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  #41  
Old 29th May 2019
Tomcatt Tomcatt is offline
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I was surprised how quiet the valve train on mine was stock and it still is with the .551's. I was expecting clatter with the .551's but there isn't any. Beats me why. Maybe the QC of the lifters has improved? Mine's a '17.
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  #42  
Old 29th May 2019
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Could just be a tolerance thing. You got some combination of things that left it nice and quiet, while most didn't? Maybe the 551s are just really bad at handling the normal tolerance ranges and only like certain numbers. Seems weird that that grind is one of the only ones people report being obnoxiously noisy on a regular basis, but I wouldn't put it past a HD part to have weird tolerance related issues.
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  #43  
Old 29th May 2019
Tomcatt Tomcatt is offline
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I doubt I found a "magic" combination that doesn't clatter. I can believe Harley is getting lifters from a different source. The oft repeated comments about .551's clattering are pretty dated. This is the internet where such things get repeated and repeated and repeated...
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  #44  
Old 29th May 2019
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Originally Posted by Tomcatt View Post
I doubt I found a "magic" combination that doesn't clatter. I can believe Harley is getting lifters from a different source. The oft repeated comments about .551's clattering are pretty dated. This is the internet where such things get repeated and repeated and repeated...
They were pretty widespread back then, the noise complaints, and you dont hear much because honestly until now I haven't heard much of anything about anyone new running them with all the other options available today.
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HSR42 25 pilot 2 turns Y8 needle jet 97 needle 2nd groove 170 main
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Max torque 87.7@4400rpm/max hp 86.8@5600rpm




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  #45  
Old 16th June 2019
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EL in NH EL in NH is offline
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I run the 551 cam.. 2010 xl1200 .. some head work.. ..damned if I can hear any unusual valve clatter..
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  #46  
Old 16th June 2019
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Considerable amount of money to go nowhere. Should've kept the W cams.
Stock stage 1 1200, stock W cams with CS slip ons max torque 78 max power 84.
With the Patriot Defender max torque 77 max power 87.
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Originally Posted by 60Gunner View Post
Considerable amount of money to go nowhere. Should've kept the W cams.
Stock stage 1 1200, stock W cams with CS slip ons max torque 78 max power 84.
With the Patriot Defender max torque 77 max power 87.
yeah sure
It's a lot faster than with the stock cams...
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  #48  
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Way faster? You lost torque and gained a couple HP. And not from the cams!
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  #49  
Old 17th June 2019
Tomcatt Tomcatt is offline
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Quote:
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Way faster? You lost torque and gained a couple HP. And not from the cams!
You're now our internet expert? I don't see you posting any actual results for your "better" choice.
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  #50  
Old 18th June 2019
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Quote:
Originally Posted by EL in NH View Post
I run the 551 cam.. 2010 xl1200 .. some head work..damned if I can hear any unusual valve clatter..
Guess that means we're both deaf 'cause the internet says they clatter, or clattered...

What exhaust and tuner are you running? Your AFR walks around quite a bit and goes very lean at high rpms.
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