admacp Posted July 5, 2005 Report Share Posted July 5, 2005 Checked the clutch hub today on my '04 280 pro and noticed that there is a reasonable amount of movement in the whole assembly. Does anyone know if there is supposed to be a certain amount of movement in the whole clutch basket? (It's more than I imagine would be tolerence but less movement than an imminent failure!). There are no loose bolts - feels like the whole unit is moving as one piece. If not, I have a feeling that the needle roller bearing that's in behind the hub (the one serving the primary shaft and fixed in the crankcase itself) is probably worn. If it is this bearing, does anyone know if you need special extractor tools to remove it and generally if it's a real pain to work on? Quote Link to comment Share on other sites More sharing options...
gasgas Posted July 5, 2005 Report Share Posted July 5, 2005 (edited) Although my avatar is showing the clutch ;)last time i didn't really checked it for freeplay. I imagine that you only feel axial play and not radial play? There is always a amount of axial play to compensate for heat build up. Just make a mental note and check later on again. Radial play you shld be aware of, cause then things can get ugly. Although again a bearing has a certain amount of radial play also otherwise it wld lock up again with heat buildup. Bearing tolerances shld be within 3 / 5 micron and is hardly to feel when you wiggle them. So play itself won't mean trouble automatically. Edited July 5, 2005 by gasgas Quote Link to comment Share on other sites More sharing options...
admacp Posted July 5, 2005 Author Report Share Posted July 5, 2005 I have a feeling that there is way too much free movement to allow heat buildup. I think I am going to change the bearing for safety's sake. Has anyone any experience of renewing this bearing and if any tools are required? Quote Link to comment Share on other sites More sharing options...
subira Posted July 5, 2005 Report Share Posted July 5, 2005 Replaced the bushes on an '03 with the needle rollers. The bushes needed to be pressed out but the rollers don't need any special tools, when you remove the basket you will be able to remove them by hand (fingers!). Quote Link to comment Share on other sites More sharing options...
admacp Posted July 5, 2005 Author Report Share Posted July 5, 2005 Hi Subira - I don't understand the "bushes" you are referring to! My '04 has a needle roller bearing (same as in the Parts Book) which is a one-piece job. I can't see any other bushes as the primary gear shaft slots through the bearing to connect the clutch hub. There is a fair bit of "movement" I think, on this bearing. Prior to you replacing the bearing on your bike - was there a noticeable "rattle" noise coming from the engine? I have an annoying rattle which I hope is coming from this potential bearing problem. Quote Link to comment Share on other sites More sharing options...
subira Posted July 5, 2005 Report Share Posted July 5, 2005 The bushes are on the pre-04 bikes. Roller bearings replaced the bushes in 04 and later. Some folks know I have an 03, so I just wanted to point out that I was talking about the rollers bearings that I retro fitted. There are actually two roller bearings and a circlip that the basket floats on. The clutch noise was less after replacing the bearings but it still rattles when the clutch is disengaged - as do most Pro's. I would compare the noise level with another Pro and see if it is any worse/better before you tear it down. Will be worth checking your plate thickness while you have it all apart, a search on 'clutch' in the 'gasgas' forum will find how to do this. Quote Link to comment Share on other sites More sharing options...
admacp Posted July 5, 2005 Author Report Share Posted July 5, 2005 I know the bearings and circlip you are referring to, I have already replaced one of them as there was a needle "missing" when I had a first look. It is the needle roller bearing that is in behind those and is embedded in the crankcase half. You have to split the crankcases to get at it - that is the bearing I am referring to. Quote Link to comment Share on other sites More sharing options...
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