Topic: 72 cb750 Project,GSXR front end- Version 2.0 coming

[edwardmorris]

Any one have a spare one sitting around that they would be willing to sell?

Try PMing Bill Benton, he may have one...

[iron_worker]

You could try lapping it flat ... use some contact cement or something to glue some sandpaper down to a pane of glass (or a very flat surface ... granite surface plate would be best but not everyone has one). Drag the cover over the sandpaper (maybe 320 grit?) and keep checking ... the high spots will be easily spotted after a few strokes and the low spots will be untouched.

This method only works if your case gasket surface is not also somehow warped ... but I doubt that.

IW

[jojo]

Well if its not one thing its another. I managed to get the cover to seal completely. Now that the carbs have been synced im sputtering through the mid revs but only while its riding, not if its in neutral. Gonna double check my wires to make sure they are getting spark, plugs, and jets to make sure nothing is out of the ordinary?

any other suggestions on what might be making it sputter all of a sudden?

[CognitoMoto]

As you've undoubtedly seen from numerous posts, Devin is an extremely good guy and his hubs (and other parts) are very well-made. I've dealt with him a fair bit, and met him a few times. Each time, I've come away from my dealings and interactions with him I've been pleased and impressed.

I do know he has the hubs contracted to him as he does not currently own a CNC mill. His other parts I believe he's moving in-house, especially now that his shop is up and running.

Best of luck on your hubs-

I wonder if i could use that front hub , with different bearings, on a 1989 GSXR1100K front end...?

If you go to Devin's website, there are some cad drawings and specified years. You could ask him for some additional measurements (I'd take some for you, but mine is laced now).

I wonder if i could use that front hub , with different bearings, on a 1989 GSXR1100K front end...?

I follow this build and saw all this. Sorry for the late reply. We are working on 4 different hubs now. CBR600/ 2003 GSXR / 93 GSXR / CBR1000. These seam to be popular request so we have pursued them. We can make a hub for any application. All I really need is the oem wheel to pull dimensions from.

Cal, the family business is machining and we own a full blown machine shop with CNC and all. We manufacture everything we can in house. The machine shop is in actually located in Richmond.


www.CognitoMoto.com

[calj737]

Sorry, Devin. Didn't mean to imply that your machine work wasn't being done, as I know from our conversations the family history. Should have said "used to be" but I thought I had written it clearly enough in saying "moved in-house now..."

I hope that now that the machine shop is in full production, you'll be visiting more frequently and that leads to a ride! Call me as you get by, lunch will be on me-

[iron_worker]

If it's only sputtering in mid range I would suspect air:fuel issue as opposed to electrical. Electrical would usually either be a problem all the time or it would come on randomly/intermittently.

Is it idling better after the sync?

IW

[jojo]

If it's only sputtering in mid range I would suspect air:fuel issue as opposed to electrical. Electrical would usually either be a problem all the time or it would come on randomly/intermittently.

Is it idling better after the sync?

IW

Idles way better after the sync, the electrical checked out and also the timing advance mark "F" moves as it should. I believe the new pods may be the culprit. looks like i will need to rejett my carbs to match the new pods. already replaced my plugs and no change in the issues. Definitely sounds like its starving for fuel.

[jojo]

fixed a small air leak but i tested the timing advancer with the light and it wasnt working correctly. Gonna do a full rebuild on the carbs, resync, then fix the advancer and voila! should be done finally.

[iron_worker]

If it's only sputtering in mid range I would suspect air:fuel issue as opposed to electrical. Electrical would usually either be a problem all the time or it would come on randomly/intermittently.

Is it idling better after the sync?

IW

Idles way better after the sync, the electrical checked out and also the timing advance mark "F" moves as it should. I believe the new pods may be the culprit. looks like i will need to rejett my carbs to match the new pods. already replaced my plugs and no change in the issues. Definitely sounds like its starving for fuel.

Oh .... pods....

Yep, there's your problem! lol

IW

[jojo]

Yep, they were already on there when i first got it so i had to replace them bc the seals on them were falling apart and they were dirty as can be 

[jojo]

still fighting jetting problems, but things have halted for now as on my way to the revival show some lady decided to jump out on the intersection and forced me to put my bike down(not my honda) and managed to bang myself up pretty good and break my left elbow. wont be able to work much for the next few weeks but at least im ok!

[SOHC4 Cafe Racer Fan]

still fighting jetting problems, but things have halted for now as on my way to the revival show some lady decided to jump out on the intersection and forced me to put my bike down(not my honda) and managed to bang myself up pretty good and break my left elbow. wont be able to work much for the next few weeks but at least im ok!

Ouch!!  That sounds really really painful.  She's lucky you didn't ride over her like the Toecutter gang in Mad Max.  I'd make her pay for your hospital bill and bike repair.

[Seeparkfly]

Couple of questions for yall.

1.) cb550 swing arm is a bit longer than the 750 so my chain is now too short. What is the better solution, new chain(current chain isnt but a few months old) or smaller rear sprocket?

2. anyone make brake lines? the current line for my second caliper is too short (old wheel was smaller, 17 inch vs 19 inch) and now it rubs against the wheel.

3.) carbs seem to be sticking, not sure if its the cable or a bad return spring will be loading a video soon.

Thanks again everyone for your help, im almost there. 

Hey JoJo,
Sweet bike man. I'm glad I found your thread bc I've been thinking about a longer swingarm. After seeing photos for comparison I'm in.  Did you get a longer chain? If so what length? I have a 76 CB750 F and hoping the swap is the same as yours.

[SOHC4 Cafe Racer Fan]

Hey JoJo,

Sweet bike man. I'm glad I found your thread bc I've been thinking about a longer swingarm. After seeing photos for comparison I'm in.  Did you get a longer chain? If so what length? I have a 76 CB750 F and hoping the swap is the same as yours.


Couple of questions for yall.

1.) cb550 swing arm is a bit longer than the 750 so my chain is now too short. What is the better solution, new chain(current chain isnt but a few months old) or smaller rear sprocket?

2. anyone make brake lines? the current line for my second caliper is too short (old wheel was smaller, 17 inch vs 19 inch) and now it rubs against the wheel.

3.) carbs seem to be sticking, not sure if its the cable or a bad return spring will be loading a video soon.

Thanks again everyone for your help, im almost there. 

[/quote]

(1) Buy a new chain.  A new sprocket will affect the gearing.

(2) Slingshot (member here on the forum) makes steel braided brake lines at an affordable price (discount for forum members, too).

[Seeparkfly]

Hey JoJo,

Sweet bike man. I'm glad I found your thread bc I've been thinking about a longer swingarm. After seeing photos for comparison I'm in.  Did you get a longer chain? If so what length? I have a 76 CB750 F and hoping the swap is the same as yours.


Couple of questions for yall.

1.) cb550 swing arm is a bit longer than the 750 so my chain is now too short. What is the better solution, new chain(current chain isnt but a few months old) or smaller rear sprocket?

2. anyone make brake lines? the current line for my second caliper is too short (old wheel was smaller, 17 inch vs 19 inch) and now it rubs against the wheel.

3.) carbs seem to be sticking, not sure if its the cable or a bad return spring will be loading a video soon.

Thanks again everyone for your help, im almost there. 

(1) Buy a new chain.  A new sprocket will affect the gearing.

(2) Slingshot (member here on the forum) makes steel braided brake lines at an affordable price (discount for forum members, too).
[/quote]

Thanks for the info. Do you know the length of chain I will need?

[SOHC4 Cafe Racer Fan]

Hey JoJo,

Sweet bike man. I'm glad I found your thread bc I've been thinking about a longer swingarm. After seeing photos for comparison I'm in.  Did you get a longer chain? If so what length? I have a 76 CB750 F and hoping the swap is the same as yours.


Couple of questions for yall.

1.) cb550 swing arm is a bit longer than the 750 so my chain is now too short. What is the better solution, new chain(current chain isnt but a few months old) or smaller rear sprocket?

2. anyone make brake lines? the current line for my second caliper is too short (old wheel was smaller, 17 inch vs 19 inch) and now it rubs against the wheel.

3.) carbs seem to be sticking, not sure if its the cable or a bad return spring will be loading a video soon.

Thanks again everyone for your help, im almost there. 

(1) Buy a new chain.  A new sprocket will affect the gearing.

(2) Slingshot (member here on the forum) makes steel braided brake lines at an affordable price (discount for forum members, too).

Thanks for the info. Do you know the length of chain I will need?
[/quote]

No.  I do not have the measurement.  But it's my understanding that the 550 swingarm you are using is approximately 2" longer than the stock 750 swingarm.  If so, you would need a chain 4" longer than a stock 750 chain.

[calj737]

Buy a 110 link chain, then adjust to fit. Remember to fit it based upon your axle being farthest forward in the swing arm. Then take slack out by moving axle rear ward. Pretty simple...

[Seeparkfly]

i also decided against welding the holes on the rear of the frame after im chopped it up a bit. I think in the future i may weld a loop in there so i used welding plugs to seal them up. Fit right in there super snug and used some sealant to keep the moisture out.

Uploaded with ImageShack.com

Need to do the same for my bike, where did you find the plugs??

[riverfever]

Love the build. Any more pics of the seat mounting?

[CognitoMoto]

i also decided against welding the holes on the rear of the frame after im chopped it up a bit. I think in the future i may weld a loop in there so i used welding plugs to seal them up. Fit right in there super snug and used some sealant to keep the moisture out.

Uploaded with ImageShack.com

Need to do the same for my bike, where did you find the plugs??

I want to see someone put bar end turn signals in there.


www.CognitoMoto.com

[SOHC4 Cafe Racer Fan]

i also decided against welding the holes on the rear of the frame after im chopped it up a bit. I think in the future i may weld a loop in there so i used welding plugs to seal them up. Fit right in there super snug and used some sealant to keep the moisture out.

Uploaded with ImageShack.com

Need to do the same for my bike, where did you find the plugs??

I want to see someone put bar end turn signals in there.


www.CognitoMoto.com

Great idea.  Motogadget makes some pricey but cool looking ones!

[calj737]

You'd have to use their "cones" as the "discs" wouldn't project back, only side view for the light.

These are their discs, notice the blacked top element to force light out the side?

[Seeparkfly]

Buy a 110 link chain, then adjust to fit. Remember to fit it based upon your axle being farthest forward in the swing arm. Then take slack out by moving axle rear ward. Pretty simple...

Got it. Thank you.

[jojo]

Couple of questions for yall.

1.) cb550 swing arm is a bit longer than the 750 so my chain is now too short. What is the better solution, new chain(current chain isnt but a few months old) or smaller rear sprocket?

2. anyone make brake lines? the current line for my second caliper is too short (old wheel was smaller, 17 inch vs 19 inch) and now it rubs against the wheel.

3.) carbs seem to be sticking, not sure if its the cable or a bad return spring will be loading a video soon.

Thanks again everyone for your help, im almost there. 

Hey JoJo,
Sweet bike man. I'm glad I found your thread bc I've been thinking about a longer swingarm. After seeing photos for comparison I'm in.  Did you get a longer chain? If so what length? I have a 76 CB750 F and hoping the swap is the same as yours.

1. the 550 swing arm is a bit longer, close to 2"(mine was off a 78). I too had a newer chain but i opted to change it out for a longer one instead of messing with the sprockets.

[jojo]

i also decided against welding the holes on the rear of the frame after im chopped it up a bit. I think in the future i may weld a loop in there so i used welding plugs to seal them up. Fit right in there super snug and used some sealant to keep the moisture out.

Uploaded with ImageShack.com

Need to do the same for my bike, where did you find the plugs??

those are just welding plugs i found on ebay to match the hole size of the frame