Author Topic: gsxr fork on cx100 hot rod (Read 5762 times)

harrytief · « **on:** March 20, 2018, 10:03:46 AM »

I took some new pics of the fork mod on my cx100. The brief write up is in the archives. Once fettled, this bike is a revelation to ride.

Pancake · « **Reply #1 on:** March 20, 2018, 02:41:20 PM »

Nice! Did you use the same offset?

radguzzi · « **Reply #2 on:** March 20, 2018, 04:41:21 PM »

What a sanitary set up... wow...!

Rob_

Guzzistajohn · « **Reply #3 on:** March 20, 2018, 06:02:41 PM »

Good work!

harrytief · « **Reply #4 on:** March 20, 2018, 06:48:46 PM »

Thanks for your generous comments.
All I can say is that I may have too much time on my hands...not.
Pancake. The fork offset is the gsxr's 30mm and the top triple is custom. Seems even more stable than stock tho' the steering damper is there "just in case".
Harry

73eldorado · « **Reply #5 on:** March 20, 2018, 11:11:32 PM »

What was the offset on the stock triple clamp? I did this mod on my Lemans 2 race bike and it was defineatly stable but it wouldn�t turn, it was like a chopper. I ended up jigging up the frame and cutting off the steering head and reducing the angle from 28 degrees to 24 degrees. Still stable on a rough track but it would turn. If your stock clamp was like mine it�s probably got a offset a lot larger the 30 mm. Stock trail is probably around 100 mm and if you measure it with the GSXR triples it will probably be about 130 or more. You can google how to measure trail online and with the photos it�s easier than me explaining how to do it. I will take a side shot of mine and post it tomorrow and if you compare it to yours it will look like a chopper! I did one race without raking it in and it was the worst bike I had ever rode. You can build new triple clamps with the same offset as the stock ones but it looks funny in my opinion which is why I raked in the steering head. Be forewarned that it�s not a easy job to do unless you are in a well equipped shop and have metal working skills.

harrytief · « **Reply #6 on:** March 21, 2018, 01:01:49 AM »

The stock guzzi offset is 65mm and the stock gsxr 600 that these came from is 30mm. The custom triples I use are 30mm offset. I've experimented with longer shocks and pulling the fork tubes up in the triples to alter steering angle and trail. I'll check my notes to be certain but IIRC, i'm at about 28degrees steering angle and trail of 120mm with these 30mm triples and the forks positioned as they are now. The bike handles WELL with it's only drawback being reduced turning circle. I had to alter the steering stops to keep the triples from hitting the tank. The front crash bars I added actually serve that purpose now.
Harry

pete roper · « **Reply #7 on:** March 21, 2018, 01:11:25 AM »

Showas I assume? Showas are a great fork! Must be about 1000 times better than the 40 year old original POS. Nice work.

Pete

rodekyll · « **Reply #8 on:** March 21, 2018, 04:25:42 AM »

What year gsxr?

Rough Edge racing · « **Reply #9 on:** March 21, 2018, 06:39:58 AM »

I have done a number of late model fork swaps on earlier bikes... Yoke offset does matter, more offset results in faster steering..As mentioned above there are ways around it... Most newer sport bikes seem to have about 24-25 degrees rake and 4.2 inches trail, short wheelbases and a 17 inch front wheel...

harrytief · « **Reply #10 on:** March 21, 2018, 10:12:56 AM »

Thanks Pete. that means a lot.
Yes, they are showa. I agree that they are a GREAT fork. For most riders, with fresh oil and proper setup, they are ohlins lite at a fraction the price.
Rodekyll. The set I used are from a 2006 gsxr600. Different years of gsxr600 as well as the gsxr1000 use different offsets and even different fork manufacturers. There are tables online that will help you choose if you know the variables to look for.

Oldrat · « **Reply #11 on:** March 21, 2018, 12:53:20 PM »

That looks like a top class job

I too have GSXR front forks but only the cartridges. Darren at MCT, a UK company with a top reputation for suspension work, managed to shoehorn Suzuki GSXR internals into my original GUZZI forks. I wanted an original classic look and so modern forks would have been well out of place. I had to anodise new fork adjusters to change bright blue to a more suitable black. The ride is superb.

http://www.mctsuspension.com/about.html

Stevex · « **Reply #12 on:** March 21, 2018, 02:19:15 PM »

Oldrat, I need to go down that route on my LM2; could you tell me which model fork internals you used and the cost please?

rodekyll · « **Reply #13 on:** March 21, 2018, 02:53:38 PM »

Quote from: harrytief on March 21, 2018, 10:12:56 AM

Thanks Pete. that means a lot.
Yes, they are showa. I agree that they are a GREAT fork. For most riders, with fresh oil and proper setup, they are ohlins lite at a fraction the price.
Rodekyll. The set I used are from a 2006 gsxr600. Different years of gsxr600 as well as the gsxr1000 use different offsets and even different fork manufacturers. There are tables online that will help you choose if you know the variables to look for.

While I'm interested and impressed by the conversion, my real reason for asking about the year of the gsxr is that you've got the same brake calipers on that front end as I put on the trike, and I didn't know what they came off of. I need the seal kit for one and Suzuki doesn't know what their parts look like. Without year and model they're helpless. So your project is solving problems you didn't even know about.

canuck750 · « **Reply #14 on:** March 21, 2018, 03:07:47 PM »

Nice work, looks great

Oldrat · « **Reply #15 on:** March 21, 2018, 05:20:35 PM »

Quote from: kirby1923 on March 21, 2018, 02:27:08 PM

Yes please.

I cant take the credit, Darren at MCT was the expert. ISTR that he used 2005/6 Suzuki GSXR 600 cartridges, same as or similar to the forks the OP used in his upgrade.
In terms of cost, including parts it was the wrong side of (ahem, er indoors might be around) the wrong side of 500 uk pounds

Its not cheap but the bike handles very well for an old girl and I am a very happy bunny.

I put a link to MCT on the first post, give them a call for a quote??

73eldorado · « **Reply #16 on:** March 21, 2018, 05:59:59 PM »

Here is some pictures of my Lemans 2 with a GSXR front end with yokes, the steering head was also raked in and braced. The rake is around 24 degrees, the reason I say about is because I did this roughly 15 years ago! Set up with approx 100 mm of trail it corners very well and with the forks more straight up and down they work better than raked out, less striction. I also have a 160 tire on the back with a single shock, corners like my GSXR 750 road racer and never drags anything in the corners.

Oldrat · « **Reply #17 on:** March 21, 2018, 06:03:43 PM »

Quote from: 73eldorado on March 21, 2018, 05:59:59 PM

Here is some pictures of my Lemans 2 with a GSXR front end with yokes, the steering head was also raked in and braced. The rake is around 24 degrees, the reason I say about is because I did this roughly 15 years ago! Set up with approx 100 mm of trail it corners very well and with the forks more straight up and down they work better than raked out, less striction. I also have a 160 tire on the back with a single shock, corners like my GSXR 750 road racer and never drags anything in the corners.

Now that sir is what we over here in the U.K. would call a ‘proper tool’. I’d love to hear it running ???

73eldorado · « **Reply #18 on:** March 21, 2018, 06:52:44 PM »

Quote from: Oldrat on March 21, 2018, 06:03:43 PM

Now that sir is what we over here in the U.K. would call a �proper tool�. I�d love to hear it running ???

I hate to admit it but I have owned the bike since 1987 and put close to 100000 km on it before I raced it. It�s been parked in my shed for 10 years or so gas drained etc, I want to turn it back into a street bike and will start that process this year. I am ashamed to have done this to a faithful motorcycle, but life got in the way. I will tell you a story about the exhaust sound though. I tried many different designs to get a system that made power without flat spots or dragged in the corners. Even made a under seat design like the Ducati 916 had but would not run right, big flat spot. On my 4th or 5th design I made a GP style 2 into 1 , ported the inside so everything was smooth and presto, it ran perfectly. I had a customer come over for repairs and he inquired about the Lemans and wanted to here it run so I got him to push start me as I did not want to set up the rollers to start it. On about the tenth try the high compression big cam motor flashed up, he was a tired boy! I put it by the shop and put the stand under the bike and left it running. He stood by the bike and just stared at it, I worked on his bike and watched him just stare for what seemed like 5 minutes. He was mezmorized by the sound. Kind of like a big block drag racer! Down the road I will post pictures of the transformation of the bike for street use and I will post a video of it running. It is my busy time of year and I will be buried under customers bikes for the next couple of months so the Lemans will have to wait even though seeing it in the daylight got me revved up!!

harrytief · « **Reply #19 on:** March 21, 2018, 09:10:21 PM »

I'm seeing two things emerge from this thread. Firstly, like many before, there will always be riders who see these tonti framed bikes as blank canvas on which something striking and satisfying will emerge regardless of the contemporary motorcycle enviornment. Secondly, a retro big block cafed and fitted up with modern suspension and tires from the factory might just find a market. I am a tinkerer and like to roll my own but when I saw the griso, I knew I would own one. Still, a new BB tonti lemans... :drool
As much as I love my griso, it will be the cx100 that goes into the living room when I can't ride any longer.
BTW
Oldrat, 73Eldo, lovely.
Harry

73eldorado · « **Reply #20 on:** March 21, 2018, 09:46:11 PM »

Quote from: harrytief on March 21, 2018, 09:10:21 PM

I'm seeing two things emerge from this thread. Firstly, like many before, there will always be riders who see these tonti framed bikes as blank canvas on which something striking and satisfying will emerge regardless of the contemporary motorcycle enviornment. Secondly, a retro big block cafed and fitted up with modern suspension and tires from the factory might just find a market. I am a tinkerer and like to roll my own but when I saw the griso, I knew I would own one. Still, a new BB tonti lemans... :drool
As much as I love my griso, it will be the cx100 that goes into the living room when I can't ride any longer.
BTW
Oldrat, 73Eldo, lovely.
Harry

Well said

smdl · « **Reply #21 on:** March 21, 2018, 11:44:36 PM »

Looks nice, and rides nicely, too! Well done, Harry!

Shaun

Chuck in Indiana · « **Reply #22 on:** March 22, 2018, 06:37:20 AM »

There's some nice work in this thread..

harrytief · « **Reply #23 on:** March 22, 2018, 09:14:48 AM »

Hey Shaun
Good to hear from you. How wonderful is life in paradise?
How is the 850t project?
Harry

smdl · « **Reply #24 on:** March 22, 2018, 10:17:08 AM »

Quote from: harrytief on March 22, 2018, 09:14:48 AM

Hey Shaun
Good to hear from you. How wonderful is life in paradise?
How is the 850t project?
Harry

Hi, Harry.

Life is good, thanks! Project is proceeding, albeit slowly. Now that I have the collector plate request in for the TR4A, I am doing a bunch of pre-season work on the Stelvio, and then will be back on the T. Well keep you posted.

Glad you're still enthralled with the CX. It's a beauty!

Cheers,
Shaun

shaggy · « **Reply #25 on:** March 22, 2018, 11:10:27 AM »

i too did that same up grade,u turns in the street wont happen. and be carefull when you hit the fork stops while turning, the bike wants to fall for some reason. I like that you used the stock 18 inch wheel,and the gsxr disk. Brad

groundhog105 · « **Reply #26 on:** March 22, 2018, 04:04:13 PM »

Quote from: 73eldorado on March 21, 2018, 05:59:59 PM

Here is some pictures of my Lemans 2 with a GSXR front end with yokes, the steering head was also raked in and braced. The rake is around 24 degrees, the reason I say about is because I did this roughly 15 years ago! Set up with approx 100 mm of trail it corners very well and with the forks more straight up and down they work better than raked out, less striction. I also have a 160 tire on the back with a single shock, corners like my GSXR 750 road racer and never drags anything in the corners.

I really like what you’ve done here. Beautiful and functional. I can’t wait so see it back in street trim.

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Author Topic: gsxr fork on cx100 hot rod (Read 5762 times)

pete roper

Rough Edge racing

canuck750