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Author Topic: 1973 CB350F Full Rebuild  (Read 6054 times)

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Offline bnjnz

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1973 CB350F Full Rebuild
« on: July 05, 2011, 07:37:54 PM »


Project CB350F, Day 1
1973 Honda CB350F: Four Cylinders/Carbs, 15K miles, complete bike

I picked up the bike on Craigslist, hasn't been run in 12 years and was parked for unknown reasons. The current goal is to prove the motor is good so i can tear it apart for a full rebuild.

Day 1 was not very productive. All four carbs leak severely and the ignition system is crap. I was hoping to not have to rebuild all four carbs before i prove the motor is good, but that may not be the case. Pulled/replaced plugs and the ignition points. Next weekend should be more productive.
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1973 CB350f

Offline csc

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Re: 1973 CB350F Full Rebuild
« Reply #1 on: July 06, 2011, 02:43:39 AM »
Its good to see a 350f being rebuilt/ restored ,seems like u dont see many 350's being redone . Parts seem scrace on the parts for sale list,even on Ebay ,quality parts are few and bring a premium..  It looks like ur bike has agood start being basically complete.
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It Aint a Sin to be Poor, Its just un handy as Hell                                                                                               72 cb350F

Offline johnny

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Re: 1973 CB350F Full Rebuild
« Reply #2 on: July 06, 2011, 07:45:22 AM »
Great start! I love my 350F. I can't wait to see the progress!
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1976 CB550K
1974 CB350F http://forums.sohc4.net/index.php?topic=81781.0
1974 CB550K
1972 CB350 Twin
1965 Lambretta
196(?) Honda S90
1975 Ford Bronco

Offline bnjnz

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Re: 1973 CB350F Full Rebuild
« Reply #3 on: July 06, 2011, 06:00:54 PM »
It was a steal on craigslist but definitely got my hands full.  I think i am going to go ahead and tear it down.  I have not totally ruled swapping in  400cc motor.  I do have a concern for sourcing parts for this bike. 
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1973 CB350f

Offline RickB

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Re: 1973 CB350F Full Rebuild
« Reply #4 on: July 07, 2011, 01:38:54 PM »
Finding parts for my CB400F has been very easy thanks to David Silver Spares. The only part I had real trouble getting was a NOS camshaft and finding an affordable original exhaust in good condition. However DSS now make a replica exhaust and webcam or megacycles cam sell rebuilt camshafts.

Good luck with it. Any questions, just ask as the SOHC4.net community is always willing to help.
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Offline bnjnz

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Re: 1973 CB350F Full Rebuild
« Reply #5 on: July 22, 2011, 10:18:26 PM »
Looks like the airbox had some previous tenants.
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1973 CB350f

Offline hoodellyhoo

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Re: 1973 CB350F Full Rebuild
« Reply #6 on: July 24, 2011, 07:16:18 AM »
They must also enjoy the lovely intake noise these bikes make at higher revs!
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1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline bnjnz

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Re: 1973 CB350F Full Rebuild
« Reply #7 on: July 24, 2011, 06:46:27 PM »
Project CB350F, Day 19

Bike is 50% disassembled, I just need to label the wiring connections before I totally remove the wiring harness. Current goal is to have the motor pulled before Labor Day.


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1973 CB350f

Offline bnjnz

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Re: 1973 CB350F Full Rebuild
« Reply #8 on: August 28, 2011, 08:58:49 PM »
Day 51

It took two days this weekend to pull the carbs from the rubber boots on the motor.  They were stuck on there good.  I was worried about breaking either component. Some gentle prying got everything off.  Unfortunately this weekend was a wash because i wasted too much time on the carbs.  Still trying to have everything to bare frame in two weeks.
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1973 CB350f

Offline gus203

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Re: 1973 CB350F Full Rebuild
« Reply #9 on: August 29, 2011, 07:25:08 PM »
Good luck on the rebuild. Just about got my 350F chopper/bobber style road worthy. I built it from 3 different bikes and it is a blast to ride. I'll be watching for your updates.
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Offline bnjnz

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Re: 1973 CB350F Full Rebuild
« Reply #10 on: September 13, 2011, 09:22:22 PM »


Motor is in the stand and the bike is down to the bare frame.  i will try to open up the motor over the next few weeks.  i go on an extended schedule at work and that will tie me up until November.  But i will plug away at it when i can.

I've been on you tube searching for clips of the 350's running just to hear what they sound like.  I've gotten the bug now for sure. 

If anyone wants to post a pic of what their 350 looks like please do.
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1973 CB350f

Offline esquire

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Re: 1973 CB350F Full Rebuild
« Reply #11 on: September 28, 2011, 08:50:10 PM »
I'll soon be embarking on this as well. I pick it up next week. Mine is running but doesn't charge the battery, fuel overflows a bit (one or more stuck floats I assume), and I'm possibly going to have to rebuild the front brake.



The guy who is selling it to me let me test ride it, and the ride was so smooth that I banished my apprehension of taking on a project and caught the bug as well. I'll get a project thread going once I've got mine.
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1973 CB350F

Offline hoodellyhoo

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Re: 1973 CB350F Full Rebuild
« Reply #12 on: September 29, 2011, 07:51:09 PM »
there's pics and video of my bike in my project thread (link in my sig line). I'llbe watching your engine rebuild progress with great interest. I would like to do the top end gaskets on my 350 this winter.
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1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline Owned

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Re: 1973 CB350F Full Rebuild
« Reply #13 on: September 30, 2011, 03:59:38 PM »
Gosh.  I'm glad to see that my bike isn't the only one here that pisses fuel every now and then.  ;)
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'74 Honda CB350F
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Offline lucky

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Re: 1973 CB350F Full Rebuild
« Reply #14 on: October 02, 2011, 11:06:19 AM »
Quote from: Owned on September 30, 2011, 03:59:38 PM
Gosh.  I'm glad to see that my bike isn't the only one here that pisses fuel every now and then.  ;)

Just buy new float needles. If they are the all metal style, buy the float and seat.
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Offline bnjnz

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Re: 1973 CB350F Full Rebuild
« Reply #15 on: October 16, 2011, 07:13:08 PM »
I look forward to following everyone else's progress as well.  I have a few weeks left on an extended schedule at work, i just have no time right now to do anything.   But i will hit the ground running as soon as i get a break.   
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1973 CB350f
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