gasgasshetland Posted May 26, 2014 Report Share Posted May 26, 2014 Hi there, I bought a new Gasgas pro racing a couple of weeks ago and each time i have ridden it the clutch lever pumps up until i can only pull it part way in. This happens when riding in tight rocky type sections when using the clutch a lot. It can be temporarily sorted by fully letting the clutch lever out. My thoughts are there is possibly air in the system. Has anyone else had this problem and what type of mineral oil is recommended. tried the dealer today but they are closed due to the holiday i suspect. Any advice would be welcomed Quote Link to comment Share on other sites More sharing options...
smalley250 Posted May 26, 2014 Report Share Posted May 26, 2014 Its Dot.4 and if you have put mineral oil in to top up it will knacker the seals up. Air in the system makes it spongy and you have to usually pump it up to work not quite what you describe. Easy way to work air out that always works for me, take cover off the lever reserve making sure its flat not to loose fluid, then pump lever slowly and increase speed on the pumping of lever, wait a minute and i rattle the cables to allow air to rise and repeat. Make sure you have a rag at hand to make sure any Dot.4 fluid is not spilt as its harsh on paint. This method gets rid of small amounts of air and if this fails its a complete bleed process that maybe required. 1 Quote Link to comment Share on other sites More sharing options...
gasthatchgas Posted May 26, 2014 Report Share Posted May 26, 2014 Unless they have changed things on the 2014s they have always used mineral oil on the pros. Quote Link to comment Share on other sites More sharing options...
smalley250 Posted May 26, 2014 Report Share Posted May 26, 2014 Unless they have changed things on the 2014s they have always used mineral oil on the pros Yes you are correct mineral oil on clutch and Dot.4 on front brake. Just check mine and it does say it on the 2014 model on covers. Quote Link to comment Share on other sites More sharing options...
gasgasshetland Posted May 26, 2014 Author Report Share Posted May 26, 2014 Cheers for the replies. I haven't used dot 4 etc. I will try getting the air out of the system. The only mineral oil I had found at an autoshop was comma. LHM+ mineral oil. Wasn't sure if it would be ok. Thought I would talk to appleyards tomorrow to ask about what oil. It's just a it annoying what with it being brand new and having to start working on it. Haven't even managed to fall off it properly yet!! Though am sure it's going to happen soon enough Quote Link to comment Share on other sites More sharing options...
lineaway Posted May 26, 2014 Report Share Posted May 26, 2014 You have adjusted it to where the piston does not fully release. That is why it pumps up. Quote Link to comment Share on other sites More sharing options...
gasthatchgas Posted May 26, 2014 Report Share Posted May 26, 2014 Yeah, make sure there is play on the lever when it is fully released Quote Link to comment Share on other sites More sharing options...
telecat Posted May 27, 2014 Report Share Posted May 27, 2014 LHM is correct. Give away is that the fluid is Green. Quote Link to comment Share on other sites More sharing options...
gasgasshetland Posted May 27, 2014 Author Report Share Posted May 27, 2014 Thanks again for the replies. Hadn't adjusted clutch and there is free play between fully off and lever being pulled in. Thanks for the note regards LHM being correct fluid. Spoke to dealer and they are getting back to me but possible that the piston is sticking in the master cylinder so hopefully get that sorted and be good then. Quote Link to comment Share on other sites More sharing options...
dan williams Posted May 31, 2014 Report Share Posted May 31, 2014 The hole between the resevior and the piston chamber may be blocked or improperly drilled. Quote Link to comment Share on other sites More sharing options...
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