bogwheel Posted July 20, 2009 Report Share Posted July 20, 2009 Just wondering what gearbox oil people are using these days. I would like to try synth equivilant 10W/30 or /40 as i use in my gas gas - can anybody comment please? I will stay with ATF in the clutch though. Also i have just rebuilt my M199 forks (just two new o-rings and made up new piston seals)what a difference. the forks are now the best i have ever had on a Taco but feel a bit firm for my light weight. I have always gone by the what is the norm (180cc - SAE 20/25) can anybody comment on a lighter oil or more airspace before a go to the effort of changing it. thanks Quote Link to comment Share on other sites More sharing options...
pedronicman Posted July 21, 2009 Report Share Posted July 21, 2009 Hi in the 199 gearbox the recommended oil is EP90 - usually available from car factors or lawnmower shops. Using 10w40 proper motorcycle gearbox oil is ok - 500ml don't use car 10w40! In the forks the std oil is 15wt fork oil , you could also try more oil in each fork , but don't go over 200ml in each leg. If they are still too soft then install new springs. Quote Link to comment Share on other sites More sharing options...
bultaco49 Posted July 21, 2009 Report Share Posted July 21, 2009 (edited) Hi - For my Bultaco I always use 600ml Castrol ep 90 in the gearbox. Older manuals recommend sae 140 but its hard to get and probably ep90 has superceeded it anyway. For the forks I use 180ml Castrol synthetic sae 10. Other people I have come across use atf and some heavier oils - depends how you like your forks to feel I guess. If they are not fitted already, a set of top nuts with valves are a good modification over standard. Tim Edited July 21, 2009 by bultaco49 Quote Link to comment Share on other sites More sharing options...
bogwheel Posted July 21, 2009 Author Report Share Posted July 21, 2009 Thanks for your input. I will go to a lower grade oil @ 180cc first. I have the top nuts with valves fitted - i thought this was only to let built up air out - is this correct, or is there another purpose please? Quote Link to comment Share on other sites More sharing options...
pedronicman Posted July 31, 2009 Report Share Posted July 31, 2009 Hi bogwheel , the fork caps with air valve are ONLY to let air OUT NEVER pump them up- you will blow the seals!! STD fork oil for a sherpa is 15wt , but you need to try different weight to suit your liking. Quote Link to comment Share on other sites More sharing options...
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