THE DYNA DEATH WOBBLE
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- Опубликовано: 11 сен 2022
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Had a really nice 2005 dyna, FXDXI fuel injected, not many around. I've actually never come across another one that was fuel injected. Bike was clean, never wrecked or dropped it but it developed a bad speed wobble. I chased the problem for almost 2 years, swapped out a few front end parts, motor mounts, front stabilizer, and a couple other suggested add on parts. I still had a bad wobble, took it to a couple shops with no luck. My buddy had some aftermarket shocks for the bike, removed the original shocks and found one shock was no good. After swapping to the new shocks the bike rode totally fine with no wobble. 1 bad rear shock was the issue the whole time, finding the problem was definitely the hardest part.
The swing arm is connected to the trans/motor, not the frame. That whole assembly is mounted by rubber motor mounts. Sputhe makes a great fix to prevent sway with their turn buckle design like the Buell's had
I grabbed an old '97 FXD this year and I'm building it up, and do find it's a littlle loose in corners, so it's getting new motor mounts soon. From my understanding, a lot of the issue comes from guys who allow oil to soak their front motor mount during oil changes, and this weakens the rubber and that makes the rubber too soft to keep the motor/transmission/swingarm in line with the chassis during hard riding. Don't know, but I don't want to find myself sideways mid-corner, so new mounts seem like cheap insurance. If problems persist, I may need to step up to further measures like Sputhe stabilizers or a steering damper.
2002 fxdxt I've done it all. Neck bearings, ohlins rear shocks, rebuilt forks with progressive fork springs, with heavyweight oil, sputhe stabilizers, swapped tires out and had suspension step up by a professional and swapped out front discs that were a little warped. All of these helped bit by bit I could tell the difference each time. The bike handles great now and I'm always confident in it now.
The swing arm is mounted to the transmission, so you’re getting the vibration from the motor and trans in the swing arm hence the swaying feeling in the rear
when you get a job at the dealership, the wobble does not exist. you don’t talk about it like when your aunt got drunk.
Replace wheel bearings as it’s a sign that wheel bearings will soon fail.
2011 street bob owner here, after having the se 110 tire shredder installed and hitting over 100mph many times.....happy to report it rides on rails.....so far 👍
I felt a slight wobble once on my 2017 FXDLS. But I guess us Dyna guys aren't the only ones experiencing wobble. A couple of friends of mine who ride sport bikes said they too are occasionally prone to high speed wobble. One rides a Yamaha R6 and the other rides a Suzuki GSXR 600. I was surprised to hear that some sport bikes are also prone to wobble not just Harleys.
It's the Rear Shock angle, See how the rear Shocks are leaning forward like that. I guarantee that is what's upsetting the Rear end.
Had a '95 FXDL, rear wheel was supposed to be off to the left to counter the primary. Under load that alignment always makes for a weave on anything but flat, add a curve bumps and speed it's going to get hairy every time.
My 06 FLHX street glide did that (in curves above 65mph & straight line above 75mph) even with rear stabilizer & new swing arm bushings. A lot of gear in the saddlebags or passenger helped a lot. Did a road glide fairing swap back during the early spring & that fixed the straight line wobble above 75mph altogether. Still get it in curves at 65 & above. I think it’s all from the swingarm mount being rubber isolated & doubling as a transmission mount
I had a 2007 FXD and had the wobbles on curves going 90 +. mph and once I put on a set of mid level Progressive brand shocks on the back it stiffened it up and took care of the issue. I always heard it was the swing arm as well, who knows. I'm about to get a Softail Lowrider S in about a month so I anticipate no issue.
Make sure your tire pressures are correct when mine are off I can feel the beginnings of the wobble coming out of corners and I have all those stabilizers and mounts.
If it's a stock Dyna, then a wobble at speed is likely caused by rear wheel misalignment. Speaking from experience. The top motor mount heim joint has to be adjusted to put the rear wheel at a perfect 90° to the frame. If your wheel is out of vertical alignment then adding solid motor mounts or stabilizers will not fix the problem. You must get the bike lifted and get the motor aligned correctly to the wheels. It's actually fairly easy to do if you have the tools. The wheel only has to be a few degrees off for it to be noticed. Especially at higher speeds. If your frame is at 0, your front wheel is at 90°, and your rear wheel is at 85° you will get a wobble that gets worse with speed.
Love the video and addressing this in a nice manor, every bike is different. Also riders weight and height make a difference in experience (as you mentioned). Personally run stabilisers on a '04 FXDXI. Funny thing is that I felt a big improvement when I went from a t-sport to a quarter fairing. Also dialling in the suspension changes how the bike handles dramatically. After a bigger change that I couldn't do at home I noticed that the mechanic changed my suspension settings which in turn totally ruined the handling.
My 03 had a wobble so I put stabilizers on the front and back and that took care of it for a while. Then I put on a fairing like yours and it seemed to come back so then I added a steering damper which helped but did not completely eliminate it.
I had some nasty wobble on my 06 FXDBi when I bought it 3 years ago. The tires looked good, then I realized they were the original tires from 06 lol. Bike only had 7000 miles.. I had a shop put on new Dunlop tires that originally came on the bike and had them check the fall away of the front end. The neck bearing nut was not torqued to spec.. The bike rides like it's on rails now. I can press the bars back and forth and it straightens right up. Before it would just wobble when I would do that.. I do notice a slight rear-steer wobble in the back when going through twisty's. I'm definitely going to look into some stabilizers at the engine mounts
That’s like the sketchiest part of that highway too lol. But low key the nicest part. My dude is flying
I have a 02 FXDXT got it new, has 28k on it and I ride it like I stole it, has always been enjoyable to ride. Hoping I don't get into that scenario now that I'm 56, love riding not crashing. Stay safe my fellow riders, beware of the cages.👍✌