Author Topic: CB350F right side exhust smoking?  (Read 1107 times)

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Offline JerryRice

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CB350F right side exhust smoking?
« on: July 27, 2008, 12:28:41 AM »
Hello, I recently bought a CB350F. The right side exhust smokes a little bit. Burning oil.
What can cause this? I am going to be fixing a head gasket leak this week and would love
to be able to fix the smoke if it is an easy job.

Any help/advice would be appreciated.

Thanks .
The Real JERRY RICE
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Offline JerryRice

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Re: CB350F right side exhust smoking?
« Reply #1 on: July 27, 2008, 03:44:31 PM »
Does anyone have any ideas?
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Offline bender01

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Re: CB350F right side exhust smoking?
« Reply #2 on: July 27, 2008, 03:55:03 PM »
Is it an original exhaust? Or a 4 into 2? If 4>2 that would make it cylinder 3or4. Is it black smoke?
75 550 K1
74 750 K4
1968 450 K1 Super Sport
74 750k 836 project
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So, the strategy is to lie to people you are asking for help?

I think I'll be busy going for a ride.

Good luck!
Two Tired Quote !

Offline JerryRice

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Re: CB350F right side exhust smoking?
« Reply #3 on: July 27, 2008, 08:31:08 PM »
It's 2 into one on each side. The smoke is black.
The Real JERRY RICE
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My Dream Bike
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Offline bender01

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Re: CB350F right side exhust smoking?
« Reply #4 on: July 28, 2008, 06:14:45 AM »
Check the plugs for carbon buildup. Have you cleaned the carbs yet?
75 550 K1
74 750 K4
1968 450 K1 Super Sport
74 750k 836 project
http://www.bikepics.com/members/bender01/
So, the strategy is to lie to people you are asking for help?

I think I'll be busy going for a ride.

Good luck!
Two Tired Quote !

Offline JerryRice

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Re: CB350F right side exhust smoking?
« Reply #5 on: July 28, 2008, 08:16:26 PM »
I will check them in a few days when I do the head gasket.
- I havent even inspected the plugs yet.

Thanks,
Jack
The Real JERRY RICE
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My Dream Bike
www.CB350F.com

Offline schneider419

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Re: CB350F right side exhust smoking?
« Reply #6 on: July 30, 2008, 01:39:49 PM »
cylinder running rich? or bad valve seals?

Offline Loudpipe

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Re: CB350F right side exhust smoking?
« Reply #7 on: July 30, 2008, 04:15:51 PM »
If the smoke is black it's not oil.  Oil smoke is bluish color.  If the smoke is black, you're probably running rich and could use to lean out whatever cylinders are smoking.  Pull the plugs and see if they're black.
- LP

1974 Honda CB350F

Previous: 1978 Honda CB750F, 1971 Honda CB500K, 2009 Yamaha YZF-R1

Offline JerryRice

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Re: CB350F right side exhust smoking?
« Reply #8 on: August 06, 2008, 09:01:40 PM »
I pulled the plugs and took a pic:



What do you think is going on with the engine?
The Real JERRY RICE
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Offline JerryRice

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Re: CB350F right side exhust smoking?
« Reply #9 on: August 07, 2008, 01:31:25 PM »
Any readings on these bad boys?
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My Dream Bike
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Offline heffay

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Re: CB350F right side exhust smoking?
« Reply #10 on: August 07, 2008, 02:12:28 PM »
yes, number 4 looks like your culprit.
clean the plugs.
make sure you've got spark... although, it doesn't look wet now.
check for smoke.
may need to mess w/ your carb settings... 4 looks rich, 2 and 3 maybe on the lean side, 1 looks decent.
you've got the plugs out, you could just go for new.   ;)
Today: '73 cb350f, '96 Ducati 900 Supersport
Past Rides: '72 tc125, '94 cbr600f2, '76 rd400, '89 ex500, '93 KTM-125exc, '92 zx7r, '93 Banshee, '83 ATC250R, 77/75 cb400f

Offline JerryRice

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Re: CB350F right side exhust smoking?
« Reply #11 on: August 07, 2008, 05:53:25 PM »
Put in new plugs. How long should I ride before checking them?
The Real JERRY RICE
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My Dream Bike
www.CB350F.com

Offline loonymoon

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Re: CB350F right side exhust smoking?
« Reply #12 on: August 07, 2008, 06:04:42 PM »
I used to get smoke from cylinder 3. We thought it was sticking rings. Treatment with a fuel additive and /or an eletronic ignition seems to have cured it.. not too sure which!