jet needles

[Delbert]

Hi
I have two sets of 4l1 carbs both fitted with 5k1 needles although the book states 4n10 , were they superseded by these ? Are they still available ? Any one know what /if any difference they would make . Currently running 250 carbs on my 350 with the 5k1 needles seems to run ok to me although I had to down jet to 170 mains , wich I thought a bit strange , possibly affected by the needle ? Any thoughts chaps

[garyt]

250lc = 4N10
350LC early = 5GN36
350LC later = 5K1
31k = 5K1
1ua = 5L20

[Delbert]

Thanks for replies ,encouraging to know im not the only one to down jet , I guess if it works why fix it . It can be a bit hollow in the mid range but Thats probably the norm .