Originally Posted by
prettyboy
I have a question ? Ive been reading on here about the lsn sizes that there is a short and long one. Does this also pertain to the GO .25 ? And if I have the long lsn in my .25 should I cut it down ? How long is the long lsn and what should be the size after cutting it ? Will this help with tuning on a GO .25 motor ? Thanks for the info guys...
Not sure about the .25 but I would think it would work just the same as the .21's.
Standard long needle is 1.6" long. Shorten it down to 1.42" and round off to a bull nose end, as opposed to the thin taper of the long needle.
Short needle will be easier to tune if you are used to tuning other engines like OS etc. I have run both, and IMO the long needle gives a smoother power band, and slightly better economy. Just a little tricky to get right until you get the hang of it.