Tire Problem ... "DEATH WOBBLE"

[BumpaD_Z28]

Okay so let me re-cap
original tire= no wobble
new tire =wobble
different new rear tire = wobble
rear tire balanced twice = wobble
rear wheel aligned = wobble
no damper = damper not bad
rear wheel assembly correct per manual?
happens at same speed +- 5mph   
       
what speed is it again?
wheel bearings checked for play side to side?
swingarm shimming checked for play at the swing arm pivot?
steering head bearings checked for detents?
slotted adjusters?
motor mounts tight?
no cracks at motormounts?
check for cracks at frame , monsters tend to crack at the center between the two motor mounts where there is only one tube.
cracks on triple trees?

To be honest if this has been an issue I would find a good shop and have them give it a once over you may be missing something, these bikes do not have death wobbles normally. I would saY THAT IT SHOULD BE A FAIRLY EASY FIND FOR A ( damn caps lock button) good mechanic. I do know that the dunlops tend to be stiff and this could affect your suspension but I doubt it would only be at one speed. I would look for something damaged or worn at this point.

I had a customer bring me a monster last summer to fix his starting problem, he never had noticed his frame was broken and steering head angle is now around 19 degrees with the front tire contacting the head. He never noticed a handling problem, I would have yours checked by a pro. It may be a tiny fix and not worth fighting yourself. Or you might find out you need a new bike.

It happens right in the 82-87 MPH range ...

THANK YOU VERY MUCH for all the suggestions, ... Looks like I need to get the bike in the air and start checking / disassembling and reassembling the rear ...

I hate the though of taking the bike to a shop, about the only one I wold consider us SLMS (http://www.saltlakemotorsports.com/), I know they have a KICK ASS engine guy , but as far as suspension and chassis I dunno

I just have had too many bad "life experiences" with having other people work on my stuff, so I normally do 99.9% of my own wrenching (on ALL the vehicles), and I do consider myself a good mechanic (I was ASE certified at one time but have since expired).

Also a slight problem with snow on the roads here (UTAH), it will be a couple of months to see if anything I change has any effect

Hope I can resurrect this thread then !

THANKS AGAIN EVERYONE !!!

~DaVe

[clubhousemotorsports]

Dave
you might want to just get another  set of eyes to look it over with you, find another home mechanic in your area that works on ducati's there must be someone.

I am a professional mechanic and there have been plenty of times a second set of eyes have helped, even when the second set did not know they just found what I was looking for.

[Smokescreen]

Sounds like in the interim the replacement of a front tyre with one that matches the rear may be the cheapest option.  Dunlop, Bridgestone, Michilin, Pirelli, c'mon none of them are aweful, and unless you are dragging knee and elbow, you won't be causing slip in any of their sport tyres.  I'm sure a Qualifier front would work just fine.  It is distinctly possible that you have chosen two tyres that don't work together.  So either replace the front, wear out the dunlops and buy a new Avon rear when you are ready to finish off that Avon front.  Of course you said your Avons are no longer available.  If you can't order them online (www.cycledepot.com) maybe you need to let them go. 

IF....  This is the issue, you'll know right away and you'll only have changed the one thing you changed to create the issue...  There's something to that.

If you are doing a lot of freeway riding consider something LIKE the Pilot Road 2CT, or the Diablo Strada.  I've dragged knee with Pilot Road 2CTs on and never encountered slippage, and now that I'm running supersticky Sportmax GPs I can tell you I miss having tyres that didn't require much warmup.  I am a kneedragger on my Monster, and the Sportmax GP is more tyre than I need, and is honestly sort of scary when it comes to cold tyre slip. 

Keep us up to date, and when you ride East lemme know, I'm riding outta the Springs right now!  So I can dig your snowy road concerns.  I'm really not liking my bikes "super sticky shoes" in this season!

[BumpaD_Z28]

Dave
you might want to just get another  set of eyes to look it over with you, find another home mechanic in your area that works on ducati's there must be someone.

I am a professional mechanic and there have been plenty of times a second set of eyes have helped, even when the second set did not know they just found what I was looking for.

VERY TRUE, when I get it too the point that we can thoroughly look it over , I'll have a "biker buddies" party and see if I'm missing something really obvious THANKS !

Sounds like in the interim the replacement of a front tyre with one that matches the rear may be the cheapest option.  Dunlop, Bridgestone, Michilin, Pirelli, c'mon none of them are aweful, and unless you are dragging knee and elbow, you won't be causing slip in any of their sport tyres.  I'm sure a Qualifier front would work just fine.  It is distinctly possible that you have chosen two tyres that don't work together.  So either replace the front, wear out the dunlops and buy a new Avon rear when you are ready to finish off that Avon front.  Of course you said your Avons are no longer available.  If you can't order them online (www.cycledepot.com) maybe you need to let them go. 

IF....  This is the issue, you'll know right away and you'll only have changed the one thing you changed to create the issue...  There's something to that.

If you are doing a lot of freeway riding consider something LIKE the Pilot Road 2CT, or the Diablo Strada.  I've dragged knee with Pilot Road 2CTs on and never encountered slippage, and now that I'm running supersticky Sportmax GPs I can tell you I miss having tyres that didn't require much warmup.  I am a kneedragger on my Monster, and the Sportmax GP is more tyre than I need, and is honestly sort of scary when it comes to cold tyre slip. 

Keep us up to date, and when you ride East lemme know, I'm riding outta the Springs right now!  So I can dig your snowy road concerns.  I'm really not liking my bikes "super sticky shoes" in this season!

I do like your thinking, and I really hope that a tire switch / replacement, makes some change .... But from the very helpful people on here it looks as if I might have another problem

And you are right I'm sure all the tire manufactures make good tires, I just get a little too biased once I have a bad experience ... and I've NEVER seen an bad AVON tire on my bikes or on anyone else's (I suggested them to people for quite some time)

My jump from AVON to Bridgestone probably has something to do with all the "B" logos on the 1:18 bikes on the top of my desk


THANKS for the REPLIES !!!

~DaVe

[BumpaD_Z28]

Well this is an ancient thread resurrection, but FINALLY this spring, I installed a matching AVON AV60 rear tire ...

So far 50 miles of 70-110 ish sweeps and NO WOBBLE

I still need to hit the freeway though as that is where the problem was most prevalent ...

~DaVe