Question about 2003 Harley Davidson FXDL Dyna Low Rider

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2003 dyna lowrider. at speeds above 70 mph bike becomes very unstable and hard to keep in center of lane. Front end wobbles. Have had bike lazer aligned with no positive results. Have been told by some this is a design flaw that was corrected in 2004 model by increasing the size of the front shocks. Any truth to this ?

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You may want to check the fork stem nut to see if it is tight enough.

Posted on Sep 09, 2009

  • Isolutionary May 25, 2011

    your answer is hidden until now ...High speed wobble has been a well kept seceret for awhile now to all except those that have expierienced it, and was forced to lay it down or at least clean their shorts afterwards, this problem can be traced to 2 places 1. on a FXDWG, it's a 2 fold problem 1 is the 21inch narrow front wheel with an extended front fork that can cause fork Torque, they can actually twist slightly starting an incredible shake, at which point stay away from the front brake adding too much front brake in this condition can make it worse and actually have the bike toss you off by the handlebars apply rear brake first transfering weight backwards then a light apply of front should stabalize it for the moment,but not cure it,and the second cause the one your talking about high speed death wobble is now days mostly assiciated with the Dyna models (all) Buell himself that designed the dyna chasis stated that with the rubber mounted engines and trans that 3 frame contact attachments should be in place ..well thanks HD for making them only have 1. the wobble comes from the vibration of the motor and the trans seperately getting out of synch with one another kind of like a tuning fork once it gets out it shakes bad ..the solution exists for both problems. for FXDWG front end shake and wobble I suggest a fork brace ..nice looking and under $100 attaches just about front fender locking the 2 downtubes together stopping that twist capability, the other for Highspeed Wobble, a little more expensive but a life saver is called Tru Trac. it's a dogbone attachment that you can make yourself under the bike isolatiing the vibration and stabalizing it to the under frame at the trans plate very slick install EZ to do and worth it's weight in Gold,
    Both are purchases that any FXDWG owner should make and the tru trac stabalizer is a must for any DYNA with rubber mounted vibration isolated engines and trans....

    There is one more wobble causer, that most do know about that is a simple fix HD sends it's bikes out of the factory with a poor combination of rich fuel ,low exhaust, each bike is different as to where in the power stroke it starts ,but most do it right at cruising speeds 70-79mph. this can be solved with 3 minor adjustments that everyone should do with a new HD ,thats not SPI (fuel injected),,first remove stock carb jets and replace with one step larger in diameter, 2nd. get an increased airflow intake, breather, and 3rd, remove any restrictors or baffles smothering exhaust...thats it, those 3 things will remove that powerband vibration that is standard on almost all HD's dyna or not, it just smooths out the powerband just remember there is still only 4 strokes to the piston ,Intake Compression,Power and exhaust....

    I hope this helps and depending on the cause of your wobble/shake you may need to do 1, 2, or all of these things ,but once done it will ride like it's on rails

    so to end up ..it's front fork brace for FXDWG, and tru trac stabalizer, and you'll be shocked at the difference, and for the more common power stroke shake that comes with most Harley's as standard, just like the old ones came with an oil leak 1port carb jets or replace,add aftermarket sir intake with good air flow, and remove any possible exhaust restrictors, it will not only make it run smoother in all power ranges it will put a little more get in your go...
    I have been riding for nearly 40 years, and these things mentioned here are not opinions, they are facts,but please do as you should and use this as a point of reference to start your own research into the matter,and you will find confirmation, but don't expect to find too much in regards to the HD blunder of not using the 3 contact points that Buell insisted on in the DYNA chasisas it pertains to the instances of rubber mounted vibration isolation models, the problem isn't that the eng, and trans vibration isn't stopped from shaling the frame it's that theres no way to stop the eng, and trans ,that are seperately rubber mounted, and then conected with the chain which can cause them to start a vibration at 2 different cycles,and then the death wobble begins...............................JOKER

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