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whats this part

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Old Jul 2, 2012 | 12:13 AM
  #1  
optima23's Avatar
optima23
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Default whats this part

Hello,

I just bought this 05 sportster and I dont know what the part below the spark plug is. On one cylinder it has a black cap and on the other it is broken. Can anyone tell me what the part is and if it matters?
 
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Old Jul 2, 2012 | 12:25 AM
  #2  
Ironman 883's Avatar
Ironman 883
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From: DuBois, PA
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Direct NOS injection?
Just a guess
 
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Old Jul 2, 2012 | 05:09 AM
  #3  
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JonFMJ
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Is it a button? It's hard to tell since I'm on my phone but if it's got head work cams and high compression pistons it could be a pressure relief valve
 
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Old Jul 2, 2012 | 06:42 AM
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compression release. They are used for starting. Push them down before starting if the motor has high compression the starter will thank you. Since you dont know what they are I take it you dont use them? How does the bike start without them? Any hot start issues?
 

Last edited by Mike07FLHTC; Jul 2, 2012 at 06:47 AM.
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Old Jul 2, 2012 | 07:17 AM
  #5  
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optima23
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I just bought the bike and am still assembling it and was told it does have motor work done. Cant start the bike yet. The picture i posted still has the black button which you can push down or pull up. The other cylinder the black part is broken. Who would I talk to with to try and order a new one?
 
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Old Jul 2, 2012 | 07:42 AM
  #6  
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Need Coffee.........
 

Last edited by xFreebirdx; Jul 2, 2012 at 07:49 AM.
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Old Jul 2, 2012 | 07:43 AM
  #7  
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Mike07FLHTC
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I see. You can get them from a dealer but they are not cheap. Some of them have replacable caps maybe you can just replace the cap. They are made with differant size threaded ends so I remove it check the threads and try jirehcycles.com thats where I got mine cheap.BTW the broken cap will not keep it from working just wear gloves they get very hot.
 
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