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Author Topic: 72 cb750 Project,GSXR front end- Version 2.0 coming  (Read 52993 times)

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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End-- Wheels are done!!
« Reply #100 on: October 24, 2013, 02:50:06 PM »
also, in case any one is wondering i used dunlop 404 series tires on both the front and back.

Front- 100/90  19"
Rear-  120/90  18"

http://www.bikebandit.com/dunlop-d404-motorcycle-tire?WT.mc_id=googlemerchantfeed&utm_source=feed&utm_medium=merchantfeed&utm_campaign=pla&gclid=CMupkZ25sLoCFcnm7AodhycAvw
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End-- Wheels are done!!
« Reply #101 on: October 25, 2013, 08:25:25 AM »
How important is the rear bearing retainer? mine was damaged when it was removed. Can i ride without it or is absolutely critical?
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Offline jpfrk2001

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Re: 72 cb750 Engine Rebuild/ GSXR Front End-- Wheels are done!!
« Reply #102 on: October 25, 2013, 03:29:37 PM »
Quote from: jojo on October 24, 2013, 02:37:29 PM
https://imageshack.com/i/mj8hpgj

https://imageshack.com/i/b83h1yj

finally got my wheels all laced up and trued and the tires are mounted and balanced. more progress finally. Still going to have the rotors redrilled to have them fit the new harley hub.

To those considering this GSXR swap... after doing it myself, sourcing, parts having spacers, buying new rotors etc i wouldn't do it again. I would just buy the plug and play hub instead. I ended up spending more money this way than if i had just bought it and used my current wheel, bearings, rotors, and calipers. It would have been a lot less work, about a 150 less, and less headaches and custom fab work (caliper spacers, hubcentric rings, buying new rotors)


Live and learn  :o

This was what I was waiting for my self. I was unsure of really which way to go my self. I havn't bought a hub yet, but this just confirms to just get the one from Cognito moto.

Also, How fat is that rear tire. I was thinking of going with a wider 4.5" or 5.5" rear rim and a 150 or 160/50R18 rear wheel.
« Last Edit: October 25, 2013, 03:31:29 PM by jpfrk2001 »
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End-- Wheels are done!!
« Reply #103 on: October 26, 2013, 07:02:11 PM »
Quote from: jpfrk2001 on October 25, 2013, 03:29:37 PM
Quote from: jojo on October 24, 2013, 02:37:29 PM
https://imageshack.com/i/mj8hpgj

https://imageshack.com/i/b83h1yj

finally got my wheels all laced up and trued and the tires are mounted and balanced. more progress finally. Still going to have the rotors redrilled to have them fit the new harley hub.

To those considering this GSXR swap... after doing it myself, sourcing, parts having spacers, buying new rotors etc i wouldn't do it again. I would just buy the plug and play hub instead. I ended up spending more money this way than if i had just bought it and used my current wheel, bearings, rotors, and calipers. It would have been a lot less work, about a 150 less, and less headaches and custom fab work (caliper spacers, hubcentric rings, buying new rotors)


Live and learn  :o

This was what I was waiting for my self. I was unsure of really which way to go my self. I havn't bought a hub yet, but this just confirms to just get the one from Cognito moto.

Also, How fat is that rear tire. I was thinking of going with a wider 4.5" or 5.5" rear rim and a 150 or 160/50R18 rear wheel.


its much easier to do it, no need to worry about spacer and fabbing up other parts. i used the stock rear rim.  tire is a 120, i originally was going with a 160 and 4.5" wheel but its too expensive after, new spokes, wheel, offset sprockets etc. plus, i really like the old look of skinny tires.
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End-- Wheels are done!!
« Reply #104 on: November 18, 2013, 11:51:46 AM »
Finally some progress.

fabricated a new seat pan since that abs plastic stuff is too soft. I used rivets to attach it to the seat. Then i used threaded pop rivets to mount them to the frame using studs and butterfly nuts. fits like a charm

Uploaded with ImageShack.com


this picture shows the new 550 swing arm i used instead of the 750. the 550 has a tubular type swing arm and i like the way it flows with the frame instead of the 750's boxed type.
Uploaded with ImageShack.com
« Last Edit: November 18, 2013, 11:53:22 AM by jojo »
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #105 on: November 18, 2013, 11:55:50 AM »
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
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Jay Ace

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #106 on: November 18, 2013, 12:00:16 PM »
Good call on those plugs. Looks great!
Might have to steal that idea  ;D
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #107 on: November 18, 2013, 12:02:24 PM »
also had some spacers machined to make the hayabusa rotors hubcentric.

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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #108 on: November 18, 2013, 12:06:32 PM »
got some new goodies in.
new grips and aluminum stem for gsxr swap.


Uploaded with ImageShack.com

pressed out the old one and installed the new one and voila 

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Uploaded with ImageShack.com

It fits right up!

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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #109 on: November 18, 2013, 12:09:51 PM »
Uploaded with ImageShack.com

Uploaded with ImageShack.com

Uploaded with ImageShack.com

Uploaded with ImageShack.com

Uploaded with ImageShack.com


still mocking the rear end up so i can get the spacing correct

Uploaded with ImageShack.com
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #110 on: November 18, 2013, 12:10:41 PM »
a before and after of what i have so far.  :)

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Offline lwahples

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #111 on: November 18, 2013, 02:52:08 PM »
Really coming along nice.Like the seat!
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Offline Sgt.Pinback

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #112 on: November 18, 2013, 03:00:12 PM »
Can´t wait to see it finished!
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Offline greenjeans

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #113 on: November 18, 2013, 04:22:35 PM »
Looks great so far.   I love the look of the inverted forks on these old bikes.  I'm glad you went with spokes - cast wheels just look so wrong
with these old bikes.  keep it going.
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Offline Sgt.Pinback

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #114 on: November 18, 2013, 10:56:57 PM »
Whats that helmet and where can I find one? That looks groovy!
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Offline SOHC4 Cafe Racer Fan

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #115 on: November 19, 2013, 07:57:56 AM »
Nice progress, Jojo.
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Offline squirley

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #116 on: November 19, 2013, 08:18:46 AM »
Looks good Jojo! I take it that new steering stem was an easy and perfect fit swap? Keep it coming!
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Offline SKTP

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #117 on: November 19, 2013, 10:47:46 AM »
So good
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #118 on: November 20, 2013, 09:07:14 AM »
Quote from: lwahples on November 18, 2013, 02:52:08 PM
Really coming along nice.Like the seat!

thanks, im glad you like it. That seat is probably one of my top 3 favorite things on this bike.
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #119 on: November 20, 2013, 09:09:51 AM »
Quote from: Sgt.Pinback on November 18, 2013, 03:00:12 PM
Can´t wait to see it finished!

Me either, i expected this build to be a quick engine build and it turned into an entire tear down. Engine is almost done so i am aiming for dec 24. Make it a christmas present to myself.

Quote from: SKTP on November 19, 2013, 10:47:46 AM
So good

thanks, im really glad you like it. Ive poured everything (blood, sweat, a million and one curse words) at this project and im glad others can appreciate my struggle.
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #120 on: November 20, 2013, 09:10:59 AM »
Quote from: greenjeans on November 18, 2013, 04:22:35 PM
Looks great so far.   I love the look of the inverted forks on these old bikes.  I'm glad you went with spokes - cast wheels just look so wrong
with these old bikes.  keep it going.

I debated this for about 2 weeks and after seing both styles i had to go with the spokes. while they may be a pain to lace, true and maintain you just cant replace that look.
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #121 on: November 20, 2013, 09:12:11 AM »
Quote from: Sgt.Pinback on November 18, 2013, 10:56:57 PM
Whats that helmet and where can I find one? That looks groovy!


I actually found that helmet at a flea market, cost me all of 5 bucks, and lucky for me its dot approved ( at least thats what the sticker says). the bubble shield is a universal one i found on ebay.
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Offline jojo

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Re: 72 cb750 Engine Rebuild/ GSXR Front End--Houston we have a roller!
« Reply #122 on: November 20, 2013, 09:14:29 AM »
Quote from: CB750 Cafe Racer Fan on November 19, 2013, 07:57:56 AM
Nice progress, Jojo.

Thank you sir!
Quote from: squirley on November 19, 2013, 08:18:46 AM
Looks good Jojo! I take it that new steering stem was an easy and perfect fit swap? Keep it coming!

Squirley- yes you are correct, made it so much easier to do. just bolts right up like it if was stock. Devin did a great job designing it and fabricating it.  he even added a touch at the bottom that gets rid of the stock retaining ring and makes its a perfect press fit. I would recommend it to anyone in a heartbeat.
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Offline jojo

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Re: 72 cb750 Project,GSXR Front end--Engine rebuild almost done
« Reply #123 on: December 03, 2013, 12:34:13 PM »
Finally some more updates.

media blasted the valve cover and painted it.






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Offline jojo

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Re: 72 cb750 Project,GSXR Front end--Engine rebuild almost done
« Reply #124 on: December 03, 2013, 12:40:52 PM »
also installed the piston rings, cylinders, head, tensioner cam/sprocket, rocker assembly. Everything has been torqued down and tappets have been adjusted as well.













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