Scorpa SY-250R Clutch Lever Effort

Discussion in 'Trials' started by StuInFH, Oct 29, 2013.

  1. StuInFH

    StuInFH Been here awhile

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    Yup, as the springs are Square End, effectively coil bound on ends, considered putting to belt sander, watching that they don't go cockeyed. Industry friend said will simply measure rate of OEMs and source some lighter ones.
    #21
  2. laser17

    laser17 Been here awhile

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    Since you asked.

    In GG's - Dot 5 (silicone based) clutch fluid will help reduce seal stiction and friction and have a small but noticeable overall effect on lever pull. I would assume that this may also be noticeable in other designs.
    #22
  3. StuInFH

    StuInFH Been here awhile

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    Good point on MC sizing, will follow up to see what was actually changed for those pros.

    My mistake for posting this on Trials forum. After 45+ yrs riding offroad/mx/street/etc. and now trials (for four relatively short years), I know a little bit about arm pump causes and cures (and admittedly nothing about fluid mechanics, which is magic to me). (BTW, when was the last time you heard of a (now smaller) mx pro getting surgery to his forearm muscle sheath? hmmm)

    I guess I wasn't clear enough that I'm setting up my Scorpa for hard enduro riding, i.e., racing buddies thru the tough stuff, like Little Sluice on Rubicon. Think EX stuff. Not trackstanding in a short section. Inarguably, EVERYONE that does that type of riding can benefit from a lighter pull. Or even an auto clutch like sissies use, like on my girlie KDX.

    Anyone know the part number for lighter springs?

    JK, the answer is obviously no, so I will measure the OEMs and source some myself. If anyone wants the PN/source info later, let me know. I can hardly wait to say Man Up!:lol3
    #23
  4. motobene

    motobene Motoing for 44 years

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    I hope no mistake posting here! In the non trials, refrigerator bike, floppy-back bars-in-lap forum areas your trials/Scorpa question could be viewed as alien and utterly weird, and leaving the fold :huh

    I came out of Expert Cross Country Racing and know the fun you're seeking. I've had some big fun pushing a trials bike as fast as possible in tight, gnarly woods and other nasty 2 track. It's a hoot to eat up the guys on refrigerator bikes in the tight and nasty, but then we get dusted when the nasty opens up to big sand whoops. Oh well. I'm no longer into maximum fast in the open. Just too risky to life and limb.
    #24
  5. StuInFH

    StuInFH Been here awhile

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    I know you can ride.

    http://www.youtube.com/watch?v=Cp3m6c5XSnU&feature=player_embedded EX on TBs at 2:17. Inmate/narrator is funny. Looks like fun event w/o neck-breaking speed. Couple club members rode the one in Sac, one on his TB, other on his enduro. Toying with the idea myself before way too old, only a bit too old right now. Need to practice more, but got the bike and the whiskey throttle part mastered already. Cheers
    #25
  6. motobene

    motobene Motoing for 44 years

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    That was great narration! "Then it was our chance to ride..." I had a good laugh. Trials is great for face planting the ego.

    If I was younger I'd be right there doing Endurocross on some 'refrigerator' bike. But alas, I value my delicate parts these days....
    #26
  7. motobene

    motobene Motoing for 44 years

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    Thanks. I've wondered about this. Somewhere may be tech data on the effect specific oils have on the static and dynamic friction coefficients between various materials.

    How much is assumption and how much real? I wish I had a Chatillon gage to do before-after force testing.

    I should try the Dot 5 for direct experience. Have tried the OEM low viscosity mineral oil, higher viscosity mineral oil, mineral oil and ester based shock fluid. I should pull the primary cover off and do a full exchange by forcing Dot 5 bottoms-up by filling the top hat (piston).
    #27
  8. laser17

    laser17 Been here awhile

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    All I can tell you is that I tried it and noticed it. Im also a perfect candidate for the placebo effect! :D
    #28
  9. motobene

    motobene Motoing for 44 years

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    And confirmation bias :evil
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  10. laser17

    laser17 Been here awhile

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    Absolutely! Especially when someone like John Stoodley is behind it. :ear
    #30