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Author Topic: CB350 Popping on deacceleration  (Read 1021 times)

Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #10 on: Jun 17, 2017, 23:59:58 »
Thanks guys, will check again and see how fit the joints are in the exhaust


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Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #11 on: Jun 18, 2017, 01:14:55 »
After a 30 minute ride the bike temperature from the cylinder heads is about 300 degrees. Is this bike running to hot or is that a normal temperature?


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Offline teazer

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Re: CB350 Popping on deacceleration
« Reply #12 on: Jun 18, 2017, 01:18:28 »
That's pretty hot.  How are the plugs and where is the ignition set?

Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #13 on: Jun 18, 2017, 01:22:01 »
Here is a pick of the spark plug after the ride.




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Offline plyzo

  • Posts: 230
  • 1970 Honda CL 350
    • Plyzo Studios
Re: CB350 Popping on deacceleration
« Reply #14 on: Jun 18, 2017, 01:22:40 »
Running Pamco V2 ignition with full advance between the marks.


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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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Offline 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

  • Posts: 230
  • 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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