General Category > Bike Builds, Rebuilds And Restorations Only
Well I think I finally found a suitable project a 78 t3
benebob:
So you think that “pogo” even limited to about 45-50mph speeds is one or both front dampeners being empty then. Seemed a little odd to me as any slower or faster and it disappears pretty quickly. I’d figure at 50 years old i might as well just replace em as they don’t appear to be that expensive. Any method you can think to tell which forks I actually have on there? Is the sp one longer externally by that 20mm by chance?
Getting my parts list ready for ya for that one you are parting but doubt things will happen on that end til I get back from the greenbrier concours the first week of may. Soon gonna need to focus on getting the - prepped for that.
Antietam Classic Cycle:
--- Quote from: benebob on April 08, 2026, 08:19:43 AM ---So you think that “pogo” even limited to about 45-50mph speeds is one or both front dampeners being empty then. Seemed a little odd to me as any slower or faster and it disappears pretty quickly. I’d figure at 50 years old i might as well just replace em as they don’t appear to be that expensive. Any method you can think to tell which forks I actually have on there? Is the sp one longer externally by that 20mm by chance?
Getting my parts list ready for ya for that one you are parting but doubt things will happen on that end til I get back from the greenbrier concours the first week of may. Soon gonna need to focus on getting the - prepped for that.
--- End quote ---
My 1000SP would only "pogo" at about the same speed, on bumpy turns. Draining and refilling the dampers cured it. The dampers are never empty (if they were then that would mean they'd be leaking and I wouldn't bother refilling them), but rather the oil used is just too low viscosity to provide adequate damping after years of use.
It's hard to tell what mixture of parts you might have - it could be just the SP lowers were used with the original T3 internals, or they could be complete SP forks. I think you'll need to remove the dampers to tell.
benebob:
Fork is off and dampener and spring are out. Now exactly how do I measure it to tell if it is a 850t3 or a sp set up. Looking at Crusty Cycles seems they list a 395mm for the 850t3 which is roughly 15.5 inches so I would assume it is stretched out tip to tail correct, they then list the 410mm ones for the later bikes and sp as being 410 or 11.5" which of course with my math 410 comes out to be about 15.25" not 11.5. there should be no need to remove the dampener from the springs correct as I'd like to put it all back together while I wait for the new bit. 'Have about 100 miles on her so far so she's coming along.
If I measure it as assembled I get roughly 15.5 inches from the bottom of the female threads on the dampener up to the bottom of the nut on the male threaded side. Just what to make sure I order the right ones. Thanks!
Antietam Classic Cycle:
--- Quote from: benebob on April 16, 2026, 08:10:21 AM ---Fork is off and dampener and spring are out. Now exactly how do I measure it to tell if it is a 850t3 or a sp set up. Looking at Crusty Cycles seems they list a 395mm for the 850t3 which is roughly 15.5 inches so I would assume it is stretched out tip to tail correct, they then list the 410mm ones for the later bikes and sp as being 410 or 11.5" which of course with my math 410 comes out to be about 15.25" not 11.5. there should be no need to remove the dampener from the springs correct as I'd like to put it all back together while I wait for the new bit. 'Have about 100 miles on her so far so she's coming along.
If I measure it as assembled I get roughly 15.5 inches from the bottom of the female threads on the dampener up to the bottom of the nut on the male threaded side. Just what to make sure I order the right ones. Thanks!
--- End quote ---
410 mm = 16.14" not 15.25". MG Cycle lists the dimensions as "overall length" which to me means fully extended, body and rod. Your measured 15.5" plus however much male thread is past the nut (~ 5/8"?) makes it sound like SP dampers to me.
benebob:
Thanks for catching my typo. Had 16.15 in my head but also had the 15.5 in there😭. So you would go with the 16.15 ones then. I like that idea as they are a couple gallons of gas cheaper.
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