Vibration
Thread Starter
|
Intermediate
Joined: Mar 2011
Posts: 29
Likes: 0
Vibration
Hey guys I have a 2011 Fat Bob and just started noticing a slight vibration in the bike. I just had a new sprocket installed and it looks installed correctly. My question is have any of you got a slightly lower octane gas and if so did it cause the bike to ride rough, idle differently, miss. any of the above. For me I notice a slight power difference and a small vibration especially at lower RPM.
Road Warrior
Joined: May 2010
Posts: 1,382
Likes: 4
From: Kennewick, WA
Hey guys I have a 2011 Fat Bob and just started noticing a slight vibration in the bike. I just had a new sprocket installed and it looks installed correctly. My question is have any of you got a slightly lower octane gas and if so did it cause the bike to ride rough, idle differently, miss. any of the above. For me I notice a slight power difference and a small vibration especially at lower RPM.
Also keep your gas fresh and avoid ethanol if at all possible.
Advanced
Joined: Jun 2011
Posts: 68
Likes: 0
From: canada
I beg to differ--detonation causes extreme vibration---learned this in the race industry trying to track down why fasteners come off and hoses start to leak- The computer readouts made detective work a whole lot easier--
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,281
Likes: 1,139
From: southeast PA
One time I tried a tank of lower octane just to see what effect it had. Nothing I could notice.
Was the new sprocket the same size or did you gear it down? You just might be lugging it a little.
Was the new sprocket the same size or did you gear it down? You just might be lugging it a little.
Road Warrior
Joined: May 2010
Posts: 1,382
Likes: 4
From: Kennewick, WA
You might try checking the engine mounts for looseness. Vibrations at idle are givens, but should go away, for the most part, when up to speed.
A perceived power loss is another issue. Gearing the bike up will cause weaker acceleration, not to mention more opportunities for the engine to lug.
What sprocket did you replace? And what tooth count did you change from and to?
A perceived power loss is another issue. Gearing the bike up will cause weaker acceleration, not to mention more opportunities for the engine to lug.
What sprocket did you replace? And what tooth count did you change from and to?
Last edited by HemiOrange; Sep 22, 2011 at 11:57 PM.
Road Warrior
Joined: May 2011
Posts: 1,396
Likes: 7
From: Connecticut :(
Trending Topics
Thread Starter
|
Intermediate
Joined: Mar 2011
Posts: 29
Likes: 0
Thanks for all of you responses and to answer everyone's questions I have 1600 miles on the bike, I went back with the same tooth count sprocket 66 just changed to chrome, The things I have done sense my first question is I to try a different gas I was using Valero Premium and I switched to Texaco Premium 93 Octane. Almost immediately I felt the power return still not 100% because I had about a quarter of a tank when I topped off. I also had the service tech test drive and he noticed the vibration as well and just said to bring back if it gets worse.
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
Thread Starter
Forum
Replies
Last Post
