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Author Topic: 1971 CB350 - slightly obnoxious  (Read 17675 times)

Offline Dragonfish

  • Posts: 222
  • Slightly Obnoxious
1971 CB350 - slightly obnoxious
« on: Feb 13, 2012, 18:01:03 »

 
After about a year of looking, I finally found the right bike! A running 1971 Honda CB350K3 posted on Craigslist for $750. I offered him $500 and he took it. The bike was downtown Chicago in kind of a sketchy neighborhood. The address he gave me was an old abandoned paint manufacturer and I was getting more apprehensive the closer I got to it. Finally arriving I called the seller and he told me to pull around the one way street and he'd unlock the gate. I pulled in and he closed the gate behind me but I was relieved to see my bike waiting for me. I asked him to start it and he did, but he had to put it on a jump starter as the battery was dead. It ran pretty well! Really loud and I later found a big hole on the bottom of the left muffler. Other issues I have to address not particularly in this order:
  • God awful ape hanger bars.
  • The clutch and brake cables are really stiff and brittle. Will replace.
  • The throttle doesn't snap back to idle when you let it go. Probably also a cable.
  • Right side carb has no choke plate. Looking for a replacement.
  • Rebuild both carbs.
  • Charge the battery and evaluate the charging system.
« Last Edit: Jan 18, 2013, 13:04:17 by Dragonfish »
Hopefully everything doesn't end up horribly ironic.

thompsonmx100: just discussing cutstomer service calls for an amatuer bj service included with really expensive bar end mirrors

1971 CB350 Build

Offline cafecustom720

  • Posts: 109
Re: 1971 CB350 "Copperhead"
« Reply #1 on: Feb 13, 2012, 18:18:16 »
Nice looking bike for 500

Offline Dale

  • Posts: 680
    • [B]Moto Guzzi V50II Detailed Cafe Build Diary [/B]
Re: 1971 CB350 "Copperhead"
« Reply #2 on: Feb 14, 2012, 11:21:22 »
Great little bike. Looks clean.

To be honest I would just replace the battery. Get some carb cleaner and blast it in there and see if its easier to live with.

Offline Dragonfish

  • Posts: 222
  • Slightly Obnoxious
Re: 1971 CB350 "Copperhead"
« Reply #3 on: Feb 14, 2012, 11:24:19 »
Seller told me the battery was pratically new, he just let it run down. I'll toss it on the charger and if it doesn't take a charge well I'll replace it. Since it's missing the choke plate on the right side I'm going to have to rebuild it anyway once I find a replacement. Anyone have one lying around? Looks like the entire plate is missing.
Hopefully everything doesn't end up horribly ironic.

thompsonmx100: just discussing cutstomer service calls for an amatuer bj service included with really expensive bar end mirrors

1971 CB350 Build

Offline madmatt1

  • Posts: 350
Re: 1971 CB350 "Copperhead"
« Reply #4 on: Feb 14, 2012, 14:48:45 »
It's good to see you have a thread going already! However, I think she looks more like a cherry bomb
than a copperhead at this stage! I'm sure there's plenty of things in store I don't know about yet  ;D

One thing you'll want to have is a battery tender. They're cheap and  pretty much essential to own,
especially when the bike is gonna do some sitting. On any older bike, I always replace acid batteries with
sealed "maintenance-free" batteries. It's just a preference really, but they are safer and much easier to deal with.
The first time that the battery on my KZ overcharged and dripped acid all over my new chain, I said to hell with
them. (Lead acid batteries)
While I'm on THAT subject- The stator and / or regulator and / or rectifier are usual suspects on ANY
old bike. They are now 40 years old, and probably didn't work all that well when they were new. I found a high
output charging setup on ebay, that comes with a new stator, and solid state regulator / rectifier. It's about $200
or so, but that will modernize & boost your charging system, should you continue to have problems. Otherwise, the
battery tender is great for safely charging your battery back up on a regular basis.
As for the carb problem, check out ebay on that as well. You can find parts carburetors for our bikes all day long, and
they aren't expensive. We have a huge advantage here, by owning one of the most popular motorcycles ever built!
« Last Edit: Feb 14, 2012, 14:57:34 by madmatt1 »
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case

Offline Dragonfish

  • Posts: 222
  • Slightly Obnoxious
Re: 1971 CB350 "Copperhead"
« Reply #5 on: Feb 14, 2012, 14:51:16 »
Potentially stupid question:
I've seen several carbs on ebay listed as #2 or #3. I need the right carb for a twin. How do I know it's the correct one? I assume these came off a 4?
Hopefully everything doesn't end up horribly ironic.

thompsonmx100: just discussing cutstomer service calls for an amatuer bj service included with really expensive bar end mirrors

1971 CB350 Build

Offline madmatt1

  • Posts: 350
Re: 1971 CB350 "Copperhead"
« Reply #6 on: Feb 14, 2012, 15:08:25 »
You are correct, if it says #2 or #3, its going to be from a CB350F, or CB350/4, and will NOT interchange
with the twin. There is not much similarity between anything on these two bikes. The dead giveaway
on the 350 twin carbs is the big round chrome cover on the top, which covers the vacuum diaphragm. The 350F
carbs are mechanical, and have a much smaller cover on top, kind of an oblong cover.
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case

Offline Dragonfish

  • Posts: 222
  • Slightly Obnoxious
Re: 1971 CB350 "Copperhead"
« Reply #7 on: Feb 16, 2012, 00:06:30 »
I let the bike trickle charge overnight and when I got home from work gave it another shot. I kicked the living shit out of it and it won't fire. Interestingly, I hit the start button and I hear the solenoid "click" but the starter motor doesn't budge. I put a volt meter on the battery and it reads over 12v. When I'm kicking it, all I hear is what I can only describe as compression, not combustion. I know I'm getting fuel because there is some dripping out of the float drain. Is it possible the battery is shot even if it shows over 12v?
Okay, here's where I really show my noob colors. Let me just make sure I'm doing this right. Key in ignition, to the first click. I see neutral light and headlap light come on. If I move it to the second click the neutral light turns off. Second, kill switch set to On. Petcock straight down, looks like its set to On. Choke closed. Kick it. Am I missing something obvious?
Hopefully everything doesn't end up horribly ironic.

thompsonmx100: just discussing cutstomer service calls for an amatuer bj service included with really expensive bar end mirrors

1971 CB350 Build

Offline madmatt1

  • Posts: 350
Re: 1971 CB350 "Copperhead"
« Reply #8 on: Feb 16, 2012, 16:04:19 »
Sounds like you're doing it right... you want the neutral light on, and kill switch to be "on".

It's still possible that the battery is no good. After all, I believe you did say that the guy you bought it from
jump started it? He did use the electric start on the bike, correct?

Here are a couple links to a good site. He has good explanations for things you are not all that clear on.

http://www.dansmc.com/batteries.htm

http://www.dansmc.com/electric_starters.htm

I was going to give you a paragraph on starters, but lets start with the battery, and go from there.
If you have jumper cables, you can give it a go that way, if it works, obviously you aren't getting enough
power with the bike's battery.

« Last Edit: Feb 16, 2012, 16:14:33 by madmatt1 »
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case

Offline Dragonfish

  • Posts: 222
  • Slightly Obnoxious
Re: 1971 CB350 "Copperhead"
« Reply #9 on: Feb 16, 2012, 16:29:05 »
No, he kicked it. I tried to jump it off my car and that didn't help.
 
I'm going to spend some time tonight going over the basics. Check for spark, pull off the bowls and have a look at the carbs.
Thanks for the links! I'll read it on break at work :)
Hopefully everything doesn't end up horribly ironic.

thompsonmx100: just discussing cutstomer service calls for an amatuer bj service included with really expensive bar end mirrors

1971 CB350 Build