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

[SOHC4 Cafe Racer Fan]

I got my 550 pipe from Lossa Engineering.

[jojo]

Did you get a new set of gsxr forks? I searched the earlier pages but never saw anything about you needing to replace them. Your bike looks awesome! I am hoping someday to do a similar setup on my 550. Do you have any clearance issues with the 19" front wheel?

Indeed i did get new forks. When I moved the bike to my new place we accidentally over tightened the front end and busted the left fork seal. You need to replace the oil on both forks at the same time but I didnt have some of the tools to do it. I already spent a ton on tools so I decided that buying a new set of forks was cheaper than to pay the 250 for labor and parts. I have spare parts I will putting up for grabs (gsxr forks, rebuilt gsxr master cylinder, gsxr front fender among others) so be on the lookout .

As far as clearance goes I have plenty of space. Ill take a pic for you and post it tomorrow morning.

[jojo]

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

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Jojo,

I know this was further back in your thread, but I was interested in the mods to your DCC seat.  Is the base of the seat made out of ABS plastic vs. metal?  Did you remove the seat base before attaching an aluminum pan?

I'm curious as I was thinking of using the DCC seat for an upcoming 550 project.  It's between the DCC seat, a fiberglass Carpy seat, or a bratstyle flat seat with a removable cowl hump.

Don

THe base is made out of abs plastic. I originally tried to install the pop rivets in the plastic but jt was way too soft and gave in when I tried to install it. I used the aluminum sheet to add rigidity to the seat pan, after I riveted the pan to the plastic it was much sturdier and easy to adjust. The pop rivet tool was 50 bucks plus another 10 for the actual rivets so its not a bad investment. I used wing nuts to fasten the seats to the frame and its super easy to remove and has height adjustability as well. Its very rudimentary but it works. Ill post some more pics for ya

[jojo]

question for the wiring guys? I used the original GSXR controls and spliced them to my Honda harness. Now, I don't have high or low beam and tail light does not work unless I hit the brake lever. 

[CognitoMoto]

question for the wiring guys? I used the original GSXR controls and spliced them to my Honda harness. Now, I don't have high or low beam and tail light does not work unless I hit the brake lever. 

Just have to chase wires. Sounds like the high beam is getting its power signal through brake switch. Start at the hand control high beam wire.


www.CognitoMoto.com

[jojo]

I got my 550 pipe from Lossa Engineering.

do you have any sound clips of it?

im debating between that one and the carpy system

[SOHC4 Cafe Racer Fan]

Jojo,

I'll see if I can make you clip of it this weekend.  I just had to replace the sump gasket (leaking) and I'm swapping out the old control switches for the NOS ones I took off my 750K7.  I'll have it ready for riding this weekend.

The Lossa pipe looks fairly identical to the Carpy pipe.  It's a one-piece design and does not have the spring tension mounts to the head (as distinguished from the MotoGP Werks pipe).  Fitment was superb and it came with a mounting tab to the passenger peg.  I believe that Carpy's pipe hangs free from the head, unless you fabricate a mounting tab.  Just my $0.02 but I think this is a key difference. 

I got mine ceramic coated black.  Both the Lossa pipes and Carpy pipes are priced the same for bare stainless -- $350.  I do not know who is making Carpy's pipes anymore.  He used to use Power Pros Exhaust, but I think they are no longer operating, and that MotoGP Werks bought their jigs/tooling.

I think that the MotoGP Werks design is inherently superior, since you can replace the tail section if it becomes damaged, and it provides for easier removal with the springs.  That said, I think the Lossa pipe is a great product and value.

Don

[sethdhawkins]

I'll say, that I would not buy another Carpy pipe. The fit was/is horrific. Spend a few more bucks for something better.

[jojo]

I'll say, that I would not buy another Carpy pipe. The fit was/is horrific. Spend a few more bucks for something better.

Jojo,

I'll see if I can make you clip of it this weekend.  I just had to replace the sump gasket (leaking) and I'm swapping out the old control switches for the NOS ones I took off my 750K7.  I'll have it ready for riding this weekend.

The Lossa pipe looks fairly identical to the Carpy pipe.  It's a one-piece design and does not have the spring tension mounts to the head (as distinguished from the MotoGP Werks pipe).  Fitment was superb and it came with a mounting tab to the passenger peg.  I believe that Carpy's pipe hangs free from the head, unless you fabricate a mounting tab.  Just my $0.02 but I think this is a key difference. 

I got mine ceramic coated black.  Both the Lossa pipes and Carpy pipes are priced the same for bare stainless -- $350.  I do not know who is making Carpy's pipes anymore.  He used to use Power Pros Exhaust, but I think they are no longer operating, and that MotoGP Werks bought their jigs/tooling.

I think that the MotoGP Werks design is inherently superior, since you can replace the tail section if it becomes damaged, and it provides for easier removal with the springs.  That said, I think the Lossa pipe is a great product and value.

Don

Thanks for the input guys. I think what im going to do is have a local exhaust guy fab up the second half of my exhaust to match that yoshimura look/sound and then have him ceramic coat the whole thing. I currently have 4 to 1 pipes that came with the bike when i bought it. It sounds nice but its  quieter than I would like it to be. from what I have read not to many people are overly excited about carpy's so I will stay with my current pipes just a bit modded.


they do a lot of custom exhausts and work mostly with older bikes.
http://www.jemcoexhaust.com/

[SOHC4 Cafe Racer Fan]

I'll say, that I would not buy another Carpy pipe. The fit was/is horrific. Spend a few more bucks for something better.

Jojo,

I'll see if I can make you clip of it this weekend.  I just had to replace the sump gasket (leaking) and I'm swapping out the old control switches for the NOS ones I took off my 750K7.  I'll have it ready for riding this weekend.

The Lossa pipe looks fairly identical to the Carpy pipe.  It's a one-piece design and does not have the spring tension mounts to the head (as distinguished from the MotoGP Werks pipe).  Fitment was superb and it came with a mounting tab to the passenger peg.  I believe that Carpy's pipe hangs free from the head, unless you fabricate a mounting tab.  Just my $0.02 but I think this is a key difference. 

I got mine ceramic coated black.  Both the Lossa pipes and Carpy pipes are priced the same for bare stainless -- $350.  I do not know who is making Carpy's pipes anymore.  He used to use Power Pros Exhaust, but I think they are no longer operating, and that MotoGP Werks bought their jigs/tooling.

I think that the MotoGP Werks design is inherently superior, since you can replace the tail section if it becomes damaged, and it provides for easier removal with the springs.  That said, I think the Lossa pipe is a great product and value.

Don

Thanks for the input guys. I think what im going to do is have a local exhaust guy fab up the second half of my exhaust to match that yoshimura look/sound and then have him ceramic coat the whole thing. I currently have 4 to 1 pipes that came with the bike when i bought it. It sounds nice but its  quieter than I would like it to be. from what I have read not to many people are overly excited about carpy's so I will stay with my current pipes just a bit modded.


they do a lot of custom exhausts and work mostly with older bikes.
http://www.jemcoexhaust.com/

Just to clarify, the Lossa pipe is not the same as Carpy's.  Same basic design but I believe Lossa uses a different supplier/manufacturer.

[jojo]

got it. I like the bikes they have built for cafe racer tv.

on another note, hopefully i will be able to update the thread tonight. got my mirrors, plate holder , alternate tail light installed. also managed to fix the relay issue. have some pics to go with it

[PGF550F]

Hey jojo, have you figured out what change in trail that the modern forks with less offset will give you? I would be interested to hear any comparison you have over stock if you have ridden it much to compare.  Your build certainly has inspired me to look into something like this for my 550. 

[jojo]

I havent....yet. Im actually going visit a shop to have them give me the full detail and have it setup for me because I want to have it dialed it and ready to go as soon as the weather clears up.  Right now im waiting for a new clutch cover gasket as i managed to ruin the last one when i was changing out the springs.

[02z06dave]

Where did you get the rod for the rear brake?  Ive been looking for something like that for mine.

Your bike looks awesome! Nice work

[jojo]

Where did you get the rod for the rear brake?  Ive been looking for something like that for mine.

Your bike looks awesome! Nice work

Thank you sir, glad you like it def means alot.

I actually picked up the rod linkage for the rear from Motobits.com--- super helpful, great customer service and even better prices. Give them a shout and they will hook you up.

[Calumjs]

Sorry to ask a stupid question, why is there a need for using a different hub for the front wheel? Is it because the front wheel of the gsxr is a different size than the stock front wheel?


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[SOHC4 Cafe Racer Fan]

Sorry to ask a stupid question, why is there a need for using a different hub for the front wheel? Is it because the front wheel of the gsxr is a different size than the stock front wheel?


Sent from my iPhone using Tapatalk

The stock CB750 hub is narrower than the GSXR hub.  To use the stock hub, you would need to machine spacers to place between the hub and brake discs, so that the discs are properly aligned for the spacing of the calipers provided by the mount points on the GSXR forks.  The hub provides for the correct amount of spacing to simply bolt on the discs to be properly aligned for the calipers while retaining a spoked wheel.  Then all you have to do is lace up the hub.  Plug and play.

[calj737]

...and of course, the GSXR axle now fits both the hub and the fork legs ;-)

The front hub also uses an inside-inside lacing pattern (on the 550 anyway) to provide clearance for the spokes the miss the backside of the calipers. As CB750 said, plug and play!

[Retro Rocket]

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

[sethdhawkins]

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).

[calj737]

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

I have the hub also for an upcoming build. The axle shaft thru the hub is enormous and different bearings are definitely an option for different fitment. Obviously, the width and rotor spacing is fixed and will determine your fitment compatibility.

[Retro Rocket]

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

I have the hub also for an upcoming build. The axle shaft thru the hub is enormous and different bearings are definitely an option for different fitment. Obviously, the width and rotor spacing is fixed and will determine your fitment compatibility.

Looking at the hub theres plenty of scope to remove some material or make spacers up to make the discs line up with my front ends, or measure my 1100 front wheel and give the dimensions to cognito and have him machine  them to suit..  I need at least 2 front hubs, maybe 3...

[calj737]

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-

[jojo]

Sorry to ask a stupid question, why is there a need for using a different hub for the front wheel? Is it because the front wheel of the gsxr is a different size than the stock front wheel?


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no such thing as a stupid question. i asked myself the exact same thing when i started figuring out all the parts for my build. hopefully everyone was able to help with your questions.

glad to see more helpful discussion on the thread

[jojo]

So I have been trying to fine tune the last bit of details before I can take her out for a long trip and today I that the reason my clutch cover was leaking was not a bad gasket but instead it was  a warped cover. I tried it without gasket cinch and it sucked it right in.  then used gasket cinch and it still wouldnt sit flat so now i have to source a clutch cover.

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