Does anyone understand jet needle numbers? I have a customer who asked if I can order a new carb for his '82 340 Trailfire. No problem, except the original 6F27 jet needle is no longer made. I am trying to figure out what is the closest replacement.
Here is a PDF from Mikuni's web site explaining the Jet Needle specifications: http://www.sudco.com/vol33/56-59.pdf
So the 6F part is no problem, but there is nothing anywhere near the 27, which I believe is the angle of the taper.
Jet Needle Numbers
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Matt
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Jet Needle Numbers
Last edited by Matt on Mon Dec 31, 2012 8:14 pm, edited 1 time in total.
Reason: I wrote needle jet when I'm actually talking about the jet needle
Reason: I wrote needle jet when I'm actually talking about the jet needle
Matt - JDsleds.com Administrator-
Matt
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Re: Needle Jet Numbers
JD fine tune manual says the letter is the taper angle and the number is:
"7 - Material, typeof coating and start of second
taper on needle."
This is a single taper, and I doubt 27 refers to a type of coating unless that's just the 7 and the 2 means something else....ugh.
"7 - Material, typeof coating and start of second
taper on needle."
This is a single taper, and I doubt 27 refers to a type of coating unless that's just the 7 and the 2 means something else....ugh.
Matt - JDsleds.com Administrator-
Danzig
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Re: Needle Jet Numbers
I checked my aaen carb book and it does not show this either.
1973 JDX8
1978 Liquifire 340
1980 Liquifire 440 CC Racer
1980 Liquifire 440
1982 Liquifire 440
"Gotta Lick It Before You Stick It"
1978 Liquifire 340
1980 Liquifire 440 CC Racer
1980 Liquifire 440
1982 Liquifire 440
"Gotta Lick It Before You Stick It"
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ICCSF 108
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Re: Jet Needle Numbers
Matt in my Trailfire parts book ( Dec 78 ) the 6F27 is for a 440 & a 6FL14 is for a 340? I guess they were updated to the 6F27as my 79-83 fine tune manual shows the same as your looking for used in ALL Trailfires.. I might be able to get a 6FL14? can't ck until Wed..
Personally I don't think he will ever notice the difference in performance or fuel leanness if you get a M69074 ( 6DH22 ) or a M67634 ( 6DP5 )... 6DH22 if I read the FTM right should be richer.... both of which I think can be purchased..
Needle jet
6 = basic length of needle
D = single taper ( single letter )
DH = double taper ( 2 letters )
7 = the Material, type of coating & start of second taper on needle ( not
sure on Double Letter Needles if 22 would be higher or lower of the start of the second taper than the 7 would be?? )
Grumpy
Personally I don't think he will ever notice the difference in performance or fuel leanness if you get a M69074 ( 6DH22 ) or a M67634 ( 6DP5 )... 6DH22 if I read the FTM right should be richer.... both of which I think can be purchased..
Needle jet
6 = basic length of needle
D = single taper ( single letter )
DH = double taper ( 2 letters )
7 = the Material, type of coating & start of second taper on needle ( not
sure on Double Letter Needles if 22 would be higher or lower of the start of the second taper than the 7 would be?? )
Grumpy
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
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Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
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jdsledsrgr8
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Re: Jet Needle Numbers
Along these lines, last year on the challenge I needed some help with jetting. Brian 400 had a really nice little jetting kit that all all sorts of sizes. It was about the size of a box of cards. I would like to get one of these? Are they available and where can they be purchased?
Mt. Horeb WI
1976 Liquidator
1976 Liquidator Clone
1978 Liquifire 440
1976 Liquidator
1976 Liquidator Clone
1978 Liquifire 440
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Matt
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Re: Jet Needle Numbers
There is a case in my supplier's catalog that holds 22 main jets and a tool for them, and you just order whatever jet sizes you want. The case is $6 and the main jets are $3.70 a piece.
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Matt - JDsleds.com Administrator-
400brian
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Re: Jet Needle Numbers
That's the one that I have. The problem I have now is that I can't read the numbers on the jets without a magnifying glass! 
'09 Vintage Challenge Survivor, and I wasn't late for supper!
'10, '11, '12, '13,'14,'15,'16,'17, '18, 19, 20, 21, 22 Vintage Challenge Survivor !
72 400 restored, Father bought new in '71
73 X8 restored
'74 340 green machine
'74 X8 9 time VC finisher
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2 '75 340S 1 running, one on deck
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jdsledsrgr8
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Re: Jet Needle Numbers
Thanks Matt. So if I email you the main jet sizes I desire you can order them along with the case?
Mt. Horeb WI
1976 Liquidator
1976 Liquidator Clone
1978 Liquifire 440
1976 Liquidator
1976 Liquidator Clone
1978 Liquifire 440
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sledder670
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Re: Jet Needle Numbers
this is from western power sports catalog
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I buy sell and service all brands. Contact me and i might be able to help. sleds 2-liquidators, 75 340/S, 80 liquifire, 78 440 liquifire, 75 jd 300, 83 9700 skidoo blizzard, 86 skidoo formula plus, 79 motoski super sonic, 91 skidoo mach 1 x, 92 formula plus x, 95 mxz 440, 3 toni hiakonen edition mxz's, 98 mxzx, 97 mxzx, 77 skidoo rv cross coutry, 77 skidoo Rv 340, 75 skidoo tnt 340FA, 97skidoo formula3LT, 06 800 skidoo summit, 08 skidoo tnt full trail mod with nos
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jdsledsrgr8
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Re: Jet Needle Numbers
Ok finally got some time to tackle this.
So I have a cyclone, 295s and liquidator. In stead of me looking through all the charts I bet you guys can raddle them off the top of your head. If you were going to fill this box with jets which ones would you do so with?
So I have a cyclone, 295s and liquidator. In stead of me looking through all the charts I bet you guys can raddle them off the top of your head. If you were going to fill this box with jets which ones would you do so with?
Mt. Horeb WI
1976 Liquidator
1976 Liquidator Clone
1978 Liquifire 440
1976 Liquidator
1976 Liquidator Clone
1978 Liquifire 440