Originally Posted by mxfred
I would also like to know i have same engine. I belive it is option LSN and the shape of it looks like it is to lean the mid. But im not gonna gamble on it
The short needle will give you a smoother powerband with less fuel consumption. The blunt needle will be more aggressive, and drink more fuel.
There is also another fuel inlet nipple for the carb that is bigger, that of course, will add power at the expense of fuel consumption.