mur Posted October 3, 2014 Report Share Posted October 3, 2014 hi guys a wee question i have been getting a bit of rebound last couple of trials ,moving quickly over rutted ground say,but nothing when lifting in a section --- the springs are recent and the longer type (happy with them) oil 15wt newish 180cc seals fine everything tightened down. this bike is trialed every week my question is ----how much oil do i lose (fine mist)through the valves? more than i thought maybe,have topped up with 25cc more any thoughts on this ,will know better after sun. cheers mur ps sherpa Quote Link to comment Share on other sites More sharing options...
suzuki250 Posted October 3, 2014 Report Share Posted October 3, 2014 A minute amount you would lose more past the seals or leaking from the bolt at the bottom. Even new seals leave a fine layer of oil on the forks Quote Link to comment Share on other sites More sharing options...
breagh Posted October 3, 2014 Report Share Posted October 3, 2014 When I saw video footage of you upside down in that stream last Sunday Mur I didn't consider this fork issue a priority! There may be lack of fluid in your forks but there was plenty everywhere else apart from the gearbox and primary which probably drained out the breathers into the streams nailing Kelvins prize carp. Anyway every Bultaco should be treated like that,mine too if I can ever get it running again.. 1 Quote Link to comment Share on other sites More sharing options...
lbhbul Posted October 3, 2014 Report Share Posted October 3, 2014 (edited) Mur, shouldn't think you would lose that much oil unless it was upside down. If you have the vented caps, you can turn the stanchions so the vent holes are towards the tank and you will be able to track the spray if there is any. Will try to help if possible. By the way what model do you have? Regards Larry Edited October 4, 2014 by lbhbul Quote Link to comment Share on other sites More sharing options...
guys Posted October 3, 2014 Report Share Posted October 3, 2014 If the valve is ok, you shouldn't lose any oil i.m.o. I also had a mist of oil when the forks compressed but this was due to a bad sealing (one way) valve. 1 Quote Link to comment Share on other sites More sharing options...
mur Posted October 4, 2014 Author Report Share Posted October 4, 2014 breagh ---are you the all seeing eye of the trials world !!! i definitely get a fine mist on big compression ---do these vents only breath one way ?? the wee nut inside, below the washer, is not tightened right up, i thought this was to allow the valve to breath ---is that not the case? larry it is a 199a but a 159 frame 350 sherpa kind regards mur Quote Link to comment Share on other sites More sharing options...
lbhbul Posted October 4, 2014 Report Share Posted October 4, 2014 Mur, I don't remember for sure about the tightness, seem to remember when new, they are bradded slightly and not tightened up so as you thought, to allow them to breathe. I think but will check later that they work both ways. Had a chassis upside down not long ago and cleaned up two puddles, had not cleaned the caps, however not thinking there is any check valve. Will check one later and amend post as needed. Regards, Larry Quote Link to comment Share on other sites More sharing options...
guys Posted October 4, 2014 Report Share Posted October 4, 2014 The wee nut is not tightened up because there's a wee spring under the wee washer. It works like a wee one way valve as I stated before. When my fork cap created a mist at compression, it was because the washer that seals against a rubber, was corroded. After polishing the washer the mist was gone and everything was clear again Quote Link to comment Share on other sites More sharing options...
lbhbul Posted October 4, 2014 Report Share Posted October 4, 2014 Mur, for what its worth just took caps off 199. Small nut, down tight; washer; spring; thin washer with I/D to accommodate step and to cover 4 slots. Regardless of what the spring and washers do, if they don't hiss on compression the caps are not doing what they are supposed to do. Let them breathe! Some A models have a deflector in the bottom of the spring to alleviate the oil spray from the dampers. Regards Larry Quote Link to comment Share on other sites More sharing options...
mur Posted October 5, 2014 Author Report Share Posted October 5, 2014 thanks again guys ,the washers dont look to bad -------------maybe just got a bee in my bonet about this,seems the caps are working ok and doing their job--- bloody rebound thought!!!! might be technique !!! thats needed cheers the noo!! mur Quote Link to comment Share on other sites More sharing options...
lbhbul Posted October 5, 2014 Report Share Posted October 5, 2014 Mur, one thing you might try to calm the rebound, I had the same problem with a friend & pursang springs, was able to make him happy by changing to 30 weight oil in one leg. Doesn't cost much to try. Let us know how you get on. Larry Quote Link to comment Share on other sites More sharing options...
smelling123 Posted October 5, 2014 Report Share Posted October 5, 2014 Or try the magical springs, seem to stop that nasty topping out Quote Link to comment Share on other sites More sharing options...
mur Posted October 5, 2014 Author Report Share Posted October 5, 2014 well -------------my performance on the bike was mince!!! however little to no rebound a bit firmer fork, but i can live with that. whenever rebound occurs again i will know to top up!! thanks again for your time guys-- will maybe try heavier oil next time larry. cheers the noo!! mur Quote Link to comment Share on other sites More sharing options...
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