EVO All Evo Model Discussion

1999 fxstc

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Old Mar 18, 2019 | 06:49 PM
  #21  
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I pulled the plugs, it definitely has spark. And the plugs are definitely very fouled. Real dark black. I cleaned them and it started. Same crap that was going on in the fall plugs were fouling and I had the carb off 20 times, cleaned it and made sure everything was as it should be. Something is causing the plugs to foul. When they foul would that cause the bike to sputter and buck?
 
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Old Mar 18, 2019 | 06:52 PM
  #22  
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Originally Posted by RapidRoy99
I pulled the plugs, it definitely has spark. And the plugs are definitely very fouled. Real dark black. I cleaned them and it started. Same crap that was going on in the fall plugs were fouling and I had the carb off 20 times, cleaned it and made sure everything was as it should be. Something is causing the plugs to foul. When they foul would that cause the bike to sputter and buck?
Yes..
Time to check your carb jets and adjustments.
 
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Old Mar 18, 2019 | 06:57 PM
  #23  
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Originally Posted by Tom84FXST
Backfiring out the carb is usually a vacuum leak...spray some carb cleaner in the intake manifold while it is running and see if it changes the idle
Originally Posted by grbrown
So do the suggested test, to confirm if they are OK!
I'm with the vacuum and intake leak crowd.
Did you have this issue before you changed ALL 3??
 
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Old Mar 18, 2019 | 06:59 PM
  #24  
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Originally Posted by texashillcountry
Yes..
Time to check your carb jets and adjustments.
I don't know what else to do with it, I've had it off so many times. Adjusted everything, double checked float level/angle and made sure it was spotless.
 
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Old Mar 19, 2019 | 07:02 AM
  #25  
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Originally Posted by RapidRoy99
. Something is causing the plugs to foul.
If you have a vacuum leak...the stock carb will go full rich because of the diaphragm...
 
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Old Mar 19, 2019 | 08:13 AM
  #26  
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My son's Ninja was acting up, we rebuilt the carbs a few times, finally gave up and bought a set off ebay. Cleaned them up and then the bike ran great. Sometimes it is a minute speck of dirt in the wrong place. A leaky seal, etc.... Crack?......

We chased it for 2 weeks.
 
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Old Mar 19, 2019 | 03:22 PM
  #27  
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Check this out, https://www.v-twin forum.com/forums/evolution-engine/68163-fouling-plugs-running-out-ideas-2.html

I think this may be something to consider. For 30 dollars or so I'll just buy a cable to replace the old one that I've probably been using way too much since I've bought the bike last summer.
 
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Old Mar 19, 2019 | 03:39 PM
  #28  
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Carb problem. Too lean. CV Carb? Busted diaphragm in the VOES switch?
 
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