db_89 Posted June 16, 2016 Report Share Posted June 16, 2016 sorry for all the questions but i thought id be better put them in one thread. iv bought my first trials and its a 1998 gas gas tx 270 contact,im completly clueless so need to ask a few questions. premix ratio? i was told approx 75mls to 5ltrs? tyre pressures front and back? gear oil grade and how many hourly service the previous owner has a KnN 4stroke cone filter on it and the airbox is gone,is there anyone with a secondhand airbox or is there any trials breakers in the uk thanks for your help derek Quote Link to comment Share on other sites More sharing options...
heffergm Posted June 16, 2016 Report Share Posted June 16, 2016 premix, 80:1 tire pressure, in the region of 6-7psi front and 3.5-4 in the back I run 75W gear oil, in the GG, but a lot of people run ATF and you'll get a million opinions. If you use ATF, change it often. I do every 10 hours. Quote Link to comment Share on other sites More sharing options...
db_89 Posted June 16, 2016 Author Report Share Posted June 16, 2016 premix, 80:1 tire pressure, in the region of 6-7psi front and 3.5-4 in the back I run 75W gear oil, in the GG, but a lot of people run ATF and you'll get a million opinions. If you use ATF, change it often. I do every 10 hours. your a star!! what type atf would i use? dex 2 mineral or dex 3 synthetic ? there is atf in it now and she crawls on slightly when cold Quote Link to comment Share on other sites More sharing options...
heffergm Posted June 16, 2016 Report Share Posted June 16, 2016 Make sure the clutch lever is adjusted correctly. When it's all the way to the grip there should be no drag, then you should start to feel the bike want to creep forward just as it comes off the grip. No idea on the ATF, but try http://www.trialscentral.com/forums/topic/42006-best-oil-for-gas-gas-pro/ Quote Link to comment Share on other sites More sharing options...
glynn Posted June 16, 2016 Report Share Posted June 16, 2016 (edited) NEVER use synthetic ATF, clutch may feel nice for a while, but will stick, slip, drag and I just had endless trouble with it (putoline synthetic ATF), It also made my plates swell. Now I have new plates and run 15W40 with no problems, your bike is a pre Pro so has a regular design clutch, unlike the diaphragm clutch in the Pro, so you should have no problems with 10W40, I wouldnt run ATF if I was you, its a common trick to eliminate drag in the Pro clutch which your bike should not have. Edited June 16, 2016 by glynn Quote Link to comment Share on other sites More sharing options...
cbutler Posted June 16, 2016 Report Share Posted June 16, 2016 http://www.ebay.com/itm/1999-GAS-GAS-TXT-CONTACT-AIRBOX-ASSEMBLY-WITH-FILTER-/231894791017?hash=item35fe01b369:g:7xcAAOSwIwhWSHQV Should be the same Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted June 17, 2016 Report Share Posted June 17, 2016 Best is 10W30 Quote Link to comment Share on other sites More sharing options...
reggie Posted June 17, 2016 Report Share Posted June 17, 2016 I believe the airbox changed for 1999. Quote Link to comment Share on other sites More sharing options...
shercojon Posted June 18, 2016 Report Share Posted June 18, 2016 Trials breakers - 07835 233083 . Ive never used them but clocked their ad. (Rawtenstall, Lanc's) Quote Link to comment Share on other sites More sharing options...
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