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techtalk:ref:genmsr05 [2024/01/17 21:17] – hippysmacktechtalk:ref:genmsr05 [2025/07/31 02:06] (current) – [Heads] hippysmack
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 **Condition**: \\ **Condition**: \\
 Head gasket leak. \\ Head gasket leak. \\
-You can feel around the heads for air leaks while the engine is running. \\ +You can feel around the heads for air leaks while the engine is running. You can also perform a leak down or compression test on the cylinders. Or you can use a stethoscope or rubber hose to listen for air leaks around the gaskets. \\
-You can also perform a leak down or compression test on the cylinders. \\ +
-Or you can use a stethoscope or rubber hose to listen for air leaks around the gaskets. \\+
  
 **Symptom**: \\ **Symptom**: \\
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 Loose head bolt. \\ Loose head bolt. \\
  
 +**Symptom**: \\
 +A muffed bumping noise (1991-up models). \\
 +
 +**Condition**: \\
 +Loose or missing head breather bolt(s). ((hogluvr of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/4966145-bought-a-bike-have-a-problem#post4966169)) \\
 +The sound is 1:1 with engine speed (each time the pistons go down). It may sound and feel like the pistons are bumping into something but there will be no metal to metal contact noise. This can happen if a head breather bolt backs out while riding or if the bolt(s) have been removed. This will also alter engine breathing and could result in puking oil out the heads. \\
 +
 +|Video: Bumping noise on 1991 Sportster \\ from missing head breather bolts ((hogluvr of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/4966145-bought-a-bike-have-a-problem#post4966169))  |
 +|{{ :video:100-noise_bumping_sound_missing_1991_breather_bolts_360p_by_hogluvr.mp4 |}}|
 ===== Pistons ===== ===== Pistons =====
 **Symptoms**: \\ **Symptoms**: \\
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 |  Short video (L) and Pics of a 2000 Sportster with rear piston hitting the head. ((video and photos courtesy of groovemeisterus of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/202540-reasons-why-new-piston-rings-would-seize-in-fresh-rebuild/page5?t=2079724&page=5))  ||| |  Short video (L) and Pics of a 2000 Sportster with rear piston hitting the head. ((video and photos courtesy of groovemeisterus of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/202540-reasons-why-new-piston-rings-would-seize-in-fresh-rebuild/page5?t=2079724&page=5))  |||
-|{{:video:piston_slap_on_2000_sportster_by_groovemeisterus.mp4|}}| {{:techtalk:ref:genmsr:piston_slap_-_piston_to_head_contact_pic1_by_groovemeisterus.jpg?direct&280|}}| {{:techtalk:ref:genmsr:piston_slap_-_piston_to_head_contact_pic2_by_groovemeisterus.jpg?direct&280|}}|+|{{video:100-noise_piston_slap_on_2000_sportster_by_groovemeisterus.mp4|}}| {{:techtalk:ref:genmsr:piston_slap_-_piston_to_head_contact_pic1_by_groovemeisterus.jpg?direct&280|}}| {{:techtalk:ref:genmsr:piston_slap_-_piston_to_head_contact_pic2_by_groovemeisterus.jpg?direct&280|}}|
  
 |  Light witness marks from piston contact with valve. ((photos by BlackBikeDave of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/174956-loud-clanking-on-startup/page4?t=1877254&highlight=noises&page=4))  ||| |  Light witness marks from piston contact with valve. ((photos by BlackBikeDave of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/174956-loud-clanking-on-startup/page4?t=1877254&highlight=noises&page=4))  |||
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 The (R) video is a bearing test as described by XLForum member "wedge" and performed by XLForum member "onadraw". \\ The (R) video is a bearing test as described by XLForum member "wedge" and performed by XLForum member "onadraw". \\
 |  Video: Lower front rod bearing failure ((video by onadraw of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/204579-metal-in-oil-filter/page4#post4603671))  |  Video: The "Wedge Test" for bearing failure. ((video by onadraw of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/204579-metal-in-oil-filter/page4#post4603671))  | |  Video: Lower front rod bearing failure ((video by onadraw of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/204579-metal-in-oil-filter/page4#post4603671))  |  Video: The "Wedge Test" for bearing failure. ((video by onadraw of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/204579-metal-in-oil-filter/page4#post4603671))  |
-|{{ :video:connecting_rod_noise_-_rapping_lower_front_rod_by_onadraw.mp4 |}}|{{ :video:connecting_rod_noise_-_testing_lower_rod_bearings_by_onadraw.mp4 |}}|+|{{ video:100-noise_lower_front_connecting_rod_rapping_by_onadraw.mp4 |}}|{{ video:100-noise_lower_rod_bearing_test_by_onadraw.mp4 |}}|
 \\ \\
  
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   * **Symptom: Rattling Noise**. \\ Conv90 submitted video of noise from the primary side: \\   * **Symptom: Rattling Noise**. \\ Conv90 submitted video of noise from the primary side: \\
-{{:video:buell_noise_video_by_conv90.mp4|}}+{{video:100-noise_on_buell_by_conv90.mp4|}}
  
   * **Symptom: Rattling Noise**. \\ The tensioner shoe can be loose and rock side to side enough to sound like a lifter problem. It will rock fore and aft into the primary cover. \\ From the cam side of the bike, it'll sound like it's a lifter bouncing around. It's a slow intermittent hollow banging noise. It may only make noise at idle when the chain is least tight. \\   * **Symptom: Rattling Noise**. \\ The tensioner shoe can be loose and rock side to side enough to sound like a lifter problem. It will rock fore and aft into the primary cover. \\ From the cam side of the bike, it'll sound like it's a lifter bouncing around. It's a slow intermittent hollow banging noise. It may only make noise at idle when the chain is least tight. \\
     * **Condition: Loose Primary Chain Adjuster Shoe**. \\ Below is a short video by Conv90 of the XLFORUM showing the hollow noise created.     * **Condition: Loose Primary Chain Adjuster Shoe**. \\ Below is a short video by Conv90 of the XLFORUM showing the hollow noise created.
  
-{{:video:primary_chain_adjuster_shoe_noise_by_conv90.mp4|}}+{{video:100-noise_primary_chain_adjuster_shoe_by_conv90.mp4|}}
  
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