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Title: ST2-ST4 dog-bone same as 749/999 ? Post by: phantomaz on November 01, 2012, 09:37:35 AM Hello guys ,are those two linkages same ,or there are some differences? On the pictures they look the same ,but the serial number is different 73210031 vs. 73210034 or ..32 . I am planning to do the 749/999 swingarm swap , I have all the parts except the dogbone. Anyone ?
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: Raux on November 01, 2012, 10:59:35 AM it will fit? the 999 cases are narrow cases (with bearing in swingarm), the st2/4 wide cases (with bearings inside)???
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: phantomaz on November 01, 2012, 02:07:17 PM It won't be direct swap ,a lot of modifications will be required , but my question is about the dogbone/shock linkage/ st2 vs 749, are they the same?
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: Raux on November 01, 2012, 02:09:25 PM sorry. all i know is the st2 and s2r are the same.
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: phantomaz on November 01, 2012, 02:18:42 PM yes ,they have the same serial numbers. thanks!
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: krista on November 01, 2012, 02:42:06 PM I just looked at S2R1000 and 749 that are here. The Monster dog-bone looks longer. It is also starting at a different angle... it points down at the front 30+ degrees. The 749 one is pretty much flat with the ground.
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: phantomaz on November 01, 2012, 02:48:35 PM Thank you very much chris, that's what I needed. On the pictures they looked the same ,and I wondered where the difference is, this one helped a lot , because I was almost ready to buy the st2 linkage. Best regards!
Title: Re: ST2-ST4 dog-bone same as 749/999 ? Post by: MonsterHPD on November 02, 2012, 11:45:20 AM As it happens, I´ve been looking into this in some detail over the years, and a bit more focussed lately since I need to design a linear linkage for the tracSTer track-day bike.
I do not have all the facts (of course ...) but below are a few facts for the different links I´ve checked. The different bikes have different wheel travels, shock travels and leverage ratios; all rockers have a "positive gullwing" shape except for the 749R / 999R "linear" rocker, which is "negative gullwing" As it turned out, I´ll have to design a custom rocker for the tracSTer, but that´s another story. The dimensions below are as accurate as I could make them without access to a proper measurement machine, whatever they´re called, but should be generally accurate enough to see the differences. I hope the table comes out reasonably readable, the forum would not copy an excel table properly. Model Model year...Marking................Rod-pivot...Pivot-shock...Angle Shock-pivot...Wheel travel...Shock stroke M900 2002...........372.1.003.2A........53mm 75mm 23.5°.............148 mm........ 65mm ST4S... S2R... 999 Bip.....................372.1.003.1A.........53mm 68mm 19°................128mm..........71mm 749/999R..................372.1.025.1A.........60mm 58mm -21°................128mm..........56mm Edit: Well, close to reasonable ... EditII: Slightly better .... EditIII: I´ve added wheel travel and shock stroke, will give a hint as to what fits where. I checked the linear 749R link in the Monster, but that would give very strange caracteristis, and shock stroke would have to be shortened. |