Hmm - OK. I know the previous distributor in the US opted for a short LSN carb for the US motors, to fall into line with other brands on the market.
To the best of my knowledge the GO factory normally puts the longer tapered LSN (that stays in the spray bar up to full throttle) as a standard on their motors. All the motors distributed in the Sount Pacific have always come with the longer needle since it was introduced.
You can't tune a long needle carb in the same manner as a short needle one.
You will end up with massive lean bog. What happens is people normally end up with a way too lean HSN and a very rich LSN, along with an idle gap that is too big which masks the very rich bottom end. The motor will run "sort of" OK like this, but will get very hot at the end of a tank and never achieve full performance.
Check the needle situation out Trey, just in case you have a mixture of the two. You wouldn't want any customers being put off these great motors because of a little hiccup like that