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post #1 of 22 (permalink) Old 06-09-2014, 01:50 AM Thread Starter
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Lifter Problems?

Has anyone heard of lifter problems on the newer model 103"S? I have a hollow knock noise coming from my 2013 RGU. It has a Screaming Eagle Hi Flow intake, Decatted head pipe with CFR slip ons and Andrews 57H cams. The noise didn't show up until after the cams were installed. I also have a Thundermax tuner. I have looked at the plugs and they look good as far as tuning goes. The noise is bothering me and is only audible from 2200 RPM to about 3000 Rpm. Any ideas would be helpful. I was told the 103's have poor quality lifters. Bike has 4000 miles on it.
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post #2 of 22 (permalink) Old 06-09-2014, 06:18 AM
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I would bring it back to the shop that did the install have them check it out.
The stock HD lifters are not so good.
But it sounds like it might not be adjusted right with pushrods.
If you are not sure bring it back asap...
Thanks FD



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Originally Posted by Cat Mech View Post
Has anyone heard of lifter problems on the newer model 103"S? I have a hollow knock noise coming from my 2013 RGU. It has a Screaming Eagle Hi Flow intake, Decatted head pipe with CFR slip ons and Andrews 57H cams. The noise didn't show up until after the cams were installed. I also have a Thundermax tuner. I have looked at the plugs and they look good as far as tuning goes. The noise is bothering me and is only audible from 2200 RPM to about 3000 Rpm. Any ideas would be helpful. I was told the 103's have poor quality lifters. Bike has 4000 miles on it.
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post #3 of 22 (permalink) Old 06-09-2014, 06:29 AM
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My lifters were replaced under warranty at 13K

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post #4 of 22 (permalink) Old 06-09-2014, 06:58 AM
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If it has adjustable pushrods I would attempt to readjust them as a first step but don't get your hopes up with the stock lifters. A premium lifter like S&S, Gaterman, Woods will go a long way to solving your tapping.


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post #5 of 22 (permalink) Old 06-09-2014, 09:17 AM
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that hollow knock could be the tapping noise from your throttle body. mines the same way. had a SE heavy breather and switched to roland sands breather. same cams and thundermax. I notice it from about 2300 to 3000. once over 3000 its gone like clockwork. did some reading about it and found that the TBW bikes make this noise because of the pulses the throttle body makes at that rpm. could also be combined with valve noise being amplified through the throttle body. ive had lots of Harleys over the years and I have found that lifter noise is a little different. more of a tick. if its the loud hollow knock sound your hearing I believe its the same as mine. ive chased it down with stethoscope and in pretty sure its coming from the throttle body area, not lifters. that's just my opinion.
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post #6 of 22 (permalink) Old 06-09-2014, 10:31 AM
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Originally Posted by waynemags View Post
that hollow knock could be the tapping noise from your throttle body. mines the same way. had a SE heavy breather and switched to roland sands breather. same cams and thundermax. I notice it from about 2300 to 3000. once over 3000 its gone like clockwork. did some reading about it and found that the TBW bikes make this noise because of the pulses the throttle body makes at that rpm. could also be combined with valve noise being amplified through the throttle body. ive had lots of Harleys over the years and I have found that lifter noise is a little different. more of a tick. if its the loud hollow knock sound your hearing I believe its the same as mine. ive chased it down with stethoscope and in pretty sure its coming from the throttle body area, not lifters. that's just my opinion.


+1 on that...... it's especially loud if you have a stage 1 intake and the football cover. The sound reflects off the cover and makes it sound like it's coming out of the left side.








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post #7 of 22 (permalink) Old 06-09-2014, 11:19 AM Thread Starter
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Waynemags and PGR that sounds just like what it's doing. I will try another intake.
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post #8 of 22 (permalink) Old 06-09-2014, 11:33 AM
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The TB on these bikes are loud and the heavy breather is like a megaphone going right to the intake valves.
From what I understand the "C" lifters (made in mexico) in the newer bikes are not that reliable and upgrading is desireable. My bike came with the "B" lifters and they are still good but I swapped them out and I put in the SE lifters (made in USA by Jims) in my bike and I haven't had any problems as of yet, I still have my "B" lifters as a back up.
A aftermarket cam will cause a bit more noise coming out of the TB depending on how steep the ramps are on the cam, steeper ramps on the cam will cause the valves to snap shut faster.


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post #9 of 22 (permalink) Old 06-09-2014, 11:59 AM
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Originally Posted by Cat Mech View Post
Waynemags and PGR that sounds just like what it's doing. I will try another intake.
I don't think another intake will help. mine still does it. as much as I hate to hear"thats normal," it might be nature of the beast with these Twincams. especially with higher lift cams and more valve noise and these throttle bodies. ive actually taken my throttle body apart thinking that bushings are worn and all was good.
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post #10 of 22 (permalink) Old 06-09-2014, 12:12 PM
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I installed 527 cams and get the same noise. I was told the rockers and rocker box have to much side play. 2014 bikes have tighter spec
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