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Thread: Clutch Mod with Pics (Neil aka C-Leigh Racing Mod) - Pic Heavy

  1. #21
    Rider 4WHLr's Avatar
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    That second washer pictured looks like the one that goes behind the locking/tab washer that holds the inner hub on. Its way to wide to go in the pressure plate for the lifter bearing.
    1986 TRX275R PC2000

  2. #22
    Racer mx250r91's Avatar
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    Applied spring force can be calculated pretty easily. Measure the wire diameter, spring OD, and count the number of coils and enter into here:
    http://www.maultechatv.com/techguide...ator/index.php

    This gives the rate in lb/in then multiply this by the distance the spring is compressed by the bolt (preloaded) and you get the force in lbs.

    I remember Jason (ALL250R) tested a whole bunch of clutch springs a while ago on his site and the results were from weakest to strongest CR500<86-87<88-89

  3. #23
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    Quote Originally Posted by mx250r91 View Post
    Cool thanks!

  4. #24
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    Quote Originally Posted by rsss396 View Post
    the more you compress them the more lbs you will see on a scale ( I have tested this ) and this is with no coil bind so if you shim them they will produce more clamping pressure.
    now the the untested thing here is a 250r spring compressed to the installed height and a cr500 that is shimmed the thickness of a oil drain washer and another .025" for the extra thickness of the 400EX plate since the cr500 is 2mm shorter you probably need to shim it just to equal or increase the clamping pressure
    So are you saying run stock 250R clutch with CR 500 springs and .025 aluminum washers.

  5. #25
    Sphynx rsss396's Avatar
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    No what I am saying is, it should be no different of a clutch mod if you ran a .025 thicker drain plug washer than what Neil's mod calls for.
    the 400ex plate is .025" thicker than a 250r so instead of running out and buying a different plate why not just run thicker washers, obviously this is easier said then done but
    if tony can find a sheet of aluminum that gives us that number then it would be much cheaper.

    i do not know the thickness of the oil drain plug washer but just as a example if it we're say .080 thick then we want a .105" thick washer to run with the cr500 springs.
    or maybe the stock 250r should just be shimmed to make the mod even cheaper, but I will say there is a big difference spring tensions out there so it needs a little experimenting with different springs to find which ones will give the holding power you are looking for.

    Barnett springs are normally much stiffer than stock, so taking a stock spring and installing it with washers may just give you exactly what Barnett is already giving you. Without actual testing of the installed heights of the springs you are really just guessing.
    My suggestions were based on Neil's example that has worked well for him, I cannot say it's any better than just a good set of stiff springs for a 250r.
    I am only pointing out if want to run Neil's mod then it maybe cheaper to just run these extra thick washers

  6. #26
    Sphynx rablack21's Avatar
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    Quote Originally Posted by rsss396 View Post
    No what I am saying is, it should be no different of a clutch mod if you ran a .025 thicker drain plug washer than what Neil's mod calls for.
    the 400ex plate is .025" thicker than a 250r so instead of running out and buying a different plate why not just run thicker washers, obviously this is easier said then done but
    if tony can find a sheet of aluminum that gives us that number then it would be much cheaper.

    i do not know the thickness of the oil drain plug washer but just as a example if it we're say .080 thick then we want a .105" thick washer to run with the cr500 springs.
    or maybe the stock 250r should just be shimmed to make the mod even cheaper, but I will say there is a big difference spring tensions out there so it needs a little experimenting with different springs to find which ones will give the holding power you are looking for.

    Barnett springs are normally much stiffer than stock, so taking a stock spring and installing it with washers may just give you exactly what Barnett is already giving you. Without actual testing of the installed heights of the springs you are really just guessing.
    My suggestions were based on Neil's example that has worked well for him, I cannot say it's any better than just a good set of stiff springs for a 250r.
    I am only pointing out if want to run Neil's mod then it maybe cheaper to just run these extra thick washers
    I like this approach ^^^. And I agree, this seems like this will be cheaper and easier to do this mod and still get the same great performance. I am eagerly awaiting Tony's response for these requests.

  7. #27
    Rider 250Racer's Avatar
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    It worked for me last year when I was in a pinch. My clutch started slipping when heated up and I didnt have the time to get a new one before my next race. Springs and fibers were at their limit. I replaced one 250r plate with a 400ex plate, scuffed up the plates and put the washers on springs and no slipage.

  8. #28
    Sphynx rsss396's Avatar
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    that proves how just a small amount of shim can make a big differance since there is only about .025 differance between the 2 plates so maybe Tony could make up a tuning kit with .025, .050, .075 and .100 kits to try tuning the clamping power and/or adjust for wear in the clutch assembley

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