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Motor noise

Discussion in 'General' started by John Cingel, Jun 1, 2017.

  1. John Cingel

    John Cingel Member

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    Just looking do an opinion on this noise. Thanks
     
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  2. JR03CHOPPER

    JR03CHOPPER Well-Known Member
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    Its hard to tell through the video, but maybe a broken lifter or valve?
     
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  3. BWG56

    BWG56 Guru

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    X2
     
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  4. Fat_Bastard

    Fat_Bastard Active Member

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    Agree with above posts but also you may consider:

    cannot be certain... (Sometimes cracked valve spring; compression test to find.)

    Don't know the 2008 Big Dog primary (have the 2004 "harley" primary on mine)
    but yours sounds something like this; but different perhaps because different Big Dog primary setup...

    This video enabled me to diagnose the noise and eventually fix it. -- was a loose Compensator Nut. Compensator noise changes slightly when clutch in and go from neutral to gear and back with out reving motor.

    Reving motor: in gear, or neutral, or riding does it change the noise?
    Also try to stick end of screw driver at suspected area and listen to handle like a
    "stethescope" (no bullshit) to further isolate source area of noise.

     
    #4 Fat_Bastard, Jun 1, 2017
    Last edited: Jun 1, 2017
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  5. bdm7250

    bdm7250 Guru
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    Rear cylinder exhaust leak? My hearing is about as bad as my sight tho..
     
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  6. dentdude36

    dentdude36 Guru

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    :oldcrazy: What??? No glasses on ya can't hear:oldhardlaugh:or see:oldhardlaugh:
     
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  7. bdm7250

    bdm7250 Guru
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    Huh?... IMG_5561.GIF
     
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  8. Th3InfamousI

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    Hearing is that bad? That is loud, not an exhaust leak.



    How's your oil pressure? Do you have a manual gauge on it?





    Sent from my 2PS64 using Tapatalk
     
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  9. Big D Florida

    Big D Florida Well-Known Member
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    Agree with Paul, hard to tell from the video. Diagnostics from the audio would be hit or miss.
    Try to isolate it, internal/external, top-end/low-end, etc.
     
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  10. bigkelk9

    bigkelk9 Well-Known Member
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    Yeah that's horrible.. i'd check ur lifters.. sounds almost like one may have collapsed
     
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  11. Mr. Wright

    Mr. Wright Guru
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    Start with the simple things first. A blown or loose compression release, with make a lot of noise too.
     
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  12. Srodden

    Srodden Well-Known Member

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    Pull the primary cover check the easy stuff clutch hub nut or compensator loose.
     
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  13. bdm7250

    bdm7250 Guru
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    Maybe...don't you have a bike on the lift to work on..:willynilly:. :oldlaugh:
     
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  14. John Cingel

    John Cingel Member

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    Noise isn't there when I first start it up. It starts once warm. Seems to be coming from the very top on the spark plug side. Listened with a screw driver that all sounds smooth. Its more of a ticking or pinging. I don't have a oil pressure gauge but the idle is high enough .
     
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  15. woodbutcher

    woodbutcher Mr. Old Fart member #145
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    remove the gas cap and check to see if the vent tube down in the hole is still in place or maybe broken off.

    been a lot of people chased their tails trying to find a noise and it just be the tank vent tube.
     
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  16. ground pounder

    ground pounder Active Member

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    Did you check your compression relief valves? maybe one is coming apart!
     
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  17. bigglenn

    bigglenn Member

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    Did you ever figure out what the noise was? I have a similar issue with my 08 K9.
     
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  18. Five Five

    Five Five Well-Known Member
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    its not the lower end...I'm going to go with top end as valve train noise, you may have a bad lifter...
     
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  19. sixpack

    sixpack Member
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    John, I have the exact same noise issue on one of my Dogs. Had the motor rebuilt by S&S and got this issue with the rebuild. S&S has sent me to 3 shops, lifters changed 3 times, same noise. No noise until engine warms up. Pretty frustrating. Let me know if you resolve it. I will do the same.
     
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  20. Marky-Marc

    Marky-Marc Well-Known Member

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    @John Cingel - start with a simple pushrod adjustment and go from there, but the 'stethoscope' trick is your best bet to isolate the noise - screwdriver works fine or harbor freight has an engine one for under $10

    @sixpack - If everything has been done, and the noise continues, check the rocker arm shafts/bushings in the rocker boxes - these sometimes wear out due to heat in both TP Rocker boxes and S&S Rocker boxes and that failure will sound like A ticking as well....
     
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