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Hello all. I have a 1999 FXDX 10,000 miles. Owned it for a year and it has been a fantastic bike. I bought it with only 4900 miles on it. I rode it last year relatively stock besides Leather Pros and Progressive fork springs and it was a great riding experience. I did experience some wobble mainly on the highway at high speeds (85+).
Since buying the bike:
- installed Progressive fork springs with Maxima 20 wt oil 9.2 oz in each fork leg
- had Dunlop Elites mounted front/rear
Just before my last ride today I performed a 10k service which included:
- Repacked front and rear wheel bearings
- Removed swing arm and repacked the bearing
- Installed a Sputhe front and rear stabilizer kit
- I still need to check fall-away
The bike does feel much more planted and responsive around the back roads hitting corners with confidence. However, out on the highway today I did a lane change to the left lane and got on it hard. Once the bike started approaching about 85 I experienced a pretty nasty wobble and I had to back down. Was able to ride 75-80 the rest of the way home but I won't lie that killed my vibe for the rest of the day and I was pretty bummed since I heard the stabilizer setups practically eliminate the wobble. I am completely confident I installed the kit 100% correctly.
Other than the fall away that I still need to check, what should I be looking at?
I also reached out to Al at Rack and Pull to see if he knows of any pros in my area that utilize his alignment tools:
Looks like ya missed a step with the Sputh mounts. With the front mount bolted in loosely, start the bike and let it idle for a minute, shut it off and tighten the bolts. The drivetrain will self center itself. I've got over 106,000 on my 07 and do that every time I replace my motor mounts. never has a alighment problem.
Looks like ya missed a step with the Sputh mounts. With the front mount bolted in loosely, start the bike and let it idle for a minute, shut it off and tighten the bolts. The drivetrain will self center itself. I've got over 106,000 on my 07 and do that every time I replace my motor mounts. never has a alighment problem.
Hmm just double checked the supplied instructions and mine mention nowhere about starting the bike up but I will give it a try!
Had a similar problem on my 2001 FXDXT. It also had Sputhe mounts (and swingarm). I know some HD techs quite well; they checked fall away and tightened steering stem about a 1/16 turn over spec. Problem solved. No Steering damper used.
If you have laced/ spoke wheels Id also highly recommend checking the spoke tension and having them trued.
I had a wobble, fixed with the vibratechnics motor mount. Found that the wobble came back a few thousand miles later . Turned out to be loose spokes in my rear wheel. Got rid of them for one piece alloy wheels.
Last edited by 2500hdon37s; Feb 21, 2023 at 08:28 AM.
If you have laced/ spoke wheels Id also highly recommend checking the spoke tension and having them trued.
I had a wobble, fixed with the vibratechnics motor mount. Found that the wobble came back a few thousand miles later . Turned out to be loose spokes in my rear wheel. Got rid of them for one piece alloy wheels.
Good point; I had alloy spoked wheels and just made a habit of checking the spokes, especially with 111hp/117tq
Yup I have spokes I will check them out in addition to checking fall away and trying slightly tightened over-spec.
I know a fork brace is highly recommended on the 39mm (I run one on my Shovelhead 35mm), but I'd rather try these things first before throwing more money and parts at it.
Last edited by garystaven88; Feb 21, 2023 at 09:23 AM.
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FXDX High Speed Wobble
