Vibrations increase when hot
Thread Starter
|
Stage III
Joined: Apr 2020
Posts: 3
Likes: 0
From: Norway
Vibrations increase when hot
Hi
i have a 2001 Dyna with a 106 Stroker kit from S&S on it.
the engine goes well, and when I start driving I feel the vibrations are not that bad. But when I have been driving 20+ minutes, I feel like the bike gets more vibrations. If I pull the clutch and just roll, the vibrations goes away, so it would seem engine related. The vibrations are most prominent at low to medium rpm, and smother after passing 60 mph. I have changed the front mount, I have a BigBear performance rear engine mount.
any ideas what the issue could be??
i have a 2001 Dyna with a 106 Stroker kit from S&S on it.
the engine goes well, and when I start driving I feel the vibrations are not that bad. But when I have been driving 20+ minutes, I feel like the bike gets more vibrations. If I pull the clutch and just roll, the vibrations goes away, so it would seem engine related. The vibrations are most prominent at low to medium rpm, and smother after passing 60 mph. I have changed the front mount, I have a BigBear performance rear engine mount.
any ideas what the issue could be??
Club Member
Joined: Dec 2014
Posts: 10,734
Likes: 3,755
From: SWFL
Welcome to the forum.
When did you notice the vibrations first? After installing motor kit? After rear motor mount? Who installed mount? Stock (HD) front mount? Condition? (assume good since you changed) Top link alignment? Motor aligned?
There's a process where motor mount bolts are loosened (not removed) and bike is confirmed exactly upright, then motor it idled in neutral for a minute, shut down then mounts tightened to spec. Has that been tried?
Edit: Also check that exhaust isn't contacting case or frame?
When did you notice the vibrations first? After installing motor kit? After rear motor mount? Who installed mount? Stock (HD) front mount? Condition? (assume good since you changed) Top link alignment? Motor aligned?
There's a process where motor mount bolts are loosened (not removed) and bike is confirmed exactly upright, then motor it idled in neutral for a minute, shut down then mounts tightened to spec. Has that been tried?
Edit: Also check that exhaust isn't contacting case or frame?
Last edited by Mchad; Aug 8, 2022 at 11:44 AM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,900
Likes: 8,007
From: poway
Besides the loose motor bolts settling trick, you can try and install a 1/16 to 1/8 inch spacer under the front mount to see if it helps. My DX has always had some RPM where it vibrates more. I tend to keep out of that RPM range. It has varied from about 2200 to 2800 rpm depending on how the motor was built and the exhaust system used... In my case even the air cleaner made a difference..
Thread Starter
|
Stage III
Joined: Apr 2020
Posts: 3
Likes: 0
From: Norway
Welcome to the forum.
When did you notice the vibrations first? After installing motor kit? After rear motor mount? Who installed mount? Stock (HD) front mount? Condition? (assume good since you changed) Top link alignment? Motor aligned?
There's a process where motor mount bolts are loosened (not removed) and bike is confirmed exactly upright, then motor it idled in neutral for a minute, shut down then mounts tightened to spec. Has that been tried?
Edit: Also check that exhaust isn't contacting case or frame?
When did you notice the vibrations first? After installing motor kit? After rear motor mount? Who installed mount? Stock (HD) front mount? Condition? (assume good since you changed) Top link alignment? Motor aligned?
There's a process where motor mount bolts are loosened (not removed) and bike is confirmed exactly upright, then motor it idled in neutral for a minute, shut down then mounts tightened to spec. Has that been tried?
Edit: Also check that exhaust isn't contacting case or frame?
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,900
Likes: 8,007
From: poway
Do kind of wonder if the BB mount might be causing the vibes..
I'm running the RR3 and broke the muffler mount.. The little triangle brace cracked the weld causing a vibration. The bracket eventually broke.
https://www.hdforums.com/forum/engin...l#post20590959
Seasoned HDF Member
Joined: Jun 2017
Posts: 5,315
Likes: 4,272
From: Granville New York
Since it goes away when you pull in the clutch, that would have me checking the inner primary bearing and then main shaft bearing. Not sure if the 5 speed is the same setup as the six but the main drive gear bearing is suspect to. How many miles are on the bike?
Trending Topics
Club Member
Joined: Dec 2014
Posts: 10,734
Likes: 3,755
From: SWFL
When did you notice the vibrations first? After installing motor kit? After rear motor mount? Who installed mount?
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread Starter
|
Stage III
Joined: Apr 2020
Posts: 3
Likes: 0
From: Norway
I bought the bike with the kit and the BBP mount already installed, so I do not know how it was before. It had vibrations already, but I thought it was kinda normal. It got a little better when I changed the front mount and shimmed it, but still some vibrations. I will try to take out the BigBear mount and check it, could be something there. If it was a bearing I guess it would give off a sound? The motor runs great with no weird sounds.
could it be the flywheel? It is S&S stroker kit. I am unsure if this has been balanced. Should they be balanced before installing? I will ask previous owner if he did this.
Club Member
Joined: Dec 2014
Posts: 10,734
Likes: 3,755
From: SWFL
I bought the bike with the kit and the BBP mount already installed, so I do not know how it was before. It had vibrations already, but I thought it was kinda normal. It got a little better when I changed the front mount and shimmed it, but still some vibrations. I will try to take out the BigBear mount and check it, could be something there. If it was a bearing I guess it would give off a sound? The motor runs great with no weird sounds.
could it be the flywheel? It is S&S stroker kit. I am unsure if this has been balanced. Should they be balanced before installing? I will ask previous owner if he did this.
could it be the flywheel? It is S&S stroker kit. I am unsure if this has been balanced. Should they be balanced before installing? I will ask previous owner if he did this.
Now, the real question. Have you ever had a Harley before? I ask because vibrations are part of the deal with HD V-Twin motors. Some people are more sensitive to them then others, and complain about what are perfectly normal vibrations. So just saying, if you arent familiar, you may be feeling what is normal. Just like the people who complain about ticking top ends, which more often then not are just normal valve train noise inherent to the TC motor. And for some odd reason, different bikes vibrate or tick more then others, all without any mechanical issues
Theres no such thing as a Harley motor without vibrations. Youll need a Honda if you want that