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Offline SOHC4 Cafe Racer Fan

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #350 on: July 29, 2014, 08:48:03 AM »
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #351 on: July 29, 2014, 08:59:36 AM »
Seth,

I imagine you will get an appreciable power gain going from the Ural 750 to the R100 motor - an approximate 160% increase according to factory specs at the crank (70 vs 44).

I haven't had much experience with BMW flatheads, other than riding my buddy's R50/5.  It takes some getting used to when you rev the motor and feel the gyroscopic effect pull the bike to one side.  I'm sure you will feel it more with the larger R100 motor.  If you don't mind, post some pics of the BMW/Ural build as it progresses.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

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2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SOHC4 Cafe Racer Fan

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #352 on: July 29, 2014, 10:25:53 AM »
Quote from: calj737 on July 29, 2014, 10:10:57 AM
That gyro is mostly due to the output shaft being on the right side, tied to the right-sided final drive. Also, the cylinders are offset front-to-rear increasing this gyro. Like righthanded rifling in a pistol actually. That is why many of their bikes came with dampers I'm told. Deceleration and the gyro, hmmm, interesting steering effects.  :)

I wonder if the two-wheel drive of the side car combined with the weight of the side car balances that gyro effect. 
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1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Terry in Australia

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #353 on: July 30, 2014, 12:25:33 AM »
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

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Offline Terry in Australia

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #354 on: July 30, 2014, 12:29:45 AM »
Quote from: CB750 Cafe Racer Fan on July 29, 2014, 08:07:54 AM
Hahahaha. You know, it's not the size of the dog in the fight ...

Well that's true, but I wouldn't put it up against a pit bull to test the theory............. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Terry in Australia

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #355 on: July 30, 2014, 12:35:27 AM »
Quote from: CB750 Cafe Racer Fan on July 29, 2014, 08:59:36 AM
Seth,

I imagine you will get an appreciable power gain going from the Ural 750 to the R100 motor - an approximate 160% increase according to factory specs at the crank (70 vs 44).


And that's with a stock R100 engine, you can buy some excellent engine hot up gear from Europe that will double that figure for not a great deal of money. I thought about doing it to my second R100RS, but decided that it was easier to sell it and buy my K100RS, which is way quicker, and easier to live with. If I had a Urinal though, I'd do just what Seth is gonna do, and I'd work that engine over to within an inch of it's life.......... ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline sethdhawkins

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The Quest for Brakes and Suspension: GSX-R Treats
« Reply #356 on: July 31, 2014, 09:28:03 AM »
It's a '96 Tourist, so the original motor was a 650cc! Yeah, I'm hoping the driveline will be able to handle it. I'm told that as long as I still respect it as a ural, I should be good to go.

Motor before cleanup.

Shiny ;)


I'll get to the barrels with the bead blaster when I go into the top end(s). I think I may start a project thread over on DTT for this...not sure how much interest there will be. I'm looking to still have this thing as an outside only rig, so cosmetics won't be as tight as previous builds. I'm mulling over paint ideas, and a general theme.
« Last Edit: July 31, 2014, 09:32:10 AM by sethdhawkins »
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

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Offline SOHC4 Cafe Racer Fan

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #357 on: July 31, 2014, 11:25:31 AM »
Please continue posting up some progress photos on this thread, if you don't mind.
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2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline Terry in Australia

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #358 on: July 31, 2014, 09:40:37 PM »
Yeah, post about it here Seth, I don't like those DTT Wankers........ ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Syscrush

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #359 on: August 04, 2014, 07:34:51 AM »
Quote from: sethdhawkins on June 18, 2014, 06:08:57 AM


Not really great iphone photos, but I wanted to give you guys something before I went back to work. Honestly, I've pretty much just been riding the ural for the last three weeks ;) With the clip ons and the pull on the Mikuni's, the bike is pretty tiresome on the hands and forearms.
The best training for that is to ride more, not less!  This is a beautiful bike, you did a great job on it.
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Life is precious: wear your f'n helmet!
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FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #360 on: August 04, 2014, 09:27:09 AM »
I wonder if the springs on the Mikunis can be modified or replaced with lower tension springs so it's not as much of a work out.  It would be a shame to have to swap out the RS34s, but you could always go to CRs.  Hey, it's only money, right?
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #361 on: August 04, 2014, 09:42:27 AM »
I tried lower tension on the springs (you can unwind one of the springs), but alas, with the flatslides and the vacuum created by the engine, the slides will stick partially open on return.
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #362 on: August 04, 2014, 09:45:58 AM »
Quote from: sethdhawkins on August 04, 2014, 09:42:27 AM
I tried lower tension on the springs (you can unwind one of the springs), but alas, with the flatslides and the vacuum created by the engine, the slides will stick partially open on return.

That sucks.  I had no idea the RS34s had what appears to be an inherent design issue.  I will be rethinking carbs for my second 750.  Maybe I'll do CR29s again.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #363 on: August 04, 2014, 09:57:17 AM »
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

1972-ish CB750K
1974 CB450
1974 CB360
1976 136' Ocean Going Tug

Offline bjbuchanan

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #364 on: August 04, 2014, 06:43:32 PM »
Quote from: sethdhawkins on August 04, 2014, 09:57:17 AM
Be a pioneer!
http://www.dynoman.net/carb/keiFCR.html

I don't know much about your current carbs but I have a thought. Have you considered changing the leverage ratios, like increasing the size of the bell crank or at the handlebar grip with a different throttle tube?

I have seen where someone put fishing line around the nylon throttle tube to build up the diameter of the sleeve. That is a quick, cheap tweak to see if it begins to help at all
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Offline Terry in Australia

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #365 on: August 05, 2014, 01:51:34 AM »
Quote from: sethdhawkins on August 04, 2014, 09:42:27 AM
I tried lower tension on the springs (you can unwind one of the springs), but alas, with the flatslides and the vacuum created by the engine, the slides will stick partially open on return.

I've got a set of "as new" CR31's that I'd trade you for your Mikuni's Seth, if you're interested? Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #366 on: August 05, 2014, 03:10:26 AM »

Quote from: Terry in Australia on August 05, 2014, 01:51:34 AM
Quote from: sethdhawkins on August 04, 2014, 09:42:27 AM
I tried lower tension on the springs (you can unwind one of the springs), but alas, with the flatslides and the vacuum created by the engine, the slides will stick partially open on return.

I've got a set of "as new" CR31's that I'd trade you for your Mikuni's Seth, if you're interested? Cheers, Terry. ;D

And I've got a pouch full of magic beans for trade ;)
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

1972-ish CB750K
1974 CB450
1974 CB360
1976 136' Ocean Going Tug

Offline Retro Rocket

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #367 on: August 05, 2014, 05:05:38 AM »
Quote from: sethdhawkins on August 05, 2014, 03:10:26 AM

Quote from: Terry in Australia on August 05, 2014, 01:51:34 AM
Quote from: sethdhawkins on August 04, 2014, 09:42:27 AM
I tried lower tension on the springs (you can unwind one of the springs), but alas, with the flatslides and the vacuum created by the engine, the slides will stick partially open on return.

I've got a set of "as new" CR31's that I'd trade you for your Mikuni's Seth, if you're interested? Cheers, Terry. ;D

And I've got a pouch full of magic beans for trade ;)

OOH OOH, I've got a bridge, wanna trade.... ;D ;)
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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #368 on: August 05, 2014, 10:20:14 AM »
Quote from: bjbuchanan on August 04, 2014, 06:43:32 PM
Quote from: sethdhawkins on August 04, 2014, 09:57:17 AM
Be a pioneer!
http://www.dynoman.net/carb/keiFCR.html

I don't know much about your current carbs but I have a thought. Have you considered changing the leverage ratios, like increasing the size of the bell crank or at the handlebar grip with a different throttle tube?

I have seen where someone put fishing line around the nylon throttle tube to build up the diameter of the sleeve. That is a quick, cheap tweak to see if it begins to help at all

BJ,

FYI - Seth has a Motion Pro adjustable throttle, so I would imagine he has already tried the different throttle diameters as a "fix."
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #369 on: August 05, 2014, 10:56:51 AM »

[/quote]

BJ,

FYI - Seth has a Motion Pro adjustable throttle, so I would imagine he has already tried the different throttle diameters as a "fix."
[/quote]

Yup.
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

1972-ish CB750K
1974 CB450
1974 CB360
1976 136' Ocean Going Tug

Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #370 on: August 05, 2014, 10:56:57 AM »

[/quote]

BJ,

FYI - Seth has a Motion Pro adjustable throttle, so I would imagine he has already tried the different throttle diameters as a "fix."
[/quote]

Yup.
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

1972-ish CB750K
1974 CB450
1974 CB360
1976 136' Ocean Going Tug

Offline Retro Rocket

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #371 on: August 05, 2014, 02:48:23 PM »
Seth, Mike Reick is the one to talk to, he runs these carbs and has done for some time, he's on holidays at the moment, I would definitely be talking to someone that knows these carbs well, they are used for racing and a heavy throttle is detrimental to throttle response..
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Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #372 on: August 05, 2014, 04:21:25 PM »
Mick,

I spoke with Mike last year, actually. The carbs are dialed in, and damn near perfect. Bike runs like a monster. My single, and only fault on these carbs is the pull. I believe it's just the nature of the beast. If you google the RS's (34, 36, 38, 40's) throughout their applications (early gixxer, retro'd onto KZ's, etc.), you'll see the same complaints. I think the ticket is the flatslides with the roller bearings...buttery smooth (I'm hoping Don will take the financial plunge and get some racked). Others complain that the carbs are difficult around town, but I find them very easy, and they idle well.

Seth
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Offline Retro Rocket

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #373 on: August 05, 2014, 04:26:45 PM »
I wonder how different they are to the early GSXR1100 carbs, they were flatslides and smooth and light....?  I love light throttles and want to use a set of these, let us know if you find a solution, I think the bigger cam on the linkage is the way to go... ;)
« Last Edit: August 05, 2014, 08:16:20 PM by Retro Rocket »
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline sethdhawkins

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Re: The Quest for Brakes and Suspension: GSX-R Treats
« Reply #374 on: August 05, 2014, 04:29:38 PM »
I also prefer the light throttle. I'm at the second smallest cam in my package of four. Any larger, and it would make a 1/4 turn throttle feel stock.
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All a man needs in this world is someone to love, if you can't give him that, give him hope, if you can't give him hope...just give him something to do!

1972-ish CB750K
1974 CB450
1974 CB360
1976 136' Ocean Going Tug
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