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General Chat (Vincent Related)
Cush Drive too rigid
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<blockquote data-quote="peterg" data-source="post: 24428" data-attributes="member: 446"><p>Howdy Tony,</p><p> </p><p>Compared to other machines with similar setup, Vin's are quite benign and response to modification in this area very linear. Your ESA works in concert with your clutch, ie, breakaway torque reaction on the latter has an influence over how much one must control power pulses through the primary chain which would lead to clutch slip, or ESA windup/release, which is controlled by spring rate against the ESA cam. As engaging clutch takeup with the aftermarket V2's of 15 years ago was nicely linear if the setup for even lift off was achieved without shimming the spring buckets up too drastically, one could remove springs from the ESA which I did as the Red Rap in my sig was not intended for sporting use and to be ridden solo. It is a docile machine that can have the throttle pinned back at 35mph in 4th with a 46 tooth on a 4.50x18 without any unpleasantness. On the other hand the Shadow is intended for sporting use, has a tall 7.2/1 bottom gear on a 3.50x19 thus presenting a roll-off challenge from a stop and full throttle application at low speed. The repro set of springs running through a stock Vin clutch were a bit too firm as I could feel yield in the lightening pilot clutch so I refitted my originals and then flipped the ESA washer over for a slight increase in spring rate for a happy medium.</p><p> </p><p>Like Indians, Vincents were fitted with clutch arrangements designed to accomodate hanging chairs without modification so thus leave lots of lattitude for one to dial in just how much thud they want to see projected through the primary drive to the clutch. I would not hesitate to remove a few springs. I'd also make sure your ESA cam ramps glide over each other smoothly when rotated, any notchiness will sharpen torque pulse and snatch through the primary chain.</p><p> </p><p>If it's any indication, on one of my Indians for which a sintered bronze clutch is fitted with extremely high coefficient of friction on take up as well as a very soft after market ESA installed on this engine that originally had none, I have now dropped from 16 springs to only 8 on the clutch with no slippage, this clutch can be activated with one's finger and power delivery smooth as an electric motor. It's all about getting that ESA to work in concert with one's clutch for a pleasant riding experience.</p></blockquote><p></p>
[QUOTE="peterg, post: 24428, member: 446"] Howdy Tony, Compared to other machines with similar setup, Vin's are quite benign and response to modification in this area very linear. Your ESA works in concert with your clutch, ie, breakaway torque reaction on the latter has an influence over how much one must control power pulses through the primary chain which would lead to clutch slip, or ESA windup/release, which is controlled by spring rate against the ESA cam. As engaging clutch takeup with the aftermarket V2's of 15 years ago was nicely linear if the setup for even lift off was achieved without shimming the spring buckets up too drastically, one could remove springs from the ESA which I did as the Red Rap in my sig was not intended for sporting use and to be ridden solo. It is a docile machine that can have the throttle pinned back at 35mph in 4th with a 46 tooth on a 4.50x18 without any unpleasantness. On the other hand the Shadow is intended for sporting use, has a tall 7.2/1 bottom gear on a 3.50x19 thus presenting a roll-off challenge from a stop and full throttle application at low speed. The repro set of springs running through a stock Vin clutch were a bit too firm as I could feel yield in the lightening pilot clutch so I refitted my originals and then flipped the ESA washer over for a slight increase in spring rate for a happy medium. Like Indians, Vincents were fitted with clutch arrangements designed to accomodate hanging chairs without modification so thus leave lots of lattitude for one to dial in just how much thud they want to see projected through the primary drive to the clutch. I would not hesitate to remove a few springs. I'd also make sure your ESA cam ramps glide over each other smoothly when rotated, any notchiness will sharpen torque pulse and snatch through the primary chain. If it's any indication, on one of my Indians for which a sintered bronze clutch is fitted with extremely high coefficient of friction on take up as well as a very soft after market ESA installed on this engine that originally had none, I have now dropped from 16 springs to only 8 on the clutch with no slippage, this clutch can be activated with one's finger and power delivery smooth as an electric motor. It's all about getting that ESA to work in concert with one's clutch for a pleasant riding experience. [/QUOTE]
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Cush Drive too rigid
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