shercoben12 Posted February 25, 2013 Report Share Posted February 25, 2013 Hi My friends bike has an issue with the clutch i think it need new clutch plates? Here are the symptons.... When changing up to 4 th gear and higher the revs go down as normal but when you try to go faster the revs get higher and you don't get faster. Also when dumping the clutch lever out on.a standstill the bike only beggins to move a fraction of a second later. The lever is also extremely light to pull on I think the previous owner must have modded it. And you let the lever out all most all the way and the clutch only engages in the last cm of lever travel. ( I don't know if that has something to do with it)? He uses gro 75w gearbox oil as reccomended by Gas Gas. I think he will new clutch plates? What do you Guys think? Quote Link to comment Share on other sites More sharing options...
j13me Posted February 25, 2013 Report Share Posted February 25, 2013 Sounds like clutch slip. Is the oil dark? Smells burnt? Quote Link to comment Share on other sites More sharing options...
shercoben12 Posted February 25, 2013 Author Report Share Posted February 25, 2013 That's what I am thinking. The oil is fine. Quote Link to comment Share on other sites More sharing options...
guys Posted February 25, 2013 Report Share Posted February 25, 2013 Is there enough play between the lever and the plunger in the master cylinder? Does the plunger returns to it's resting position completely? Quote Link to comment Share on other sites More sharing options...
j13me Posted February 25, 2013 Report Share Posted February 25, 2013 There is a great set up video on the Gas Gas youtube page by Jim Snell Quote Link to comment Share on other sites More sharing options...
shercoben12 Posted February 25, 2013 Author Report Share Posted February 25, 2013 The lever is set perfectly. Quote Link to comment Share on other sites More sharing options...
shercoben12 Posted February 25, 2013 Author Report Share Posted February 25, 2013 The problem has nothing to do with the master cylinder as that's all fine:) So I am guessing clutch plates Quote Link to comment Share on other sites More sharing options...
j13me Posted February 25, 2013 Report Share Posted February 25, 2013 Sounds that way. Maybe worth changing oil. Cheap option and if it doesn't sort it just reuse it after you Change the plates Quote Link to comment Share on other sites More sharing options...
shercoben12 Posted February 25, 2013 Author Report Share Posted February 25, 2013 That's done regularly. Is it the plates then? Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 25, 2013 Report Share Posted February 25, 2013 The height of the fingers in the clutch is too much. It has to be brought back down with a thicker steel plate. Check the proper thickness for the clutch pack. One plate is cheaper than a new set! Quote Link to comment Share on other sites More sharing options...
shercoben12 Posted February 25, 2013 Author Report Share Posted February 25, 2013 Thanks line away Would the finger hieght make the clutch slip? Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 25, 2013 Report Share Posted February 25, 2013 Yes, I just did this last week on my son`s bike. You could need a new clutch, but check if it is out of spec first. The plates come in different thickness. From 1.3-1.6, you will need to have it checked for proper set up. Quote Link to comment Share on other sites More sharing options...
sting32 Posted February 26, 2013 Report Share Posted February 26, 2013 (edited) Hey Ben, Seriously Lineaway is right about everything so far, in our experience, the clutches dont go "bad" normally, so 1st thing we'd do is check all of these things in order. 1st being that the lever has a tiny free play before the actual plunger (behind the rubber boot) moves, 2 that the plunger behind the boot, is coming to rest on the C-Clip, if it doesnt then the clutch slave is NOT being let off the last little bit. Then when you think that is all good, you take the side case off, with bike laid on side of course, and using a slide caliper measuring device, you measure up how high the fingers are above the inside of the basket back wall (not where the screw holds clutch on shaft, but beside it). if it is about 19.5 mm MAXIMUM height, after that they slip all the time because the levers cannot rais that HIGH with cover on... The MOVIE I'll link to, will explain and give you the exact measurements. you would remove the thicker of the plates, you deside this with same tool measuring thickness, the ones without padding, but NOT the bottom plate! thinner one lower the fingers. I have 5 of 5 times, had to do the opposite, put in thicker plates, to get fingers close to Snells max settings, makes clutch pull easier and "slower"... Here is the link to the movie that shows you how to fix clutch to Specs... http://www.youtube.com/watch?v=hjoj7n74G0s&list=PL391F2719952C8DFB part1 http://www.youtube.com/watch?v=n0adW9BsAN4 part 2 http://www.youtube.com/watch?v=336BDbcZEMM Part 3Reason for several movies I believe because of updates, watch them all, then watch the main one you feel helps you the most... Good luck Edited February 26, 2013 by sting32 Quote Link to comment Share on other sites More sharing options...
shercoben12 Posted February 27, 2013 Author Report Share Posted February 27, 2013 Thanks alot that was really helpful. Thanks! I will show them this thread and hopefully we can get it done:). So how do I make my clutch easy to pull and light and bite in the first 1/5 of lever travel without slipping? That's what I want. Quote Link to comment Share on other sites More sharing options...
sting32 Posted February 28, 2013 Report Share Posted February 28, 2013 (edited) what year bike? in 2006 they changed the 'spring rate" you might say, of that "bellville spring" doesn't look like a spring... BIKES BUILT BEFORE --> 2006, it is easier to pull just by updating the spring. I think it costs about $15 for the spring, depends on shipping I guess. not sure what else you can do to make it easier, other than the closer to 19mm the easier the "pull" is (has to do with leverage I understand). Anything over 19 though, you risk slipping, because when cover is on, the fingers can ONLY raise to 19.5 (that would be depending on which gasket you use as well on the case). the paper cheapy ones, are really thin. Edited February 28, 2013 by sting32 Quote Link to comment Share on other sites More sharing options...
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