't have enough experience... Grin

My 22 years says it'll do just fine!!! Cheesy Cheesy Cheesy Cheesy

How am i supposed to compete Havoc, you are 1726 years old.....

Mick

Retro Rocket · « **Reply #133 on:** July 16, 2009, 07:34:09 pm »

Quote

From the center of the pivot the stock swingarm is 20" and the 600rr swingarm is 24". Depending on the length of the chain there is a couple of inches possibly to play with. I want to say that when I had the forks and wheels on it that the wheelbase turned out to be 60". I can't remember for sure but I did measure it.

So definitely longer....but not out of control like some of the stretch jobs you see these days. My goal is to make it look balanced and run/handle well....not like a racer or a 600rr for that matter but to be a little unique at the same time.

Tonight I ground the stock shock mounts off the frame and the seat latch and the 600rr tail fits a lot better. Looking at it closer I think this is going to work really well. I'm excited about it.

By the way does anyone want a stock 750F swingarm?

Thanks Bill, i am always interested in these conversions but also like to keep the wheel base reasonable, i do like corners...

Mick

DollarBill · « **Reply #134 on:** July 16, 2009, 08:14:48 pm »

I'll keep ya posted on what the final wheelbase turns out to be.

Retro Rocket · « **Reply #135 on:** July 16, 2009, 08:16:59 pm »

I am using a cut down swingarm from a gsxr1100J but have cut it down and turned it into a twin shock arm, still to fit the bigger rear wheel i am using i had to leave it about 45mm longer than stock.

Mick

GoatBaSS · « **Reply #136 on:** September 09, 2009, 06:08:58 am »

Wazz up! I am in and wait with bleary eyes...

DollarBill · « **Reply #137 on:** September 09, 2009, 06:36:31 am »

Unfortunately life has thrown me a curve ball and I will be taking some time off from my project for a while so that I can focus on more important things.

Eventually I will get back to it.....just don't know when.

GoatBaSS · « **Reply #138 on:** September 10, 2009, 05:49:57 am »

I know. That "money" I came up with turned into a plumber. And my "project" morphed into Alabama Dept of acute indoor flood control and floor replacement. Meanwhile I am having to "negotiate" a new job with a 800 lbs. Gorilla in a room. I guess I will have to re enforce their "clarity" so I add to their vision.

Ecosse · « **Reply #139 on:** September 10, 2009, 12:28:10 pm »

best wishes bill.

and goat.

babyfood1217 · « **Reply #140 on:** September 25, 2009, 09:13:53 pm »

Just got a new toy to aid in my monoshock idea, thanks to you dollarbill

I'm still a bit leery of the way you chopped your frame to fit the SA (god knows I've done worse, right guys

), so my approach will be this: I will fabricate a set of pockets in which the ends of the SA pivots will sit. These pockets will sit in the same location as the stock SA pivot on the frame, but will sit outboard of the existing holes. Essentially, I'll take the pocket, locate its' dimensions on the stock frame, cut a portion of the stamped steel out, and weld these pockets in place, allowing the frame to remain free of any strain (as slight as it may be) from stretching outward to accomdate the SA pivot width. Lots of drawing, measuring and planning to do, but it's my start!

-Chris

HavocTurbo · « **Reply #141 on:** September 25, 2009, 10:33:37 pm »

babyfood...

Why not turn down the swingarm to fit the frame? Then no modifications to the cherry "Stock" frame.

Having only seen the side of your newly acquired item I can only assume...

Of course I'm an ass so...

You know what that makes you.

babyfood1217 · « **Reply #142 on:** September 26, 2009, 11:53:23 am »

Quote from: HavocTurbo on September 25, 2009, 10:33:37 pm

babyfood...
Why not turn down the swingarm to fit the frame? Then no modifications to the cherry "Stock" frame.

As D-bill already found out, these SA's are rather uniquely put together. Thin cast sections welded to tubular and sheet make for a strong unit, but the thickness (or rather lack of) of the cast means pretty much any machining done to it will be a penetrating cut, reducing strength and integrity (this is why D-bill stretched his frame apart.) Besides, the frame I'll be doing this do has seen way to many welders and cut off disc to be called "cherry!

Quote

Having only seen the side of your newly acquired item I can only assume...

What do they say, "assuming only makes an ass out of you and me..."

Quote

Of course I'm an ass so... You know what that makes you.

That'd make me a... wait... damn! Fooled again!

-chris

HavocTurbo · « **Reply #143 on:** September 26, 2009, 12:33:28 pm »

Chris....

I had to look at that picture about 5 times to realize it was the same swing arms as DB's.

My bad.

Hush · « **Reply #144 on:** September 27, 2009, 12:03:02 pm »

Ah I remember this project, named after the nest of wasps you found in the bike.

Hope you can advance it when you get a chance, what you have looks damn great.

DollarBill · « **Reply #145 on:** September 28, 2009, 05:42:03 pm »

Ecosse, thanks for the well wishes! Sometimes life can be tough...especially when it comes to love and marriage. I don't know yet what the future holds but I am praying for happiness for us both.

babyfood.....good for you! I can't wait to see what you do with that swingarm. They are pretty darn cool when you get them in your hands!!!

Havoc...I know we have some things up in the air and I do hope to work with you but if you need to move on to get things done....I understand. I still need a few months I think to get focused again.

Thanks Hush....I sure hope to finish it one day!!1

HavocTurbo · « **Reply #146 on:** September 28, 2009, 10:35:56 pm »

Anything I'm doing Bill is always un-doable...

Get yourself back in the world and no problems man.

Hope everything works out alright.

Hush · « **Reply #147 on:** September 30, 2009, 04:25:17 am »

I hear you loud and clear Dollarbill, sort the important stuff and like a neglected 30 year old barn find, we will still be here wait'n for ya.

Good thoughts bro..........Hush.

babyfood1217 · « **Reply #148 on:** October 01, 2009, 02:51:30 pm »

Dbill-

I'm curious about where you chose to mount the dogbone linkage on the frame. Did you measure off the stock cbr??? Cuz I just did

Stocking spacing from SW pivot to dogbone pivot, center to center is 6.250. Now that's from a 2006 cbr600rr. Rear shock valving didn't change really from the initial few years these unit prolinks were on the 6's. Weights were similar within the 6's from model year to the next, so I'm imagining the measurement could transcend too.

Also, the weight of the cb750 with a rider (well, at least me) is well below the max weight/load limits of the 6's, so these shocks should need to be revalved/resprung at all. Sweet.

Dbill, I know you got a lot on your plate. I'll be stoked when things get settled for you, because we're gonna have to meet up and laugh at each other for what we are doing to these damn bikes.

-Chris

cdoggy81 · « **Reply #149 on:** December 22, 2009, 01:16:23 am »

DollarBill,
Just checking in to see how you are doing. Hope all is well & look forward to any updates

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Author Topic: 1975 CB750F - Project Yellow Jacket (Read 57808 times)