mcferreira100 Posted October 30, 2013 Share Posted October 30, 2013 Ok I give up..where are the XT experts out there? Looked up and down the manual but can`t find something relating to carb airscrew adjuster. Have to ask where is this adjusting screw. Idling ok but the bike is missing like crazy soon as revs pick up. I still plan to give it a good service but thought would check air adjustment so long. I`ve noticed a large screw under the throttle body of the carb on left side..is this it..and what is the spec? Link to comment Share on other sites More sharing options...
Tommy10bikes Posted October 30, 2013 Share Posted October 30, 2013 Posted on the other site but yes the large screw at the bottom of the carbhe one you cant get to for burning your fingers on the exhaust is the air mixture screw. One important thing is the make sure the o ring between the bowl and the main carb body is good and not missing, also worth checking that the fuel pump is working and the diaphragm is OK.Sounds like it running week if its missing at high rpm.TTB Link to comment Share on other sites More sharing options...
mcferreira100 Posted October 31, 2013 Author Share Posted October 31, 2013 I see the pump sits at the bottom of the carb(very different to the 500). The previous owner tells me he had this carb overhauled by somebody so I would think it shouldn`t look too bad inside. But I have noticed this dodgy looking piece of wire to the pump..I see it actuates the arm..surely this is not right and can be causing issues? Link to comment Share on other sites More sharing options...
mcferreira100 Posted October 31, 2013 Author Share Posted October 31, 2013 I see this is what it should look like..the whole rod assembly is missing. Link to comment Share on other sites More sharing options...
Tommy10bikes Posted October 31, 2013 Share Posted October 31, 2013 Yes there is a fair bit missing , this is what it should look like. TTB Link to comment Share on other sites More sharing options...
mcferreira100 Posted October 31, 2013 Author Share Posted October 31, 2013 It looks like its an adjustable rod. Are there settings for it in the manual? Link to comment Share on other sites More sharing options...
slice Posted October 31, 2013 Share Posted October 31, 2013 Almost certainly will be a table of settings in the manual, usually under the TUNING heading, best you can do is have a look on Google and see if there is anything online that can help you out. You might be lucky and find a PDF file that you can download or sort through. Link to comment Share on other sites More sharing options...
mcferreira100 Posted November 1, 2013 Author Share Posted November 1, 2013 So I`m wondering how come the 250 had this accelerator pump on it but not the 500? These bikes were from same era. Link to comment Share on other sites More sharing options...
Tommy10bikes Posted November 1, 2013 Share Posted November 1, 2013 The later XT and most of euro models had pumper carbs , US model was 80 or 81 onwards for the pumper carb. TTB Link to comment Share on other sites More sharing options...
mcferreira100 Posted May 13, 2014 Author Share Posted May 13, 2014 Anybody know the setting for the air mixture screw?..can`t find it in the manual. Link to comment Share on other sites More sharing options...
YPVS TONE Posted May 14, 2014 Share Posted May 14, 2014 Got a UK data book that say's for the XT250 from engine number 3Y3-000101 and from 3Y3-0035101 airscrew turns out = 2 and 1/2. Tony Link to comment Share on other sites More sharing options...
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