Downright scary looking, has to be a flexing swing arm to cause that motion

 

i truly believe thats the last thing happening its what the swingarm mounts to , or lack there of

 

When I first got my 1989 FLHS I experienced what I called Fish Flopping on a wide sweeping right turn leading onto a highway. Since this was a two lane entrance ramp, and cars were all around me it was "Interesting" to experience.

It scared the crap out of me.

My bike now has the Full "Trackula" True-Track package on it. I've pushed the bike harder since this mod, and it's rock solid.

Don't care to experience that unsteadiness again, and with my bikes improved handling I'm a believer in the Stabilizer set.

 

"Deathwobble" sounds like a great band name!

 

Thanks for the correction and the insight. If it's not a problem on the softails, then it must have something to do with shock geometry. I guess I did kinda jump the gun on that. I only hang around the touring threads, so I only read about it with them. I just assumed.
And speaking of softails, someone got a new ride.

 

It could be something as simple as not enough tire pressure. If the sidewall of the tire begins to flex....

 

It looks to me like it's caused by the fact that the swingarm is rigidly mounted to the engine/transmission, and that whole assembly is allowed to float on a system of Heim joints and rubber mounts relative to the chassis.

 

Happened to me first time last weekend. Did feel very odd and a bit unnerving. Will try to recreate in a bit more of an open space. If happens again, it will be enough for me to seek a correction.

Rear tire pressure was at 40, checked when I got home. Front was high but don't think that contributed to it.

 

Now I'm all paranoid. NOticed something yesterday doing a right hand sweeper on throttle to get on the highway. I thought that it was the lane bump, but I didn't see any! crap. I have noticed this feeling before, i'm just hoping it was some line/bumps tracking sort of thing and not the wobble from hell.

 

I agree. It looks like the engine and swing arm do their own thing in relation to the chassis and forks.. All it takes is a little torsion on the motor mounts to change the rear tire direction when in a turn and it becomes full on excitement.. The only factory link/heim joint is in the middle of the powertrain and acts as a pivot point between the front and rear mounts. So, any little twist will drastically change the track of the bike.. Apparently, the TT kit stops the rear movement and fixes the problem. Seems pretty clear to me, and looks like a great investment if you push your bike through the corners enough to notice the problem..