« previous next »
Pages: 1 2 [3]   Go Down

Author Topic: This is my first CB750F  (Read 14754 times)

0 Members and 1 Guest are viewing this topic.

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #50 on: March 09, 2018, 06:15:25 PM »
Only some tinkering left to do.

Sent from my SM-G930W8 using Tapatalk

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,915
Re: This is my first CB750F
« Reply #51 on: March 10, 2018, 11:15:47 AM »
Looks cool...how's it ride?
Logged
If it works good, it looks good...

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #52 on: March 10, 2018, 04:29:35 PM »
Quote from: seanbarney41 on March 10, 2018, 11:15:47 AM
Looks cool...how's it ride?
Thx. It's a beast. I only have 10 minutes on it so far.
I need to figure out the jetting. I put in bigger pilots, and 4 steps up on the mains but it still hangs high and doesn't want to idle down right away. Sounds lean so I think I'll try raising the needles. Make sense? Also 2 carbs seem to have sticking float valves because they overflow...
Comments welcomed.

Sent from my SM-G930W8 using Tapatalk

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,915
Re: This is my first CB750F
« Reply #53 on: March 10, 2018, 07:40:55 PM »
A pipe that short wants a lot of gas...I learned from my hand bent Yoshimura...plus you got pods.  I would suggest an inner fender of some sort so the back wheel doesn't fling crap all over that neat oil tank and the engine.  All it would take is some alloy sheet tie wrapped in there to look good too...looks unfinished to me without something
Logged
If it works good, it looks good...

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #54 on: March 11, 2018, 10:37:22 AM »
Quote from: seanbarney41 on March 10, 2018, 07:40:55 PM
A pipe that short wants a lot of gas...I learned from my hand bent Yoshimura...plus you got pods.  I would suggest an inner fender of some sort so the back wheel doesn't fling crap all over that neat oil tank and the engine.  All it would take is some alloy sheet tie wrapped in there to look good too...looks unfinished to me without something
Originally I didn't think I needed an inner fender but you are right, it definitely could use one.  Plus it's amazing how much crap flicks up from the clean roads!  That's on my list now.
I did powder coat a few last items.  Any suggestions on how to secure the wires for the speed sensor pickup which I mounted near the rear hub?  It needs to attach to the swingarm somehow.

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #55 on: March 11, 2018, 08:57:32 PM »
Quote from: calj737 on March 11, 2018, 05:00:32 PM
Quote from: Johnny340 on March 11, 2018, 10:37:22 AM
Any suggestions on how to secure the wires for the speed sensor pickup which I mounted near the rear hub?
Yeah, move it. Install it under the front sprocket cover, with the magnet being one of the front sprocket bolts (you can find 6mm Magnetic bolts for this exact install). The sensor then is installed within a small tab of sheet metal (you fabricate) that is positioned opposite the sprocket bolt. All this is neatly tucked under the cover, the sensor wires run with the stator/oil/neutral wires up to the gauge. Clean, neat, out of sight. And dead nuts accurate.
Isn't that a genius idea?! Where were you when I was making the rear bracket...  I'll do that. So to set the correct 'wheel size' based on the counter sprocket size is it simple math: 48/(counter sprocket teeth) * 1884   Yes?

Sent from my SM-G930W8 using Tapatalk

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #56 on: March 11, 2018, 09:07:29 PM »
Quote from: calj737 on March 11, 2018, 09:02:34 PM
Nope, continue to use the rear wheel diameter. You may need to slightly adjust the gauge’s calculations if you can pace your bike with an auto using Cruise Control. I did mine from 30, 40, 50 and 60. I think I. Needed a 10mm change (if I recall correctly the adjustment measurement).
Oh ok I was thinking that it would be going around roughly 3 times as fast. Yes pacing would be the most accurate. I like that clean install idea!
So how do I get the Motoscope to read the oil temp? I see T1 for air or water temp but no oil temp setting..
Thx

Sent from my SM-G930W8 using Tapatalk

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #57 on: March 12, 2018, 07:43:44 AM »
Quote from: calj737 on March 12, 2018, 05:32:02 AM
Well, you have a MotoScope Classic if your pictures aren't lying. Oil Temp requires use of their Temperature Sensor (https://motogadget.com/shop/en/checkout/cart/)

The Oil Temp sensor wires to WHT/BLK of the gauge.
From the manual: "11.3.8 Temperature Display T2, Oil Temperature (oil)
This value shows the current oil temperature as soon as it is inside the measuring range of the sensor. The definition of limits is equivalent to the one described for T1." Page 12
Yes I meant to write Motoscope classic! Ok I am connected to that white wire and I have that one wire sensor in the link. The oil pressure red light doesn't work either.. Assuming the stock Honda sender works for that, I'm thinking I haven't set up the limit ranges for these and that's required??

Sent from my SM-G930W8 using Tapatalk

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #58 on: March 12, 2018, 04:03:46 PM »
Quote from: calj737 on March 12, 2018, 10:15:31 AM
WHT/BLK wire for Temp, right?

The stock OIL pressure switch is BLU/RED and wires to gauge WHITE. This is the "pressure" input on the gauge. You won't need the OIL warning light range. The switch opens and closes based upon pressure, interrupting the signal. If you want pressure range, you'll need to use the MotoG pressure switch.

Yes WHT/BLK for the Oil temperature input. :o I need to proofread before sending...
I connected the Honda Oil Pressure switch to the WHT. (I also have a direct mechanical pressure gauge.)
So once I set the limits in both the Temp and Oil pressure both indications worked perfect.   Thanks Cal!

I also have a sticky neutral switch too. (oh those 40 year old parts...)  If I remove the locking tab and pull the entire brass unit out without draining the oil, will it look like the Exxon Valdez in my garage?
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #59 on: March 12, 2018, 07:45:02 PM »
Carbs synced.
Lowered needle clips. Running really good now. Especially after cleaning the tank...Again.

Sent from my SM-G930W8 using Tapatalk

Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: This is my first CB750F
« Reply #60 on: March 13, 2018, 08:19:44 AM »
Quote from: calj737 on March 13, 2018, 04:32:34 AM
Johnny - Is your tank bare metal inside? If so, you might try this product Master Series Silver. Another member, Pete was so damn adamant about it, I gave it a go. Its a moisture cured "primer" that you dump in, tumble once or twice, pour out. Let stand for 2-3 days, voila, done. Ethanol and gas resistant, and super thin, and no other chemicals. I'm impressed with it.

Hey, Cal.  Are you referring to the Primer/Sealer Silver product: https://shop.masterseriesct.com/product.sc;jsessionid=E94EE496B956F91F16821D32D396CC33.p3plqscsfapp006?productId=6&categoryId=1 ?
It looks like a pint would be sufficient for a gas tank.  Probably a lot thinner coat than Caswell epoxy. 
Logged
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 Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #61 on: March 13, 2018, 10:55:05 AM »
Quote from: calj737 on March 13, 2018, 04:32:34 AM
Johnny - Is your tank bare metal inside? If so, you might try this product Master Series Silver. Another member, Pete was so damn adamant about it, I gave it a go. Its a moisture cured "primer" that you dump in, tumble once or twice, pour out. Let stand for 2-3 days, voila, done. Ethanol and gas resistant, and super thin, and no other chemicals. I'm impressed with it.

Yes the tank is bare inside.  It looked really good so I used Metal Rescue in case there was any surface rust I couldn't see and I rinsed it out, then sprayed Dry Coat. I don't know if something happened while it got dipped at the hydro graphic place but there were black flecks in it.  It is clean again and I have an inline filter as well.  I may try that stuff in the link.
I'd like to get it running perfect if possible now that the black flecks are taken care of.  I thought that raising the needles was going to do it but it still hangs before idling down.  The air screws have some affect on this (1/2T out is better than 1& 1/2T out).  I have one size up on the Pilots already at 45.  It's almost behaving like there is an air leak..  Any thoughts? 
CX3 cam with 251 duration should idle without hanging, eh?
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: This is my first CB750F
« Reply #62 on: March 13, 2018, 12:38:04 PM »
Quote from: calj737 on March 13, 2018, 12:23:40 PM
Quote from: SOHC4 Cafe Racer Fan on March 13, 2018, 08:19:44 AM
Quote from: calj737 on March 13, 2018, 04:32:34 AM
Johnny - Is your tank bare metal inside? If so, you might try this product Master Series Silver. Another member, Pete was so damn adamant about it, I gave it a go. Its a moisture cured "primer" that you dump in, tumble once or twice, pour out. Let stand for 2-3 days, voila, done. Ethanol and gas resistant, and super thin, and no other chemicals. I'm impressed with it.

Hey, Cal.  Are you referring to the Primer/Sealer Silver product: https://shop.masterseriesct.com/product.sc;jsessionid=E94EE496B956F91F16821D32D396CC33.p3plqscsfapp006?productId=6&categoryId=1 ?
It looks like a pint would be sufficient for a gas tank.  Probably a lot thinner coat than Caswell epoxy.
Yep. And it is thiner and more workable than Caswell. Jury is still out on durability, but I've used it on some stuff in the shop I fab'ed up from steel and so far is working out well. Applied it with a foam brush on those steel surfaces.

Good to know.  Fortunately, my next tank is aluminum so I should not need to coat it.
Logged
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 Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #63 on: March 13, 2018, 03:56:47 PM »
Fixed the neutral switch.  :)

Runs best with Air Screws at only 1/4 turn out which leads me to believe the Pilots are still too small.  It idles great there but still has a hang up at 2300RPM for a couple seconds before idling down.  Any suggestions? Thx.

Another pic.
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #64 on: October 02, 2018, 12:08:20 PM »
Fixed Idle and it runs perfect now! New Fox shocks.  Finished!  Super fun to ride!!


Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #65 on: October 02, 2018, 12:26:41 PM »
More pics
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,050
Re: This is my first CB750F
« Reply #66 on: October 02, 2018, 01:38:19 PM »
 Great looking bike  look me up if you get up this way..
 One thing I would do if it's were mine,
 I would make headlight bracket lo get and curl the front down to at least midpoint of damper. If you did not use countersunk Allen head to mount light block, that can get it lower.
 Or just paint the damper black, make it blend in, right now it stands out.l
 Enjoy the bike.,
Logged
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #67 on: October 04, 2018, 08:24:46 PM »
Thanks a lot Frank!  You bet I will when I'm in town.
I know what  you mean about the steering dampener.  I have the headlight as low as possible and it just barely clears the dampener as it is.  I tried it lower but it would have had to stick out front too far to clear it..  You're right, I'll paint the dampener black so it doesn't stand out and that should improve the look of the front end.

It's super fun to ride, but Summer ended too fast!
« Last Edit: October 04, 2018, 08:26:52 PM by Johnny340 »
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #68 on: October 17, 2018, 09:07:10 AM »
I just wanted to say a big THANK YOU too all of the forum members who helped me out!  I would never have been this happy with it without all of the help.  What a great forum!  You know who you are but these ones pop into my head: 754, Calj737, Flybox1, Bodi, Hondaman, Scottly, TwoTired, PeWe, godffery, Mystic1. Thank you to you and all the others who helped or even just offered an opinion along the way.
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250

Offline diep

  • Full Member
  • *
  • Posts: 1
Re: This is my first CB750F
« Reply #69 on: December 09, 2018, 08:15:40 PM »
love the work you did on your bike, its beautiful. where did you get the seat and seat pan?
Logged

Offline Johnny340

  • Hot Shot
  • ***
  • Posts: 431
Re: This is my first CB750F
« Reply #70 on: December 09, 2018, 09:39:38 PM »
Quote from: diep on December 09, 2018, 08:15:40 PM
love the work you did on your bike, its beautiful. where did you get the seat and seat pan?

Thanks for your comments!  I had the seat custom made from a friend in the upholstery business and the seat pan came from here:
https://www.dimecitycycles.com/legendary-motorcycles-fiberglass-thruxton-cafe-racer-motorcycle-seat-pan.html
Logged
1975 CB750F0 Super Sport
1972 CB750K2
1981 CB650
1974 T-500
2003 GSXR750
2006 YZ250
Pages: 1 2 [3]   Go Up
« previous next »