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Author Topic: 1974 CB350F - First Restoration  (Read 24442 times)

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Offline HondanutRider

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Re: 1974 CB350F - First Restoration
« Reply #125 on: May 29, 2014, 09:28:32 AM »
Quote from: mark9331 on May 29, 2014, 08:45:44 AM
Question on carburetor slide gap. I gapped them by using wd40 straw for spacing. Should I have left more of a gap?

The amount doesn't matter, just that they are all the same and a slight opening is left.  That gap determines how much mixture is allowed through the carb when no throttle is applied.  It then would be adjusted during the synchronization procedure so that each cylinder draws and works the same.  The synchronization would also set the base idle speed which is also governed by the choke (should increase it when applied) and also the idle stop (which advances the speed by turning the whole rack mechanism at the idle stop).  When doing a synchronization, the choke advance should be off as also should be the idle stop.  You might want to set the idle stop slightly on when doing a synchronization, so that the idle speed could be lowered some more after the synch.
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Offline jamesv220820

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Re: 1974 CB350F - First Restoration
« Reply #126 on: May 29, 2014, 10:21:58 AM »
looking good so far!  Hey if you find yourself in the garage can you do a couple measurement for me? ( since my bike is in boxes)

Can you measure the distance from the top of the headlight bucket to the the gauges, where they hit?

And Also the front of the headlight to the gauges. 

I ask because I was thinking about getting this little headlight shield and getting it painted the bikes color.

I need to see if the guages will clear it or if I need to get a small coupler nut to life the gauges ever so slightly.  thanks

-cheers

-james


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There is nothing to fear but fear itself . . . and trying to restore a cb350f

Offline flybox1

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Re: 1974 CB350F - First Restoration
« Reply #127 on: May 29, 2014, 11:04:52 AM »
Quote from: mark9331 on May 29, 2014, 08:45:44 AM
Question on carburetor slide gap. I gapped them by using wd40 straw for spacing. Should I have left more of a gap?
You really can use anything to set the gap, but just verify your slides completely close when turning your idle set screw OUT and its tip loses contact with its tang....
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline mark9331

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Re: 1974 CB350F - First Restoration
« Reply #128 on: May 29, 2014, 04:13:19 PM »
So I think something in the carb is not perfectly clean.  It does not want to idle and when I open the throttle at low idle it simply dies.  So I think it could be a problem with something not being clean since it appears that it is able to run off the gas from the choke and not really getting any gas when I open the throttle or close the choke.  Suggestions on what I should be looking at or cleaning?  I am going to have to tear the stupid carbs off again... Oh well I am getting really good at this!  It is just a pain to get them back on with the air box....
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Offline mark9331

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Re: 1974 CB350F - First Restoration
« Reply #129 on: May 29, 2014, 04:14:30 PM »
Quote from: jamesv220820 on May 29, 2014, 10:21:58 AM
looking good so far!  Hey if you find yourself in the garage can you do a couple measurement for me? ( since my bike is in boxes)

Can you measure the distance from the top of the headlight bucket to the the gauges, where they hit?

And Also the front of the headlight to the gauges. 

I ask because I was thinking about getting this little headlight shield and getting it painted the bikes color.

I need to see if the guages will clear it or if I need to get a small coupler nut to life the gauges ever so slightly.  thanks

-cheers

-james

I will when I go down a little later.  That guard would look nice painted!
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Offline mark9331

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Re: 1974 CB350F - First Restoration
« Reply #130 on: May 29, 2014, 04:15:59 PM »
Started watching Long Way Round and I am absolutely convinced I need a BMW now!  Maybe in a couple years.
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Offline jamesv220820

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Re: 1974 CB350F - First Restoration
« Reply #131 on: May 29, 2014, 08:00:01 PM »
thanks mark
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Offline calj737

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Re: 1974 CB350F - First Restoration
« Reply #132 on: May 29, 2014, 08:11:12 PM »
Quote from: mark9331 on May 29, 2014, 04:15:59 PM
Started watching Long Way Round and I am absolutely convinced I need a BMW now!  Maybe in a couple years.

I could have told you that! SOHC bikes are great. But BMW bikes are amazing. It would be a very complement to your 350

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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

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Re: 1974 CB350F - First Restoration
« Reply #133 on: May 29, 2014, 08:43:01 PM »
I'm feeling the need for a new BMW S1000R naked bike!
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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 calj737

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Re: 1974 CB350F - First Restoration
« Reply #134 on: May 29, 2014, 08:48:20 PM »
Admit it, you just feel the need to be naked, Don.

I spent the day Tuesday with my brother who was out from Riverside at the dealership. Still have a woody over the '14 K1300s. Putting some of my older bikes up for sale to squirrel away some dough for that dude- I just hope that fund doesn't get eaten up with the R90 project  :-\
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline SOHC4 Cafe Racer Fan

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Re: 1974 CB350F - First Restoration
« Reply #135 on: May 30, 2014, 12:16:04 AM »
Quote from: calj737 on May 29, 2014, 08:48:20 PM
Admit it, you just feel the need to be naked, Don.

I spent the day Tuesday with my brother who was out from Riverside at the dealership. Still have a woody over the '14 K1300s. Putting some of my older bikes up for sale to squirrel away some dough for that dude- I just hope that fund doesn't get eaten up with the R90 project  :-\

Pardon the thread jack. I'm feeling the serious pull to sell my beloved RC51 to start a S1000R fund. Absolutely amazing bike, and a more comfortable riding position, and it out-performs the RC51.

Anyone interested in a pristine RC51 SP2 with less than 6800 miles?
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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 mark9331

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Re: 1974 CB350F - First Restoration
« Reply #136 on: May 30, 2014, 08:25:55 PM »
Quote from: calj737 on May 29, 2014, 08:11:12 PM
Quote from: mark9331 on May 29, 2014, 04:15:59 PM
Started watching Long Way Round and I am absolutely convinced I need a BMW now!  Maybe in a couple years.

I could have told you that! SOHC bikes are great. But BMW bikes are amazing. It would be a very complement to your 350

I think it would be a nice balance to have the 350, the 600 RR and the BMW... Just my opinion.  I will see if I can convince her of that lol.
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Offline mark9331

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Re: 1974 CB350F - First Restoration
« Reply #137 on: May 30, 2014, 08:43:59 PM »
Quote from: mark9331 on May 29, 2014, 04:14:30 PM
Quote from: jamesv220820 on May 29, 2014, 10:21:58 AM
looking good so far!  Hey if you find yourself in the garage can you do a couple measurement for me? ( since my bike is in boxes)

Can you measure the distance from the top of the headlight bucket to the the gauges, where they hit?

And Also the front of the headlight to the gauges. 

I ask because I was thinking about getting this little headlight shield and getting it painted the bikes color.

I need to see if the guages will clear it or if I need to get a small coupler nut to life the gauges ever so slightly.  thanks

-cheers

-james

I will when I go down a little later.  That guard would look nice painted!

Let me know if I did not get something measured right!!







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Offline jamesv220820

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Re: 1974 CB350F - First Restoration
« Reply #138 on: May 31, 2014, 10:23:46 AM »
you are the best mark!  I appreciate it!

cheers

-james
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There is nothing to fear but fear itself . . . and trying to restore a cb350f

Offline mark9331

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Re: 1974 CB350F - First Restoration
« Reply #139 on: May 31, 2014, 10:51:40 AM »
Quote from: jamesv220820 on May 31, 2014, 10:23:46 AM
you are the best mark!  I appreciate it!

cheers

-james

Let me know if you need more measurements! No problems at all!
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Offline mark9331

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Re: 1974 CB350F - First Restoration
« Reply #140 on: June 09, 2014, 07:38:46 PM »
Uhh...  I have been bad about posting for awhile.  First I was getting prepared for the trip to the vintage races in Wisconsin and I also took a weekend off from working on the bike.  The trip to the races was great!  I saw a couple other CB350F and one was for sale at $1200 not restored and seemed to be in a little rougher shape than mine so that was nice.

Either way I jumped back in today.  I am still having major problems with my idle.  I am not sure what it is.  When the choke is on it seems to run like it is supposed to.  I let the engine warm up and then turn the choke off it still wants to die.  I just replaced the slow jets with "stock" new ones.  No difference.  I also checked my idle screw.  I ended up screwing it in pretty far just to be sure that I did not have it out too far.  Still nothing was working.  With the choke on I am able to put it into first and walk it around fine.  Not sure what else could be causing this.  Any suggestions?
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Offline 2strokeTrush

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Re: 1974 CB350F - First Restoration
« Reply #141 on: June 09, 2014, 07:40:40 PM »
Points adjusted ?  Mess with the throttle cables at all?
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Offline HondanutRider

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Re: 1974 CB350F - First Restoration
« Reply #142 on: June 10, 2014, 04:41:43 AM »
Quote from: mark9331 on June 09, 2014, 07:38:46 PM
Uhh...  I have been bad about posting for awhile.  First I was getting prepared for the trip to the vintage races in Wisconsin and I also took a weekend off from working on the bike.  The trip to the races was great!  I saw a couple other CB350F and one was for sale at $1200 not restored and seemed to be in a little rougher shape than mine so that was nice.

Either way I jumped back in today.  I am still having major problems with my idle.  I am not sure what it is.  When the choke is on it seems to run like it is supposed to.  I let the engine warm up and then turn the choke off it still wants to die.  I just replaced the slow jets with "stock" new ones.  No difference.  I also checked my idle screw.  I ended up screwing it in pretty far just to be sure that I did not have it out too far.  Still nothing was working.  With the choke on I am able to put it into first and walk it around fine.  Not sure what else could be causing this.  Any suggestions?

You probably need to adjust the idle stop position to give it more gas when idling.  Study how the choke mechanism pulls the throttle on slightly and how the idle stop prevents it from returning.  You should be able to observe these linkages when you activate the throttle and choke without the motor running.
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Offline coal909

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Re: 1974 CB350F - First Restoration
« Reply #143 on: July 01, 2014, 08:26:40 PM »
hey you might find these videos pretty helpful, the guy does a great job on explaining and filming plus it's the same model


https://www.youtube.com/watch?v=QlEW3q7eYEU&list=PLBfq8Rf4JUQoor8yv3uyMdadpXoksUDHY
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