Originally Posted by
Jaz240
as far as I know ( I've been wrong before
) You cannot interchange needles from a carb made for short needles, with long needles, nor vica-versa
I think they confirmed in the xzb thread that the body, slide and hsn etc were the same part numbers.. only the lsn and mid needle were different. So if the OS long needle and mid needle fit then it looks like the arrow ones will too... Totally untested of course so don't take my word for it. I do know the arrow needles screw into the 21J body ok.