N99, JJH & N68X Needles

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Vin
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N99, JJH & N68X Needles

Post by Vin » Mon Jun 03, 2013 9:09 pm

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 #-o :lol:

headcoats
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Re: N99, JJH & N68X Needles

Post by headcoats » Mon Jun 03, 2013 10:45 pm

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

Ran better but like you say confusing as feck #-o

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 ???
Can it yer old boiler

dave32
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Re: N99, JJH & N68X Needles

Post by dave32 » Tue Jun 04, 2013 12:46 pm

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, :lol:
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
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Re: N99, JJH & N68X Needles

Post by Vin » Tue Jun 04, 2013 9:23 pm

headcoats wrote:I gave up on the JJH Vin on the LC and went to N68A :shock: :shock:

Ran better but like you say confusing as feck #-o

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 :lol:

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

Vin
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Re: N99, JJH & N68X Needles

Post by Vin » Tue Jun 04, 2013 9:25 pm

dave32 wrote:
I've got both so will have a look and see for sure.
That would be great if you can?

headcoats
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Re: N99, JJH & N68X Needles

Post by headcoats » Wed Jun 05, 2013 11:34 am

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
Can it yer old boiler

nikfubar
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Re: N99, JJH & N68X Needles

Post by nikfubar » Wed Jun 05, 2013 9:05 pm

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. 8) 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.

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