Evo engine vibration.......ugh..again!!
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
Likes: 22,718
From: Farmington ,MS
Vibration in the RPM's you are describing is a common dyna complaint...google "harley engine vibration" and read for days...seems the fix is always the front mount or exhaust mount. the Predator mount still has to be checked for clearance, and any aftermarket exhaust mount would be highly suspect.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
I had a twincam Dyna which had a vibration patch, although it was a little higher up the rev range IIRC. I put it down to it being a TC88, but it may be a Dyna thing. I lowered the gearing, for performance reasons, which also shifted the vibration below the road speed range when it was most annoying.
6th Gear
Joined: Aug 2020
Posts: 11
Likes: 0
From: Yorkshire
Okay, thanks. I'd send him a PM but guess I don't get this until I've posted 10 times or something.. Does this site allow PM's?.. thanks
Dirt don't hurt
Joined: Jan 2011
Posts: 21,062
Likes: 4,547
From: Haslet Texas
Yes it does.
6th Gear
Joined: Aug 2020
Posts: 11
Likes: 0
From: Yorkshire
See if he comes along.. If not, could someone PM him for me? I'd really like to see if he found the issue.
This is a link to my post on another forum. TBH it started one way as to why the engine had been mounted strange, but has now turned into a vibration post
https://harleytechtalk.com/htt/index...tml#msg1359761
... Many thanks
This is a link to my post on another forum. TBH it started one way as to why the engine had been mounted strange, but has now turned into a vibration post
https://harleytechtalk.com/htt/index...tml#msg1359761
... Many thanks
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
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
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Seasoned HDF Member
Joined: May 2008
Posts: 21,032
Likes: 12,559
From: South Carolina
6th Gear
Joined: Aug 2020
Posts: 11
Likes: 0
From: Yorkshire
Yes, its a 1989 FXR that's been re-built 2500 ago. It had 32K as a donner bike. The engine was renewed by a slight hone and new rings (that's all I know about). The bottom end was inspected and given a green light.
No idea if the bike did it before. I think this is why the bloke I bought it off sold it and removed the S&S so it was a non-runner
But He'd spent a fortune on it so had to be worth buying!!
Just wondering if he's knocked something out of balance somehow?.. that said I've had the front sprocket off so myself when I did the gearbox output shaft upgrade (key to splines) but I did it by locking the primary.. makes you wonder if he used a rattle gun or something??
No idea if the bike did it before. I think this is why the bloke I bought it off sold it and removed the S&S so it was a non-runner
But He'd spent a fortune on it so had to be worth buying!!
Just wondering if he's knocked something out of balance somehow?.. that said I've had the front sprocket off so myself when I did the gearbox output shaft upgrade (key to splines) but I did it by locking the primary.. makes you wonder if he used a rattle gun or something??