slik Posted June 16, 2015 Report Share Posted June 16, 2015 Hello from Greece . Just bought a jotagas 300 , 2014 . I would like to ask a standar jetting for the dellorto 26 carb ( main jet , pilot jet , needle .... ) , so i can adjust it . It is not absolutely clear in low raves . Thanks a lot , Stathis . Quote Link to comment Share on other sites More sharing options...
gasgas249uk Posted June 16, 2015 Report Share Posted June 16, 2015 Slik, The main jet is 120 and the pilot is 35. I havent got the needle number but im guessing yours will be standard. Run 70/1 on synthetic 2 stroke oil . Quote Link to comment Share on other sites More sharing options...
slik Posted June 16, 2015 Author Report Share Posted June 16, 2015 Thank you gasgas249uk . Any other information for jetting is welcome . Why 70/1 ? The manual gives 100/1 . Quote Link to comment Share on other sites More sharing options...
gasgas249uk Posted June 16, 2015 Report Share Posted June 16, 2015 70/1 was what was recommended to me. Mine runs cleanly and i dont believe / have the confidence that oils have developed so much that 100/1 is safe. Oil , exhaust , air filters companies rely on the naive to pay their xmas bonus'. Its common for some people to find that the bottom end isnt quite as clean as a gasser for instance. Its just the way it is. Try removing any heavy oiling from your air filter . That might help. The Keihn sorts it completely , but it also makes it quite a bit more powerful Quote Link to comment Share on other sites More sharing options...
peterh Posted June 17, 2015 Report Share Posted June 17, 2015 Slik (Stathis) - I have a 2014 250 (NOT a 300) but here are my jet sizes for the Dellorto: Main 120; Choke 60; Pilot 35; Needle valve 200, Needle D36, and slide 60 - if my eyesight is good enough. I did fit Boyesen Dual Stage Reeds - had used Boyesens in other bikes and liked the results. So fitted them to my Jotagas. In fitting the Boyesen Reeds I also dropped the needle by one clip and set the mixture screw accordingly. After suggestion from Australian Distributor we have been running the Champion RCJ8Y and after trying both the recommended NGK BPMR6Y and the Champion and swapping between them, am confident that the Champion does make a difference in making the response crisper in that just off idle gentle twist of the throttle. After telecat (on the forums here) suggestion, I have opened up the plug gap to 0.93mm. I think this does make a slight difference. I am going to try an NGK BPMR6Y plug with the grooved centre electrode - just because I thought I would. I do run 100:1 using 98 Octane. I have a nice coffee coloured spark plug through the full range. I do like to give the bike a good run up a track at end of practice or a trial to reduce build up of residue oil in exhaust and clean the plug of any soot - particularly if practice is lots of just off idle riding - or maybe I just like a good blast. I use the No-Toil air cleaner oil system which not only makes cleaning the air filter easy (and therefore no excuse for not cleaning it very regularly) but also easy to work with to get a nice even oil spread through the filter and not over oil the filter. Mine runs crisp and no longer has the slight fluttery feeling just off idle. It is a great bike and very happy with it. Quote Link to comment Share on other sites More sharing options...
slik Posted June 17, 2015 Author Report Share Posted June 17, 2015 Thanks for all that information Peterh ! i also have a coffee coloured spark plug , but i am not fully contented . The previous owner made some changes to the carb . I have to find them and fix it ( pulled out the main get , says 105 and i messured it and its 140 ! , so i changed it with a 120 ) .) I wiil try buy the Boyesen Reeds and try the Chapion plug . I also like to clean the air filter after every ride . I love the bike too . My bigger problem is that i broke my toe and now i have to wait 3 weeks before i can ride again . So now its an opportunity to set the bike ! Sorry for my bad english ..... Quote Link to comment Share on other sites More sharing options...
peterh Posted June 17, 2015 Report Share Posted June 17, 2015 All the best with sorting it out and with the healing of your toe. Your English is far better than my Greek so no need to apologise. Quote Link to comment Share on other sites More sharing options...
trialsriderfeetup Posted March 22, 2023 Report Share Posted March 22, 2023 any one know the jetting numbers for a 300 jotagas 2014 with a PWK Keihin carb. a 45 pilot is in at the moment.and for it to run something like mixture screw is right in to the stop. Quote Link to comment Share on other sites More sharing options...
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