Sputhe Positrac arrived today [pics]
#21
Yes, I'd say the one I got is an updated design. The cost for just the front stabilizer is $180 plus shipping. The part number for just the front stabilizer is 9105.
Buell bikes do have three stabilizers. But long before Eric Buell started making his own bikes he was an engineer at Harley. He was responsible for the FXR chassis and for that bike he specified a top and front stabilizer only.
Buell bikes do have three stabilizers. But long before Eric Buell started making his own bikes he was an engineer at Harley. He was responsible for the FXR chassis and for that bike he specified a top and front stabilizer only.
#22
Very interesting thread. I'll be paying attention, as I want to do this sometime this season with either Sputhe or True-Track.
What would be a really good experiment is to do the front, take it off and install the back, then install both and report on the differences. Do you happen to know how much just the back is?
What would be a really good experiment is to do the front, take it off and install the back, then install both and report on the differences. Do you happen to know how much just the back is?
#23
You sure he specified the front only? Truth could be that Harley 'convinced' him to say he did. Everybody lies. Anyway, a few have reported trying the TT front only. I think they noticed a slight difference, however, things came together when the rear was then installed.
As for Eric Buell, I don't know whether he has ever publicly commented on the design of the FXR frame or not. Harley put him in charge of designing the FXR and since it only has two stabilizers, I'm assuming that's the way Buell designed it. If he'd wanted three stabilizers I'm sure it would have three.
#24
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I guess I was paying attention this morning on my way to work. Making a left turn onto the on ramp of the interstate I felt that wishy-washy backend problem we've all dicsussed. My understanding is that the TT or the Posi-trak is supposed to eliminate that, correct?
I wonder how much of that is engine flex and how much is rear suspension.
I wonder how much of that is engine flex and how much is rear suspension.
#27
I guess I was paying attention this morning on my way to work. Making a left turn onto the on ramp of the interstate I felt that wishy-washy backend problem we've all dicsussed. My understanding is that the TT or the Posi-trak is supposed to eliminate that, correct?
I wonder how much of that is engine flex and how much is rear suspension.
I wonder how much of that is engine flex and how much is rear suspension.
And given that on the FXR where Buell specified only two stabilizers, he chose top and front rather than top and rear, it seems the choice is clear if you're only going to run two on a Dyna--especially given the ease of installation issue. The front stabilizer is the way to go, IMO, if you're only going to install one additional stabilizer.
#28
The ones that have posted on here who have tried just the front have reported more than just a "slight" difference.
As for Eric Buell, I don't know whether he has ever publicly commented on the design of the FXR frame or not. Harley put him in charge of designing the FXR and since it only has two stabilizers, I'm assuming that's the way Buell designed it. If he'd wanted three stabilizers I'm sure it would have three.
As for Eric Buell, I don't know whether he has ever publicly commented on the design of the FXR frame or not. Harley put him in charge of designing the FXR and since it only has two stabilizers, I'm assuming that's the way Buell designed it. If he'd wanted three stabilizers I'm sure it would have three.
#30
This latest Sputhe looks much neater than my TT kit, the front mount being a bit of an eyesore. But it works and I also have one of their kits on my Glide. My Firebolt came with three stabilizers from the factory, as do all current Sportsters!
As well as the FXRs having just two stabilizers, so also do the touring models, up to 2009, when they got an entirely new frame and fresh engine mounting system. The topic of the third link gets frequent air time in the Touring forum, helped by there being around a dozen brands making variations on the TT theme!
Frankly, I am surprised Sputhe will sell only one link instead of two. By fitting only one, there will surely be increased loading on the other one? Having experienced wobble (or whatever you want to call it) on my dresser with just two links, it seems pointless to fit only one to a Dyna. It may be slightly better, but not as good as it could be.
I have three bikes, each with three stabilizers. It is the only way to travel!
I have studied US patent records on engine mountings and handling stabilizers. Most of the common bike makers have tackled these problems over the years and registered their solutions. Buell registered his 3 links back in 1988, if I recall correctly, and here we are twenty years later still solving the problems he solved back then! Thanks to TT and Sputhe, we have the means available to us.
As well as the FXRs having just two stabilizers, so also do the touring models, up to 2009, when they got an entirely new frame and fresh engine mounting system. The topic of the third link gets frequent air time in the Touring forum, helped by there being around a dozen brands making variations on the TT theme!
Frankly, I am surprised Sputhe will sell only one link instead of two. By fitting only one, there will surely be increased loading on the other one? Having experienced wobble (or whatever you want to call it) on my dresser with just two links, it seems pointless to fit only one to a Dyna. It may be slightly better, but not as good as it could be.
I have three bikes, each with three stabilizers. It is the only way to travel!
I have studied US patent records on engine mountings and handling stabilizers. Most of the common bike makers have tackled these problems over the years and registered their solutions. Buell registered his 3 links back in 1988, if I recall correctly, and here we are twenty years later still solving the problems he solved back then! Thanks to TT and Sputhe, we have the means available to us.
Last edited by grbrown; 04-23-2009 at 10:59 AM. Reason: Added last para.