Bad Vibes
Cruiser
Joined: Jul 2011
Posts: 109
Likes: 1
From: louisiana
All DYNA's are not the same . Mine's a 5-speed & its pretty smooth up to about 45 in 5th gear but from 46 up to 50 damn thing vibrates the hell out of my hands and feet . Pretty smooth from there on up . Its just the nature of the beast . Have no idea what RPM because friggin MOCO decided my motorcycle didn't need a tachometer . That's the real reason they came out with the six speed .(VIBRATION CLAIMS) !
Road Warrior
Joined: May 2005
Posts: 1,301
Likes: 24
From: Minden LA
[QUOTE=TinCupChalice;14355329]
This is an interesting read on RPM: https://www.reddit.com/r/Harley/comm...w_lugging_your
I'm going to agree with what others have already posted, 50 MPH in 6th is way too low. During group rides I'm in 5th gear since we seem to run around 62 MPH as a group but I fully know I'm rev-matching down to 4th if I need any sort of acceleration. When the bike is fully warmed twist that girl up in the RPM's a bit, when I ride alone I like to keep the cruising RPM's 2600-3200, you'll notice no real change in MPG. I tend to upshift between 3500-4000 RPM...
I have an 02 5 speed and it didn't like 62 mph. It had a vibe that was annoying. It was a harmonic thing because 2 mph up or down, it didn't do it. When I went to the 95" and cams, and went up 2 teeth on the front sprocket, no more vibes at any speed below about 100, and they all start buzzing when the rpms get way up there. And it now has 119k on it and still runs great. It was a pita because we always seemed to run about 62 on surface roads posted 55-- now, I'm a happy camper!
This is an interesting read on RPM: https://www.reddit.com/r/Harley/comm...w_lugging_your
I'm going to agree with what others have already posted, 50 MPH in 6th is way too low. During group rides I'm in 5th gear since we seem to run around 62 MPH as a group but I fully know I'm rev-matching down to 4th if I need any sort of acceleration. When the bike is fully warmed twist that girl up in the RPM's a bit, when I ride alone I like to keep the cruising RPM's 2600-3200, you'll notice no real change in MPG. I tend to upshift between 3500-4000 RPM...
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
"Lugging" is kind of an archaic term, which had its place back in the days when a combination of low rpms and high throttle opening was likely to result in detonation.
With modern engine controls which include detonation sensors and maps which can richen the mixture and pull a bunch of timing under high loads at low rpms, the term doesn't have much meaning anymore.
It was the detonation which put destructive loads on parts, not the low rpms. Recent automatic transmissions will often have cars running down the freeway at about 1500 rpm. And recent manual transmission Corvettes have come with a "skip-shift" feature, which will force you to shift directly from first to fourth when pulling away from a stop under certain conditions, leaving you accelerating in fourth at about 1000 rpm.
About the only parts that used to suffer from low rpm operation were flat-tappet camshafts. High camshaft wear used to be common on taxi engines which were idled a lot. And a lot of you probably remember the careful breakin routine which had to be used on flat-tappet performance camshafts, or you could do major damage within the first half-hour of operation.
But these things don't really apply anymore, because most of these pushrod engines now have roller lifters, and so do our Harleys.
Last edited by Warp Factor; Sep 6, 2015 at 06:10 AM.
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