Author Topic: 1973 CB350F "Modest Original" build  (Read 102117 times)

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Online RAFster122s

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Re: 1973 CB350F "Modest Original" build
« Reply #550 on: January 11, 2017, 11:37:59 PM »
BTW, Dime City carries a replacement coil for $36 as well but the wire connection to the coils looks funny.  Another optionis to use NGK coil wire splice kits.  You cut the existing wire out of the coil for proper length to use the splice kit.  4into1 carries them and I am sure others do as well.
 Just buy new copper core wire and splice in new wire and use some new NGK cap ends (XD03F and SD03F,pair of each for thread terminal ends or the E model caps for the other plug type ends...)
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Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #551 on: January 12, 2017, 06:50:05 AM »
Nice work Atlas  8)
The Volvo P1800 looks good too;I'm still on my orig. pistons and bore w/ new rings installed at 130K and I have 480K on my 93' B230F engine now w/ plenty of power and strong compression.I think changing the oil & filter on these Volvo engines at regular intervals will make them last forever.
« Last Edit: January 12, 2017, 09:02:12 AM by grcamna2 »
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #552 on: January 12, 2017, 08:50:39 AM »
You can do some surgery on the coils if you are inclined. Price out some new wire to figure the cost of the copper core wire. Then a tube or two of JB weld and some silicone glue. The spark plug wire goes through the body connecting at the opposite end of where it enters. You have to cut the plastic body back and carve a groove for your new wire. Cut the old wire leaving room in the coil body to solder the end of the copper core to the end of the copper  wire nside the coil.  Then you cover the connection with silicone and when set you then pot around the wire with the epoxy to hold it in place.  Alternatively some just fill below and around the wire with silicone.  Just can't pull on the wires without risking separating the silicone from the body of the coil.  Wipe down the wire with acetone and then denatured alcohol to remove and mold release or oxidation of the rubber sheath of your new wires.  Leave a couple inches extra so you don't have to redo wires when you replace the plug caps again and trim off 3/4" for your new caps.

Allternatively, pick up a pair of new aftermarket coils from cb750supply.com for $36/ each.  HondaMan recommends them as a great stock coil replacement.

BTW, Dime City carries a replacement coil for $36 as well but the wire connection to the coils looks funny.  Another optionis to use NGK coil wire splice kits.  You cut the existing wire out of the coil for proper length to use the splice kit.  4into1 carries them and I am sure others do as well.
 Just buy new copper core wire and splice in new wire and use some new NGK cap ends (XD03F and SD03F,pair of each for thread terminal ends or the E model caps for the other plug type ends...)

Thanks for the info RAF!  I would really like to "test" these coils and remaining spark plug wires lengths.  Is there any easy way to do so?  And would a test be very informative?

I assume this is the coil you mentioned.



It doesn't mention CL350 as a 'fit' but the 5k ohm output is correct.  I am assume this just means the mounts won't quite be right.  I would PREFER a coil with removable spark plug leads, if I were to go the replacement route.  This seems more future-proof.  Something like the dynatek 5k ohm ones http://4into1.com/dynatek-5-ohm-black-coils-single-output-dc10-1/.  What are your thoughts on these?

Nice work Atlas  8)
The Volvo P1800 looks good too;I'm still on my orig. pistons and bore w/ new rings installed at 130K and I have 480K on my engine now w/ plenty of power and strong compression.I think changing the oil & filter on these Volvo engines at regular intervals will make them last forever.

I think you are right!!! That is awesome grcamna2 -- ENJOY  8)

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #553 on: January 12, 2017, 10:13:21 AM »
Okay went down there this AM to take another look.  I pulled apart the black w/ white stripe existing bullet et voila!  It's a quad - score!  Last night I misread this as a double.  This means I won't need to go with the triple and can just plug right into the back.  Neat-o.  I will solder on the remaining bullets today.



I also decided to try to poke around and work out this coil resistance and what not...first step primary winding.  Cobbling together what I gathered off the internet for various bikes, I decided to stick one lead of my multimeter on one of the signal wires (yellow for L, blue for R), and the other on one of the existing black w/ white stripe bullets.  Success!  And the readings were indeed informative.  Here is Right:

4.8 ohms resistance, right in the 5 ohm desired range!


And Left:


Spot on!  Then I figured to check the secondary winding I could leave one lead in the signal wire for the coil (yellow or blue) and stick the other lead up the spark plug wire with the cap off.  These results mean less to me..but maybe someone can interpret them.

10.12k ohms for the left


9.76k ohms for the right


Now I figured, for science sake, lets try the same test but with the spark plug caps back on. 

18.17k ohms for the left


19.16k ohms for the right


This makes PERFECT SENSE!  I love it when things like this click.  If we recall the last post the left and right spark plug caps were showing somewhere in the region of 8k ohms resistance and 9k ohms resistance.  Each wire was around 10kohms..8 (or 9) to 10 = 18 and 19k ohms!  Just as we see above!

To many of you this is a "well...duh" moment but to me it is pretty neat.  Would love to hear your thoughts on the ~10k ohm figure I am seeing out the secondary side of the coil through the spark plug wire.  Is this good shape?  What is my ballpark. 

Thank you!

Offline calj737

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Re: 1973 CB350F "Modest Original" build
« Reply #554 on: January 12, 2017, 11:48:04 AM »
15K through the coil is ideal (for 5k coils  ;))
'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 iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #555 on: January 12, 2017, 01:28:19 PM »
15K through the coil is ideal (for 5k coils  ;))

For the secondary winding?  And I am getting 10k and 9.7k..?  Do they go down as they wear?  Thanks cal!  I assume the first two figures for the primary winding of 4.7 and 5 ohm are good - right?  Unless I did the tests wrong!!

Offline calj737

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Re: 1973 CB350F "Modest Original" build
« Reply #556 on: January 12, 2017, 04:18:36 PM »
Primary + Secondary = ~15k
You might see slight variations in your readings due to resistance of the power wires, plug wires (individually) and the Yellow/Blue wire connections. You're in search of a total within the accepted range (15k for 5.O coils).
'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 iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #557 on: January 12, 2017, 05:35:24 PM »
Primary + Secondary = ~15k
You might see slight variations in your readings due to resistance of the power wires, plug wires (individually) and the Yellow/Blue wire connections. You're in search of a total within the accepted range (15k for 5.O coils).

Comprende - looks like I am all there so that is sweet!



The wiring on the Pamco ignition is COMPLETE!  Finding that four bullet female meant I could tackle the job today.  Step one was to solder on the remaining bullet and ring terminal.  Done and done.  Then I began by wiring the electronic advance unit (sensor side) to electronic points plate.





Very satisfied with these bullets so far.  A nice snap and they're in!  I moved over to the other side of the unit, out the coil end.  Two leads acting as signal wires, one to each coil.  The ring terminal connected to a frame ground, I chose this nice bracket with the spark plug holder in it and gave it a light sanding before attaching.  And finally the red bullet to the four female black w/ white stripe connector.  This is (I believe) +12v off the ignition switch.



At this point I figured it was time for a test run.  Everything was loosely laid out but I didn't want to affix it to it's final home just yet in case there were any issues.



I had HOPED to be able to run this with the tank off...



...but I made a mess with the temporary fuel lines so lets just move on and pretend I didn't do that.  It seemed my only option was to install the tank fully (with the dreaded cross flow tube) before I continued.  This meant finalizing the install somewhat more.

PS: I also installed new fuel line off the petcock with some cool "moose" clamps.  The two way quick disconnect valve will be going on that long crossflow tube.



I started by bundling the sensor side bullets on top of the e-advance unit.  This seemed to be a decent coupler.  I convinced them to stay put with a zip tie.



The box was then pressed into place just in front of the battery, it was a perfect fit.





From here I zip tied the bundle through the frame.  It is quite solid, but not to tight to worry me.  I snaked the right side out, along the frame, and to the rest of the coil wires.





The other side also went out, along the frame, and met up with the points signal sender unit.





Both sides of the unit are zip tied under the main frame rail to keep them from getting snagged on the tank or anything else.  You can see in this picture from under the tank.



And with the tank mounted everything is still good and snug!



All in all I was very happy with how this wired up!  The bullets are high quality and the installation was relatively unintrustive.  No changes to the stock harness were made, and all the necessary parts found a home.  Now for the big moment....



Yes! Yes! Yes!  She runs and sounds awesome.  I continued with the install and adjusted the points plate with the timing light.  After a slight adjustment, the fire mark is spot on and the advance kicks in when it is supposed to (Very early, 1300rpm with this unit).  Sweet! 

Now just waiting on those new plug caps and I think this bike will be really happy.  I still plan on decreasing the float height to about 24mm as it is still seeping out the float bowl tops.  Really happy with the Pamco so far, and I think the bike is to!  Took it one rev to 5k and it snapped up no problem.  Will wait for the new caps before trying more.   8)

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #558 on: January 13, 2017, 07:06:36 PM »




Out with the old..





In with the new!  IRC GS-11.  I picked because I really wanted to maintain the vintage tread pattern.  I think these GS-11's do great without looking too big.  Very happy so far!  The tires on there now are the original from 1973....very neat and still full of tread, but petrified.  Feels like riding on a sheet of ice!  Should have these mounted by Monday.

Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #559 on: January 14, 2017, 07:05:10 PM »
Nice  8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
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Offline scunny

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Re: 1973 CB350F "Modest Original" build
« Reply #560 on: January 14, 2017, 09:31:56 PM »
going to be a very nice looking bike. following.
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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #561 on: January 17, 2017, 12:24:43 PM »

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #562 on: January 17, 2017, 09:23:23 PM »
Ta-da!



These things look SWEET!  8)

Just need to torque rear axle nut, don't have a 22mm socket handy so that is on order.  Plug caps tomorrow AM and we are good to go for a test drive.  Then back in to knock a mm off the float height and install the tank crossflow quick disconnect.  Looking forward to it!

Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #563 on: January 17, 2017, 09:34:31 PM »
Looks good on there Atlas  8) How's the P1800 ?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #564 on: January 18, 2017, 10:29:29 PM »
Looks good on there Atlas  8) How's the P1800 ?

Thanks!  P1800 is in deep clean mode...rings arrived a day or two back and now we are in prep mode before the install.  Exciting!

As the for CL, the new plugs went on no problem.  What an easy installation!  A no brainer on every bike, and absolutely a must check item.  First up was to test the new plugs.



Perfect!  Resting figure was closer to 4.7k ohms.  Then trimmed the spark plug wire.  As mentioned I didn't have much wire length to work with, so I was very worried about going too far!



Luckily I didn't have to go very far to reveal good wire core.  Phew!  The new ones twisted right on.

And just like the tires...out with the old,


In with the new!


Based on what we've found on the rest of the bike these plug caps look like they were FACTORY Honda from 1973 ?!



At least that's what the "Hm" looking stamp is telling me.  Neat!  But worthy of a change...

Gave her a kick and she turned right on!  Tomorrow (weather permitting) is the big test drive  8)

Offline flybox1

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Re: 1973 CB350F "Modest Original" build
« Reply #565 on: January 19, 2017, 09:34:29 AM »
Just read thru a bunch.  Nice build.  Love the color.  8)
Flip your rubber tank mount 180.  The triangular pull tap points towards the rear  ;)
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Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #566 on: January 19, 2017, 09:40:55 AM »
Just read thru a bunch.  Nice build.  Love the color.  8)
Flip your rubber tank mount 180.  The triangular pull tap points towards the rear  ;)

D'oh!  Thanks..will do when I install the quick disconnect.  :D

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #567 on: January 20, 2017, 04:29:14 PM »
Today was an awesome, awesome, AWESOME day!  A friend has been on the hunt for an old time Honda for the past two years.  He wanted The One.  Today we bought this. 









Based on the smile on his face I can tell you we did good! This thing is sweet as can be.  1973 CB350F, untouched and all there.  Talk about motivation to get mine going - this was my first ride on a little Four and it was brilliant.  More to come on this bike and mine.  It could do with a new air filter but other than that is happy as can be.  Picking up early next week.  Woohoo!

Offline seanbarney41

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Re: 1973 CB350F "Modest Original" build
« Reply #568 on: January 20, 2017, 05:31:18 PM »
that bike was posted for sale on this forum, correct?
If it works good, it looks good...

Offline iiAtlas

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Re: 1973 CB350F "Modest Original" build
« Reply #569 on: January 20, 2017, 06:05:53 PM »
that bike was posted for sale on this forum, correct?

It may well have been!  We found it on Craigslist.  Seller was absolutely great - if you're on here..thanks Andy we are ECSTATIC!!

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Re: 1973 CB350F "Modest Original" build
« Reply #570 on: January 20, 2017, 06:15:53 PM »
that bike was posted for sale on this forum, correct?

It may well have been!  We found it on Craigslist.  Seller was absolutely great - if you're on here..thanks Andy we are ECSTATIC!!
I do believe that is member 736cc.  Recognize him from this famous video...
If it works good, it looks good...

Offline seanbarney41

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Re: 1973 CB350F "Modest Original" build
« Reply #571 on: January 20, 2017, 06:22:03 PM »
the for sale thread has not yet been updated
forums.sohc4.net/index.php/topic,161008.0.html
If it works good, it looks good...

Offline Godffery

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Re: 1973 CB350F "Modest Original" build
« Reply #572 on: January 20, 2017, 11:29:25 PM »
 I spy a KZ in the background of one of those pix...! =)

Offline grcamna2

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Re: 1973 CB350F "Modest Original" build
« Reply #573 on: January 21, 2017, 06:00:24 AM »
I spy a KZ in the background of one of those pix...! =)

I can't see the KZ,reminds me of when I was a kid, 'find the motorcycle in the background'  :D Unless it's right next to the 350F?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline bill440cars

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Re: 1973 CB350F "Modest Original" build
« Reply #574 on: January 21, 2017, 08:32:39 AM »

        Cool Thread here, makes me want to drag out my Sl350K0 ("Work In Progress") and Make some more progress with it. An, I also have "reproduction air cleaner covers for it too.
« Last Edit: January 21, 2017, 08:34:12 AM by bill440cars »
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