03 FXD need CV jet help!
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Stage II
Joined: May 2006
Posts: 2
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03 FXD need CV jet help!
I have a 2003 FXD it was jetted with a 48 slow jet and a 195 main. Stock except for a SE filter kit and SE II exaust.
I Dynoed the bike and it showed the low end lean Air/Fuel 15 to 1 the mid range was perfect and high end lean Air/Fuel 14.5 to 1. 69.11 HP / 76.3 TQ
Would it be wise to change the slow jet to #50 and the main jet to #200?
Is this jetting normal for a stock twin cam or larger than normal?
Cheers
acp63
I Dynoed the bike and it showed the low end lean Air/Fuel 15 to 1 the mid range was perfect and high end lean Air/Fuel 14.5 to 1. 69.11 HP / 76.3 TQ
Would it be wise to change the slow jet to #50 and the main jet to #200?
Is this jetting normal for a stock twin cam or larger than normal?
Cheers
acp63
Outstanding HDF Member
Joined: Nov 2006
Posts: 2,203
Likes: 2
From: Pittsburgh, PA
RE: 03 FXD need CV jet help!
Hi,
I do not recall the original numbers of the slow jet and main jet in my 2003 FXD. I had a Dynojet kit installed prior to delivery of the bike.
I do have a post in the Forum regarding my dyno run however. It may help in the long run as I am going to open up my CV to seejust what is inside it, as the dyno chart shows a lean condition even with the Dynojet installed.
https://www.hdforums.com/m_1019037/tm.htm
I do not recall the original numbers of the slow jet and main jet in my 2003 FXD. I had a Dynojet kit installed prior to delivery of the bike.
I do have a post in the Forum regarding my dyno run however. It may help in the long run as I am going to open up my CV to seejust what is inside it, as the dyno chart shows a lean condition even with the Dynojet installed.
https://www.hdforums.com/m_1019037/tm.htm
Road Master
Joined: Jul 2005
Posts: 916
Likes: 3
From: Mauldin, SC
RE: 03 FXD need CV jet help!
Stock jets were 45 slow and 190 main. A 50 and 200 would be considered very abnormal with what you have. Most people get good results with stock jets and the 27094-88 Sportster needle. The straight part of the Sporty needle is richer than stock and makes a difference up to about 1/4 throttle. I ran the stock jets and Sporty needle in my '03 Dyna for 3 years until just recently, swapped it for a Mikuni. I'd be checking for a vacuum leak at the carb to manifold or manifold to head seals.
Did your dyno operator suggest anything? A WOT dyno run isn't necessarily a good indication of anything other than the main jet.
Your peak hp and torque are about where they should be. What does the torque curve look like and how does the bike run?
Did your dyno operator suggest anything? A WOT dyno run isn't necessarily a good indication of anything other than the main jet.
Your peak hp and torque are about where they should be. What does the torque curve look like and how does the bike run?
Tourer
Joined: May 2006
Posts: 319
Likes: 0
From: Cape Coral, FL
RE: 03 FXD need CV jet help!
You did not mention in your post, and if you haven't yet, pull the plug and adjust your fuel mixture screw, that will take care of it. 48 is plenty large pilot and should not be the problem, most go from 45 to a 46 with no issues.
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