Author Topic: Frame-up cb350f restoration, hunk o' junk transformation  (Read 55956 times)

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Offline markreimer

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Frame-up cb350f restoration, hunk o' junk transformation
« on: August 31, 2015, 08:46:27 AM »
Hello!

This weekend I was offered a cb350f for free. Yes, free I said! It was in pieces but mostly all there I was told. My wife has been wanting a bike of her own so I thought this would be perfect for her first motorcycle. When I went to see it, I realized just how much work I was in for. The engine is completely apart, with rusty cylinders, missing pistons, rusty valves (one of which is stuck half in the guide, likely bent), frame is rusted all over, missing tank/seat/exhaust, and the rest of the bike is stuffed into a handful of boxes and pails.

So! Looks like I've got a great opportunity to do my first complete frame-up restoration. Winter is coming anyway, so now I've got something to keep me busy.

I've had a cb750 K4 for the last five years and have rebuilt everything on it except for the transmission, charging system, and wheel bearings. Pretty sure I've had everything else apart and rebuilt. So I have a base-line understanding of how this bike will come together, which I expect to be pretty helpful.

My wife and I are on a really tight budget for this so I expect to spread the work out over the winter and do as much of this myself as possible, and look for creative ways to keep costs down. That said, I hope to come out in the spring with a bike that looks great and is reliable.

Here's my immediate checklist:
- acquire a TOD (Canadian version of a title) before investing a penny in the bike. I'm doing that later today
- Move all the parts over to the shop and do an inventory of what is missing, what is garbage, and what can be salvaged
- strip the frame down and either have the frame/swing arm/triple clamps/misc powdercoated, OR strip it myself and paint it to save some cash (probably going to go that route).


I've also got a line on a local complete cb350f engine from another forum member here, and am hoping to negotiate a price on that later this week. Depending on the condition, that could be a lot cheaper than having to buy new pistons, bore the sleeves, replace valve guides and valves, etc...


Here's a photo of the bike after I removed a few handfuls of dead leaves and cobwebs. BRAAAPPP!!!


Offline SOHC4 Cafe Racer Fan

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #1 on: August 31, 2015, 08:53:28 AM »
A 350 is a great size for a learner bike and something to run around town on.

I think your idea of sourcing a complete (running) motor is good one.  The complete rebuild will require not only MUCH more work but lots of small parts that add up in cost.

Winter is Coming!  Not quite soon enough for us in the heat.

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 markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #2 on: September 01, 2015, 12:23:08 PM »
First milestone achieved - I acquired a fresh TOD/title for the bike! First time it's had one in at least thirty years. So now that the bike is legally mine, I can start putting some time and effort into it.

I received a great quote on powder coating the frame, swing arm, triple clamps, side/centre stands, and battery box for about $200. Can't beat that... I've used the guy for bicycle stuff in the past many times and was always happy. So I'll start by stripping everything down and sending it off for refinishing. The fun begins...

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #3 on: September 01, 2015, 02:39:37 PM »
Well this has taken an unusual turn already. The forum member with the spare 350f engine alerted me to a guy trying to get rid of his '74 cb350f which he's owned since 1980. Been parked indoors for the last few years. It's all there, titled, ran as a daily rider until parked a few years back for whatever reason. I'm picking it up tomorrow for $300, what a score!

At minimum I'll need to replace the battery, clean carbs, fork seals, brake pads, brake fluids, oil change, adjust valve and points, all that typical stuff you do with a new old bike. He said it could probably use a new wiring harness, which makes me wonder what kind of electrical issues he may have had. Anyway, hard to say until I have it in my hands tomorrow and can do a complete assessment.

This all means that I've now got TWO titled cb350f's,which means I can restore the complete bike for my wife to learn on, and build the parts bike up as a mean cafe for ME, hah!!

To be continued...

Offline 2strokeTrush

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #4 on: September 01, 2015, 02:49:30 PM »
I like where this is going
If You Aint First Your Last!!

 350F project-http://forums.sohc4.net/index.php?topic=133079.0

500F Project-http://forums.sohc4.net/index.php?topic=135660.0

Offline SOHC4 Cafe Racer Fan

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #5 on: September 01, 2015, 02:57:43 PM »
That's an amazing deal for a titled bike.  Let's hope she fires with a carb cleaning, new oil and battery, and cleaning the fuel lines.
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 Restoration Fan

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #6 on: September 01, 2015, 03:52:46 PM »
Ron

Stella - Logan's Senior Project    78 750K http://forums.sohc4.net/index.php?topic=141761.0

Logan's Reward - CB500 and CB550 Cafes    http://forums.sohc4.net/index.php/topic,147787.0.html

Offline SOHC4 Cafe Racer Fan

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #7 on: September 01, 2015, 04:21:20 PM »
That's a good little bike in pretty good shape.  There doesn't appear to be much rust, or an overly large amount of dust.  It looks like it was stored with care.
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 jneuf

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #8 on: September 01, 2015, 07:15:42 PM »
Going to be following this one. The only thing better than one new bike is two!
'75 CB400f

Offline carnivorous chicken

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #9 on: September 01, 2015, 07:46:02 PM »
Nice score. How is the exhaust on that one? Still intact?

My wife and I have his and hers 350Fs. I've had a few over the years, but "mine" I've had for almost 20 years. Great bikes!

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #10 on: September 02, 2015, 09:31:55 PM »
Picked up the second 350f. It definitely looks nicer in the picture than real life hah! Lots to do here.  It hasn't been run since 1980, but was parked with gas in the system. The carbs are a gong show, petcock is fused, tank has surface rust. Looks like it was dropped on the left side as the side cover is scratched, small dent in tank from the forks and a broken headlight mount and bent fender. Also has a head gasket leak around the front of cylinder 1. Oh and all four mufflers have huge holes where they meet the headers. Thankfully the headers are still good though. I may try to weld a patch for now, but it needs something new down the road.

Even so, it's all good and I'm excited. Wife was so excited and the PO was very emotional letting it go.

Tomorrow I'll get some good photos to share. I'm going to soak the carbs and petcock in 50% pine sol for two days as a start. I've never treated a rusty tank but I'll look into options for that as well. A new battery, plugs, filters and oil and and with any luck I'll try to kick it over within a week.

Oh, and it had less than 2,000 miles!! All the gaskets are dried out from not being used, a shame. I wonder how many places I'll have oil leaks spring up.


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Offline SOHC4 Cafe Racer Fan

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #11 on: September 02, 2015, 10:28:02 PM »
Still is a great deal -- $300 titled bike!!   8)
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 2strokeTrush

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Frame-up cb350f restoration, hunk o' junk transformation
« Reply #12 on: September 03, 2015, 05:39:23 PM »
Big fan of the 350s. My first was a nice little one I loved it.  If the carbs are gummed up badly I would use carb soak then pine sol. For your tank if it's rusty inside seal off the holes and fill with 4 gallons of vinegar, shake daily for a week or so if it's bad inside. When the day comes that your happy with the inside dump it out, rinse it with water and baking soda over and over. Then wash with regular household alcohol, follow with a quart of ATF and then fill her up. A few 350f builds here have started and died recently, would be great to see one actually go through! Get her going!
If You Aint First Your Last!!

 350F project-http://forums.sohc4.net/index.php?topic=133079.0

500F Project-http://forums.sohc4.net/index.php?topic=135660.0

Offline WhyNot2

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #13 on: September 03, 2015, 06:16:44 PM »
dayyyyyum......good deal...!!!!!!!
If it ain't raining, I'm riding.....~~{iii}?~~prost

If it sounds like I know what I'm talking about, it's because I cut and pasted from someone else.

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #14 on: September 03, 2015, 06:24:28 PM »
Big fan of the 350s. My first was a nice little one I loved it.  If the carbs are gummed up badly I would use carb soak then pine sol. For your tank if it's rusty inside seal off the holes and fill with 4 gallons of vinegar, shake daily for a week or so if it's bad inside. When the day comes that your happy with the inside dump it out, rinse it with water and baking soda over and over. Then wash with regular household alcohol, follow with a quart of ATF and then fill her up. A few 350f builds here have started and died recently, would be great to see one actually go through! Get her going!
Funny you suggest that as I just got home with 8L of white vinegar for just this purpose! I have it full of Pine Sol at the moment as it still had some gas in there (30 years old!!!) and there was varnish all over. So I'm hoping this cleans that up over the next day, then I'll follow up with the vinegar treatment for a week.

I've been reading about tank treatments all afternoon. I was going to go with a POR-15 treatment if I could find it, or red kote, but they both seem impossible to find locally. I'm intrigued by your suggestion as I have all of those things in my house right now. The ATF, does that create a film over the steel to prevent rust?

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #15 on: September 03, 2015, 06:56:59 PM »
Ok well I learned why the PO suggested that I should probably look into getting a new wiring harness lolololol....

I had a few spare hours to dig into the bike. My goal was to get a good starting list of things I'd need to repair, what I should order, etc. That and I wanted to start soaking the carbs today so I could finish cleaning them on Saturday. More on that later.

But first, the wiring. I popped off the side cover, which is in perfect shape by the way. No cracks or anything. And oh, what a site! This bike was definitely on FIRE at one point. All the housing was burt to a crisp and crumbled away in my hands as I touched it. Just ash remained. Pretty much all the wiring in this part of the bike is like this. What's odd is that there is no damage to the paint, side cover, frame, or even rubber component mounts! It must have been some kind of massive short that fried all the wiring and housing very quickly. I guess I won't be attempting to fire this up any time soon at this rate.  :(

All the other wiring on the bike seems to be in great shape. It's quite flexible and clean. So I guess I could spring for a complete new harness, or try cutting the harness back till the wiring is good and just replace everything from there. I'd only do that if it was cheaper, which it probably is, but also that's inviting a lot of headaches down the road since there's no way I can splice an entire harness and not screw at least ONE connection up. I'm not sure... What would you do? I'm really not sure at this point.

From there I popped the carbs off. Wow, and I thought cb750 carbs were a pain in the ass to remove. These are even worse!! After a while I got them off and removed the float bowls. Looked like they were filled with some really rank maple syrup. The first bowl wasn't too bad, but the next three were super gummy. I couldn't' even remove the floats since the retaining pins were seized in there. I tried tapping them out but no luck, and I didnt 'want to go too hard and snap the posts. I soaked them in carb cleaner, still no good. So for now I'm leaving them off as the entire rack takes a two-day bath in 50% diluted Pine Sol, together with the petcock (which was equally gummed up).

Moving on, I inflated the 42 year old tires and they held air! Much easier to push around the shop now. But I did find four broken spokes on the rear wheel. I guess I'll have to replace them at the minimum when I put a new tire on, but should probably re-lace the whole wheel honestly.

The tank was up next. After removing the petcock for cleaning, I filled it up with the same Pine Sol solution to remove the fuel varnish. Then it's a week of white vinegar baths combined with some BBs or random bolts to break up the rust. I'll be doing that on Saturday, as well as removing the carbs from their bath and going at them with compressed carb cleaner.

I'm pretty sure this bike suffered an unfortunate fall on the left side the more I dig in. The front fender is mangled, the left headlight bracket is snapped in half, the alternator cover is scratched up, and the wiring on the left had some kind of short. Who knows if they are all related, but with only 1,941 miles on the clock, it was either one big spill or the PO spent a lot of his time falling over!

I'm still waiting on a key to arrive in the mail as well, so I can't even jerry-rig some kind of connection to the ignition system to try and turn it over when the carbs are gone. Well not without some additional creativity I suppose. So in the mean time my focus this weekend will be cleaning the *#$&#*$ outta those carbs till they're good enough to eat off of, checking the condition of the forks, attempting to remove the seat (which is locked with no key) so I can get at the wiring a bit better, and cleaning up the tank. Probably put a big order of new parts in on the weekend too.

That's the news.

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #16 on: September 03, 2015, 06:58:35 PM »
A few more  :o

Offline 2strokeTrush

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #17 on: September 03, 2015, 08:05:54 PM »
I like what I'm seeing! First off yes the ATF does coat the inside to prevent flash rust! As far as coatings do some research into "casewell" liners. Lots of members here have good results. From what I can see you should spend about a hour or two collecting parts online. Some pieces just need to be replaced. 4into1.com has lots of little pieces and bits you will need.
If You Aint First Your Last!!

 350F project-http://forums.sohc4.net/index.php?topic=133079.0

500F Project-http://forums.sohc4.net/index.php?topic=135660.0

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #18 on: September 03, 2015, 08:10:56 PM »
I was looking there earlier, so much good stuff. Sadly my budget inhibits my ability to just go and order away.

I found a used wiring harness on eBay for $25, needs some repair but that's easy on the bench and $100 cheaper. I do need a carb rebuild kit though, spoke kit, master cylinder rebuild, petcock rebuild, and a few other pressing items. Good times.


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Offline knowsnothing

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #19 on: September 04, 2015, 07:01:22 AM »
Not a bad start even given the wiring situation.   A new harness is required for sure.  If it were me, i would save until i could buy a new one.  David silvers have them and yes they are expensive, but chasing electrical gremlins sucks more.  I would also think about upgrading to one of the solid state reg/recs (can be had for ~$60) and ditch the old stuff.  Your rectifier is fried anyway and it is probably easier to just replace both. 

Those carbs do look a little dirty, but are really in good shape.  Take your time and go easy on those pins and posts.  It may help to completely brake them down and separate all the carb bodies.  Warning, I have rebuild both cb750 carbs and cb350f carbs and the 350 ones are by far more complicated.  The linkages and ridiculous, so if you go this route, take a lot of pictures.

Good luck!

ps - You will be a pro at getting that little stupid middle man airbox and carbs on and off by the time you are done, trust me ;)
« Last Edit: September 04, 2015, 07:02:57 AM by knowsnothing »
1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #20 on: September 04, 2015, 07:11:18 AM »
Oh boy haha, more complicated eh? Right on. I'll be taking them out of the bath tomorrow afternoon to pull the floats and pressfit jets out, then continue. I'll make the call on a full disassembly then. I bet you're right though.

I hear ya on the new harness, though I found a used one for $15 and I figure it's at least worth checking out. I bought it last night and should be here soon. I'll  unwrap it to look for any signs of damage, check all the wires for continuity and shorts, replace the connectors. PITA for sure but I have more time than money sooo...

As for the rectifier, how do you know it's fried? I mean I assumed as much, but I'd like to test the regulator, rectifier, solenoid, whatever else is back there first. I have no clue how to do that so I guess it's time for some research.

Oh also worth noting that I do still have a near complete 350f in boxes. I haven't gone through it close enough to know if all these parts are there too, but I may be able to poach everything from there if I'm lucky


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Offline knowsnothing

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #21 on: September 04, 2015, 07:19:20 AM »
I hear ya on the new harness, though I found a used one for $15 and I figure it's at least worth checking out. I bought it last night and should be here soon. I'll  unwrap it to look for any signs of damage, check all the wires for continuity and shorts, replace the connectors. PITA for sure but I have more time than money sooo...

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Good on ya  ;D  $15 is a good deal.  Hopefully it is in good shape. 

The rectifier may not be fried per say, but the wires coming off it definitely are and they are actually riveted to the rectifier under those rubber ends.  To replace those you will need to drill them out and then probably re-rivet wires back on.  The way to test everything can be found in the honda manual which is somewhere on this forum.  I know this because my 350 recently had a charging issue.  Turned out my pristine looking rectifier was bad, but the spare i had with melty wires tested good.  But to make 1 good one was too much of a pain in the ass, so i just bought one from amazon for $40 something.  I also let me replace the 40+ year old regulator in one step.

Here it is mounted up.  Had to make 2 aluminum brackets to get it to fit

« Last Edit: September 04, 2015, 07:36:56 AM by knowsnothing »
1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #22 on: September 04, 2015, 07:59:56 AM »
Ahh, got it. Boy your wiring looks real nice compared to mine  ::) I'll be using that photo for reference when the harness arrives!

Ok, well I'll test the stuff on the bike tomorrow and see what I've got laying around, but in the mean time see if I can hunt down a cheap replacement.


Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #23 on: September 05, 2015, 03:39:02 PM »
Today was part two of the carb cleaning day.

I removed the carb rack from the Pine Sol bath. The were quite a bit cleaner than before, but not perfect. I was able to remove the stuck float pins and press-fit jets. All the press fit jets are pretty nasty and the o-rings are very deteriorated, so I think I'll just spring for a rebuilt kit. I also freed all four slides/needles, which were totally seized two days ago.

The carb bodies appeared to have a yellowish film that would peel off when scrubbed with a nylon brush or tooth brush. I'm not sure what it was, didn't really seem like it was fuel varnish, but almost a factory finish? Anyone know what that might be? The float bowls had it the worst, but it was also on the rack and carb bodies.

I scrubbed everything down until it was clean, then rinsed the whole thing off in soapy water to remove the cleaner, followed by pressurized water water, then compressed air to blow it all dry. Everything changed colour a bit after, it's a kind of dull grey. Maybe the Pine Sol removed some kind of finish. Next was cleaning with proper carb cleaner. After a bit of frustration, I was able to blast cleaner through all the fuel passage ways. There sure was a lot of crap in there. Now every line and passage flows freely. I scrubbed the bowls and carbs with cleaner, then sprayed the rack with some WD40 incase I missed any water from earlier. They're looking ready for re-assembly now once the kits come in.

Oh, and the needle jets were thoroughly stuck in the carb bodies and I had to press hard on them from inside the throat to push them out, ultimately marring/destroying them all. At least they came out though.

Moved on the the petcock - looks like the old fuel somehow ate through the bottom of the bowl! There was a tiny hole after I finished wiping all the grunge out. The rest of the unit seems fine though, just need a new gasket and filter screen.

Last thing was the tank. I emptied the Pine Sol and filled it with 8L of white vinegar and two boxes of screws. I shook it periodically and the rust seems to be melting away quite quickly! The tricky thing though is that flash rust immediately covers any exposed steel. It comes off very easily, but I think I need more vinegar to prevent exposed steel from rusting until I'm ready to do a lining treatment.

Offline markreimer

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Re: Frame-up cb350f restoration, hunk o' junk transformation
« Reply #24 on: September 05, 2015, 04:32:05 PM »
Hmm so I can't seem to find a source for the needle jet anywhere except David Silver, which is 21 Pounds for ONE  :o :o :o

http://www.davidsilverspares.co.uk/CB400-FOUR/part_3314/

Anyone know of another place to buy these? Honda doesn't offer them anymore. Everything else seems easy to get....