October 18, 20169 yr 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!
October 18, 20169 yr 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.
October 18, 20169 yr P.s. I know of two others who say the same, haven't changed anything just plus n go
October 18, 20169 yr "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?
October 18, 20169 yr I am using the beta factory tail pipe completely changed the bike without any change to jetting! Enjoy!!
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