Originally Posted by
grizz1
For a little while GO bought out an "intermediate LSN needle", which is probably what you have there. They will work fine. As long as the LSN pulls out of he spray bar at or before full throttle, the engine will tune like most other engines out there with predominantly the HSN, as opposed to the LSN style tuning of the longer needle version carbs.
1.42" is the length of the original (around Gen 3) short LSN. This is the measurement I used after reading Rex's (22Racer) original post, an it works a treat.
The short LSN (GOT21-2003) and the one Rex modded in my 3-Port Sport are very close in length. I haven't taken the one out of the 3-port, but with the slide at full open both LSN are about halfway across the opening of the carb.