Harley Davidson Forums

Exhaust System Topics New and old exhaust system discussions. Fitment issues to sound bites and suggestions. Post them here.

Jet Sizes

Thread Tools
 
Search this Thread
 
Old Mar 11, 2006 | 12:51 PM
Share
  #1  
cootertwo's Avatar
cootertwo
Thread Starter
|
Cruiser
Joined: Mar 2006
Posts: 186
Likes: 0
From: S.W. Florida
Default Jet Sizes
Is there a chart somewhere that gives the main and slow jet sizes in 1000ths of an inch?
 
Reply
0
Old Mar 11, 2006 | 01:42 PM
Share
  #2  
HDF Tech's Avatar
HDF Tech
Banned
Joined: May 2005
Posts: 14,496
Likes: 156
From:
Default RE: Jet Sizes
This may be of some help to you, althou they are not slow jets, just for comparison.

Keihin Jets -------- DJ Jets

Num / Thou. ------- Num / Thou.
92.5 / 0.035 ------- 92 / 0.035
95 / 0.036 ------- 94 / 0.036
97.5 / 0.037 ------- 96 / 0.037
100 / 0.038 ------- 98 / 0.038
102.5 / 0.039 ------- 100 / 0.039
105 / 0.040 ------- 102 / 0.040
107.5 / 0.041 ------- 104 / 0.041
110 / 0.042 ------- 106 / 0.042
112.5 / 0.043 ------- 108 / 0.043
115 / 0.044 ------- 110 / 0.044
117.5 / 0.045 ------- 112 / 0.045
120 / 0.046 ------- 114 / 0.046
122.5 / 0.047 ------- 116 / 0.047
125 / 0.048 ------- 118 / 0.048
127.5 / 0.049 ------- 120 / 0.049
130 / 0.050 ------- 122 / 0.050
132.5 / 0.051 ------- 124 / 0.051
135 / 0.052 ------- 126 / 0.052
137.5 / 0.053 ------- 128 / 0.053
140 / 0.054 ------- 130 / 0.054
142.5 / 0.055 ------- 132 / 0.055
145 / 0.056 ------- 134 / 0.056
147.5 / 0.057 ------- 136 / 0.057
150 / 0.058 ------- 138 / 0.058
152.5 / 0.059 ------- 140 / 0.059
 
Reply
0
Old Mar 11, 2006 | 06:48 PM
Share
  #3  
cootertwo's Avatar
cootertwo
Thread Starter
|
Cruiser
Joined: Mar 2006
Posts: 186
Likes: 0
From: S.W. Florida
Default RE: Jet Sizes
Thanks TCSTD, gives me an idea anyhow.....
 
Reply
0
Old Mar 11, 2006 | 06:50 PM
Share
  #4  
cootertwo's Avatar
cootertwo
Thread Starter
|
Cruiser
Joined: Mar 2006
Posts: 186
Likes: 0
From: S.W. Florida
Default RE: Jet Sizes
By that, I figger a 180 keihin would be .070 do you concure?
 
Reply
0
Old Mar 11, 2006 | 08:55 PM
Share
  #5  
HDF Tech's Avatar
HDF Tech
Banned
Joined: May 2005
Posts: 14,496
Likes: 156
From:
Default RE: Jet Sizes
ORIGINAL: cootertwo

By that, I figger a 180 keihin would be .070 do you concure?

That sounds about right.
 
Reply
0
Old Mar 11, 2006 | 10:06 PM
Share
  #6  
murphdog's Avatar
murphdog
Road Master
Joined: Jul 2005
Posts: 916
Likes: 3
From: Mauldin, SC
Default RE: Jet Sizes
Keihin jets are metric. A 190 is 1.9mm, a 45 is 0.45mm, etc.
Divide mm by 25.4 and you have inches.
180=1.8mm/25.4=0.0708".
45=0.45mm/25.4=0.0177".
 
Reply
0
Old Mar 12, 2006 | 12:08 AM
Share
  #7  
cootertwo's Avatar
cootertwo
Thread Starter
|
Cruiser
Joined: Mar 2006
Posts: 186
Likes: 0
From: S.W. Florida
Default RE: Jet Sizes
gotcha, thanks guys
 
Reply
0

Trending Topics

Old Mar 12, 2006 | 01:49 PM
Share
  #8  
h60mech's Avatar
h60mech
Cruiser
Joined: May 2005
Posts: 101
Likes: 0
From: South Dakota
Default RE: Jet Sizes
Can I piggy back on the original question. Jetting. I'm currently stationed overseas and changed my exhaust to staggard Hooker step tuned pipes. Can anyone guide me in the direction on what jet to use or what would be close? These Japanese techs did the 1000 mile check, said they adjusted the air mixture to compensate for the exhaust. Now it runs like C#@& in the cold weather. Had to re adjust it but still not the same. Can anyone provide info? Oh yes, dynos are few and far between. Thanks in advance

John
 
Reply
0
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Mar 12, 2006 | 07:32 PM
Share
  #9  
95BadBoy's Avatar
95BadBoy
Cruiser
Joined: Feb 2006
Posts: 148
Likes: 0
From:
Default RE: Jet Sizes
Sounds like you need to change the low speed 1 or 2 sizes up. Is it the factory carb ?
You didn't say. did they change anything inside?
 
Reply
0
Old Mar 13, 2006 | 07:36 AM
Share
  #10  
h60mech's Avatar
h60mech
Cruiser
Joined: May 2005
Posts: 101
Likes: 0
From: South Dakota
Default RE: Jet Sizes
Yes, it is a factory carb on a 05 fatboy. No they didn't change anything inside. Just turned the idle down and adjusted fuel mixture. In addition to the exhaust I have put the screaming eagle stage one on. Sorry about the delayed response. (Time zones). Thankyou for your reply.

John
 
Reply
0



Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 10:46 AM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE