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Author Topic: CB350 Popping on deacceleration  (Read 716 times)

Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #15 on: Jun 18, 2017, 18:57:50 »
Doe it look to be running lean from the spark plug? I just don't know which area of the throttle position I need to make rich as it runs from idle to full throttle really good.


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Online irk miller

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Re: CB350 Popping on deacceleration
« Reply #16 on: Jun 18, 2017, 22:37:38 »
5 degrees of advance is 10 - 15° of plug temp.  I'd consider your timing being too advanced as well.  One adjustment at a time, but I'd try dialing the timing back for some runs before I dug into the carbs.  Then go back to carbs.  You're definitely dealing with unburnt fuel in igniting in your exhaust, but why is a question.  I'm inclined to think it's your timing.

Offline teazer

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Re: CB350 Popping on deacceleration
« Reply #17 on: Jun 19, 2017, 01:49:11 »
Retarded timing would cause that. 

It's hard to see that plug, but it looks like the ground strap has just about the right amount burned clean and that's odd.  What temperature range is the plug? And what is stock?

Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #18 on: Jun 20, 2017, 00:53:25 »
Teazer: Retard timing would cause overheating? Dumb question but retard is what? Advancing the timing?


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Offline plyzo

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  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #19 on: Jun 20, 2017, 00:54:08 »
Running stock plugs NGK B8ES


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Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #20 on: Jun 20, 2017, 01:10:58 »
How high should I be getting the RPM's when setting full advance timing?


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Offline Tim

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Re: CB350 Popping on deacceleration
« Reply #21 on: Jun 20, 2017, 01:15:21 »
Full advance is reached at 2-3K RPM I think.  You don't need much.
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Offline Ryan Stecken

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Re: CB350 Popping on deacceleration
« Reply #22 on: Jun 22, 2017, 14:01:29 »
Watching this.

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Offline julian.allard66

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Re: CB350 Popping on deacceleration
« Reply #23 on: Jun 22, 2017, 17:09:44 »
Teazer: Retard timing would cause overheating? Dumb question but retard is what? Advancing the timing?


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Both over advanced and over retarded ignition cause over heating, different types of over heating, your ignition timing has to be correct to within a few degrees.

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Offline teazer

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Re: CB350 Popping on deacceleration
« Reply #24 on: Jun 22, 2017, 17:35:20 »
Absolutely correct, but only one creates popping with unburned fuel in the exhaust ( as a rule).  Good point that advanced timing is likely to generate higher cylinder head temps and retarded gives higher exhaust temps. 

Offline plyzo

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  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #25 on: Jun 22, 2017, 17:55:08 »
Thanks guys for the info. Will check timing again at full advance and see if it's off.


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