Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

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Old Mar 27, 2022 | 08:55 AM
  #21  
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As bad as those plugs looked, I'm still thinking fuel. And I was assuming it wasn't getting enough of it on cold start.


However, it can get too much.
 
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Old Mar 27, 2022 | 09:04 AM
  #22  
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Originally Posted by PLANET HARLEY
yes i tested the fuel
At the carb? You see the initial squirt when you turn the throttle? As Rip stated plugs show build up from non burn, they should be a dry cream color. Appears to be flooding to me, but I'm not there. Carb rebuild is cheap and easy. Also just me, I replace vacuum petcocks with non-vacuum types.
 

Last edited by TSheff; Mar 27, 2022 at 09:28 AM.
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Old Mar 27, 2022 | 09:11 AM
  #23  
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maybe a mixture screw adjustment?

 
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Old Mar 27, 2022 | 09:25 AM
  #24  
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This sou;da very strange…especially if it is repeatable. If it is repeatable..,then I’d suspect some kind of weird electrical issue.
 
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Old Mar 27, 2022 | 09:27 AM
  #25  
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Another vote for fuel delivery problem (or owner method) at startup and suspect bad petcock.
 
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Old Mar 28, 2022 | 11:36 AM
  #26  
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I test tomorrow

 
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Old Mar 28, 2022 | 11:52 AM
  #27  
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Pull your vacuum hose off the petcock and make sure no fuel is in it. Its best to check the vacuum with a hand vacuum pump.

But in a pinch, put a hose on it and suck till it holds your tongue. It can actually work with a small leak. But if it leaks, it will pull excess raw fuel into engine

Not sure when but late model Carburetor Harleys have a dual diaphragm system like most metrics.

I would check it. You really need to leave that safety feature on there. Especially old Harleys with leaky float seats.
 
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Old Mar 28, 2022 | 01:19 PM
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Old Mar 28, 2022 | 11:08 PM
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Judging by those plugs it's way too rich, wouldn't take much to flood it that way. That's serious soot fouling and the gaps looks a bit big, what are they running ?
 
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Old Mar 29, 2022 | 04:33 AM
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Originally Posted by PLANET HARLEY
​​​​​​You need to respond in your attachments. Is that fuel? Where is it coming from?
 
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