klonheadd Posted October 18, 2016 Report Share Posted October 18, 2016 Hi all , I have finally invested in Bosi/arrow exhaust for my Beta 4t Evo 300 2012 and have question about jetting. Could I use it without changing any jets or settings on carburretor ? and to get best performance, what jets and settings would I need to change. Can anyone with experience chime in. Thanks! Quote Link to comment Share on other sites More sharing options...
timdog Posted October 18, 2016 Report Share Posted October 18, 2016 I have one on my bike, didn't change anything and runs great. Interesting to see if anyone has made changes but I presume it only changes the gas flow out. Quote Link to comment Share on other sites More sharing options...
timdog Posted October 18, 2016 Report Share Posted October 18, 2016 P.s. I know of two others who say the same, haven't changed anything just plus n go Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted October 18, 2016 Report Share Posted October 18, 2016 "Changing the gas flow out" as you put it usually weakens the mixture. There may be undesirable long term effects - worth checking for this, how does the plug look? Quote Link to comment Share on other sites More sharing options...
jfc Posted October 18, 2016 Report Share Posted October 18, 2016 I am using the beta factory tail pipe completely changed the bike without any change to jetting! Enjoy!! 1 Quote Link to comment Share on other sites More sharing options...
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