N99, JJH & N68X Needles

[Vin]

Hi Guy's,

Can anyone tell me from richer to leaner what N99, JJH and N68X needles are please?

I've seen a few charts but it has left me more confused

[headcoats]

I gave up on the JJH Vin on the LC and went to N68A

Ran better but like you say confusing as feck

Trial and error by me but I would love someone to get all the different ones measured and compared [-o<

Question to me is why does everyone say use JJH ???

[dave32]

Im pretty sure the N68's are richer in overall than the 99's,i think the 68 denote's the diameter so it will be narrower so giving a richer mixture.
i think the tapers the same.
I maybe wrong of course,
I've got both so will have a look and see for sure.
Is it for a KR1 or are they fitted to an LC or such?
If they are then it's really a case of just trying different setting's to suit.
Strange though,i fitted them to my 350LC ,160RD main,N99 on the 4th airscrew 3/4 out and it runs great.
Dave

[Vin]

I gave up on the JJH Vin on the LC and went to N68A

Ran better but like you say confusing as feck

Trial and error by me but I would love someone to get all the different ones measured and compared [-o<

Question to me is why does everyone say use JJH ???

I'm glad it's not just me then

I will see if I can get them measured at work and reply with my findings!

[Vin]

I've got both so will have a look and see for sure.

That would be great if you can?

[headcoats]

Tuned LC with Ramairs

152.5 mains
45 pilots
1 1/2 airscrew
N68A on middle clip

Had them on 4th but left pot developed machine gun stutter on part throttle and lowering the needles sorted it

[nikfubar]

Agree I have never been able to get mine to run right on the JJH so fitted the 68X needles on middle clip & it runs great. pretty sure the 68 is leaner needle than the JJH the top section is the same but the 68 has a fatter taper making it leaner.