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Author Topic: 76 Supersport  (Read 17384 times)

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Offline Badluckhonda

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Re: 76 Supersport
« Reply #75 on: May 25, 2015, 11:26:36 AM »
What kind of rotor is that you have on the engine ?
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Offline frodef2

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Re: 76 Supersport
« Reply #76 on: May 25, 2015, 11:32:47 AM »
Its an alternator upgrade kit made and sold by Anders288 on this forum.
32 amps and quite a bit lighter.


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76' Supersport

Offline Badluckhonda

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Re: 76 Supersport
« Reply #77 on: May 25, 2015, 02:10:00 PM »
That's pretty awesome. Did you weigh the differnce ? Is it balanced ?
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Offline Badluckhonda

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Re: 76 Supersport
« Reply #78 on: May 25, 2015, 02:10:33 PM »
It looks amazing
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Offline Retro Rocket

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Re: 76 Supersport
« Reply #79 on: May 25, 2015, 02:52:01 PM »
Very nice... ;)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
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Offline frodef2

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76 Supersport
« Reply #80 on: June 01, 2015, 12:58:10 PM »
Today i re checked my cam timing.

Initially i made the adjustments with an homemade degreewheel. And i wanted to recheck it when my APE wheel arrived.

It was good that i did the recheck. I had managed to missread the valve closing value by 5 degrees.



The brass adapter i made for my cd-rom degree wheel also fit the APE wheel.



The next thing i did was to modify a Moto GPwerks  swingarm to make it fit my f1. When i bought the thing off evbay i only read cb750f. I was so happy to find a swingarm i did not see that it was for a DOHC.

So today i pulled the needle bearings. Cut off 3mm on each side, and made 2 bronze bushings to fit the SOHC axle. Then i filed the last 1 mm off each side to make sure it was straight.







The damper angle is less than ideal. But i will have to live with it.

Frode j


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« Last Edit: June 01, 2015, 12:59:57 PM by FrodeF2 »
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76' Supersport

Offline SOHC4 Cafe Racer Fan

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Re: 76 Supersport
« Reply #81 on: June 01, 2015, 02:05:13 PM »
Nice work adapting (milling) the DOHC swingarm to fit.  I love this build.  The motor is going to make some power.
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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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2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline Badluckhonda

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Re: 76 Supersport
« Reply #82 on: June 01, 2015, 07:39:37 PM »
How much longer is that swingarm ? Looks awesome
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Offline greenjeans

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Re: 76 Supersport
« Reply #83 on: June 02, 2015, 08:21:09 AM »
Lots of things to love on this one.   Super nice motor & parts upgrades.   Of all the modern fork upgrades we see here, this is among the first that I can remember that uses 18" & 19" wheels.   To me, those sizes look the best and certainly most appropriate & timeless.   I feel the need to mention the shortened seat pan again - love it.  Have you figured out what to do with the offset of your triples yet ?   Devin at CognitoMoto can make triples with the stock offset - he's a member here.   I also have one of those MotoGP swingarms & exhausts on my 750.  He makes some nice stuff and that swing arm made a noticeable difference on mine.  Stiff might not be strong enough.  I am contemplating the M-unit stuff for mine and can't wait to see how you end up wiring things.

Great build.  Keep it going.
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Offline SOHC4 Cafe Racer Fan

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Re: 76 Supersport
« Reply #84 on: June 02, 2015, 09:01:49 AM »
Quote from: greenjeans on June 02, 2015, 08:21:09 AM
Lots of things to love on this one.   Super nice motor & parts upgrades.   Of all the modern fork upgrades we see here, this is among the first that I can remember that uses 18" & 19" wheels.   To me, those sizes look the best and certainly most appropriate & timeless.   I feel the need to mention the shortened seat pan again - love it.  Have you figured out what to do with the offset of your triples yet ?   Devin at CognitoMoto can make triples with the stock offset - he's a member here.   I also have one of those MotoGP swingarms & exhausts on my 750.  He makes some nice stuff and that swing arm made a noticeable difference on mine.  Stiff might not be strong enough.  I am contemplating the M-unit stuff for mine and can't wait to see how you end up wiring things.

Great build.  Keep it going.

+1 on Devin at Cognitomoto. As a recall, you have a Duc front end. You can send Devin your existing triples and he can make you a set with increased offset (restore it to stock geometry).  I just got my custom trees for my CBR600RR front end and they look amazing.
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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 frodef2

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Re: 76 Supersport
« Reply #85 on: June 02, 2015, 09:08:10 AM »
It is actually not the offset that is the problem, its that i am using a 19" wheel. Under heavy braking, the wheel would hit the bottom triple. I have already managed to almost bottom them outwhen they where mounted on my Ducati.  The springs in this fork is made for 5'2" italians barely pushing 120" pounds. And the bike they came from has a dry Weight of 179kg.

I will have to use either a 17" wheel or get longer fork legs.


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76' Supersport

Offline calj737

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Re: 76 Supersport
« Reply #86 on: June 02, 2015, 09:45:16 AM »
or stronger single rate springs...
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Offline SOHC4 Cafe Racer Fan

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Re: 76 Supersport
« Reply #87 on: June 02, 2015, 12:17:17 PM »
The smaller offset may still cause issues with reduced trail.  Retro Rocket can chime in, but you should look at how the modern front end affects the bike's steering and stability.  You can also just step down to an 18" front and respring your fork as necessary.

I am really looking forward to seeing this bike come together.  The JMR engine and all of the trick bits has me hooked.
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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 Badluckhonda

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Re: 76 Supersport
« Reply #88 on: June 02, 2015, 12:40:23 PM »
Smaller offset = more trail
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Offline MRieck

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Re: 76 Supersport
« Reply #89 on: June 02, 2015, 02:22:40 PM »
Quote from: Badluckhonda on May 25, 2015, 11:26:36 AM
What kind of rotor is that you have on the engine ?
It is from a Yamaha R6. It works great as there are a few of us in New England that have been running them.
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Offline SOHC4 Cafe Racer Fan

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Re: 76 Supersport
« Reply #90 on: June 02, 2015, 02:26:34 PM »
Quote from: MRieck on June 02, 2015, 02:22:40 PM
Quote from: Badluckhonda on May 25, 2015, 11:26:36 AM
What kind of rotor is that you have on the engine ?
It is from a Yamaha R6. It works great as there are a few of us in New England that have been running them.

Mike,

Are you referring to the Anders set up?

Don
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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 MRieck

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Re: 76 Supersport
« Reply #91 on: June 02, 2015, 02:38:09 PM »
Quote from: CB750 Cafe Racer Fan on June 02, 2015, 02:26:34 PM
Quote from: MRieck on June 02, 2015, 02:22:40 PM
Quote from: Badluckhonda on May 25, 2015, 11:26:36 AM
What kind of rotor is that you have on the engine ?
It is from a Yamaha R6. It works great as there are a few of us in New England that have been running them.

Mike,

Are you referring to the Anders set up?

Don
Yes Don
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Offline SOHC4 Cafe Racer Fan

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Re: 76 Supersport
« Reply #92 on: June 02, 2015, 02:58:18 PM »
Time for some "stupid" questions.  Please indulge me.  Since the Anders / R6 rotor is lighter, I would imagine that there is less flywheel effect. 
Does this system rev faster AND higher?
How fast can you rev the motor (what does this increase the redline to)? 
Do you lose any torque in the rev range?
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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 Retro Rocket

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Re: 76 Supersport
« Reply #93 on: June 02, 2015, 04:28:35 PM »
Quote from: Badluckhonda on June 02, 2015, 12:40:23 PM
Smaller offset = more trail

Correct... ;)
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If You can't fix it with a hammer, You've got an electrical problem.

Offline SOHC4 Cafe Racer Fan

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Re: 76 Supersport
« Reply #94 on: June 02, 2015, 04:30:11 PM »
Quote from: Retro Rocket on June 02, 2015, 04:28:35 PM
Quote from: Badluckhonda on June 02, 2015, 12:40:23 PM
Smaller offset = more trail

Correct... ;)

Yep.  I had a polarity shift for a second.
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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 Badluckhonda

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Re: 76 Supersport
« Reply #95 on: June 02, 2015, 06:15:04 PM »
I think with the offset your getting from that cbr1000 front end I would definitely go 18in wheel or 17. That 19 and current offset is gonna give you a slow responding front end
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Offline Badluckhonda

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Re: 76 Supersport
« Reply #96 on: June 02, 2015, 06:17:12 PM »
Quote from: MRieck on June 02, 2015, 02:22:40 PM
Quote from: Badluckhonda on May 25, 2015, 11:26:36 AM
What kind of rotor is that you have on the engine ?
It is from a Yamaha R6. It works great as there are a few of us in New England that have been running them.

Do use the stock keyway ? And can you run no battery ?
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Offline Retro Rocket

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Re: 76 Supersport
« Reply #97 on: June 02, 2015, 06:18:07 PM »
Quote from: Badluckhonda on June 02, 2015, 06:15:04 PM
I think with the offset your getting from that cbr1000 front end I would definitely go 18in wheel or 17. That 19 and current offset is gonna give you a slow responding front end

Springs suiting the new weight the front end has to cope with would help as well.... ;)
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If You can't fix it with a hammer, You've got an electrical problem.

Offline MRieck

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Re: 76 Supersport
« Reply #98 on: June 04, 2015, 04:32:32 AM »
Quote from: CB750 Cafe Racer Fan on June 02, 2015, 02:58:18 PM
Time for some "stupid" questions.  Please indulge me.  Since the Anders / R6 rotor is lighter, I would imagine that there is less flywheel effect. 
Does this system rev faster AND higher?
How fast can you rev the motor (what does this increase the redline to)? 
Do you lose any torque in the rev range?
It will rev quicker secondary to less weight. It will not allow for more "safe"revs but it has to be easier on the crank snout because of the lighter weight. Much better starter gear engagemnet. Torque is good though my engine is 1000cc
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Offline MRieck

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Re: 76 Supersport
« Reply #99 on: June 04, 2015, 04:37:02 AM »
Quote from: Badluckhonda on June 02, 2015, 06:17:12 PM
Quote from: MRieck on June 02, 2015, 02:22:40 PM
Quote from: Badluckhonda on May 25, 2015, 11:26:36 AM
What kind of rotor is that you have on the engine ?
It is from a Yamaha R6. It works great as there are a few of us in New England that have been running them.

Do use the stock keyway ? And can you run no battery ?
No keyway...Anders supplies an adaptor for a friction fit on the crank snout (just like stock). I would think you need a power source to start the bike ( even kick starting) so you would need some type of battery (it is not like a magneto)
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