I have had a varriety of mid 80's sleds with Mikuni carbs,
but the ones in question are 1986 safari 377s.
i am used to the jet being about 1 3/4" long(on just about every sled ive worked on)
my 86 377 is just like that, but i am helping my neighgbour work on his 86 safari 377(identical to mine) and the jet in his is about 3/8" long.
Ive never seen one so small, i dont understand jetting, so im looking for a quick rundown,
ps.. we are in the rocky mountains, i believe a fare elevation, mine runs great, his wont idle, both are single carb setups.