Jet Question

Energy One

Brock

Member
Greetings, brothers of the wind:roll: . Thanks so much for all of the friendly and funny responses. You seem like a great bunch of people, and I wish I could meet you all in person and ride with you. Here's my first technical question. As I stated in my introduction, I am currently running a modified chromed S&S high performance Super G carb. along with a D&M Twister air cleaner, and the stock exhausts on my 2007 K9. She isn't running as well as I would like her to, and based on your responses and my research, I do believe that I can get her running great with the less restrictive V&H Big Radius exhaust, and a great mechanic who has the skill to jet her properly and adjust the carb correctly. Now keeping in mind that I have a modified chromed S&S high performance Super G carb., which I believe sprays a greater flow of fuel to the engine?, can you tech wizzes tell me which jets will work best with this particular combination? Thanks so much for your help. Peace--Brock.
 

horse

Member
I have just been through the same issue of jetting my bike to suit the D&M. i was nearly about to put the air cleaner in the bin but now have it running real good. I have a 124 with V&H Big Radius pipes and are at sea level and here is my jet sizes.

31 slow jet
48 air jet
78 main
 

Brock

Member
Thanks for the great advice Horse. Beautiful bike you have. Is your engine, and carb the same as my 2007 K9 for an accurate comparison? Please be patient with me, as I'm no tech wizard. Thanks--Brock.
 

horse

Member
My engine is a little bigger 124cu in compared to your 117 (at a guess I am not a big dog expert)
My carb is a chromed S&S Super G, D&M spike, V&H Big radius (standard baffles).

If you try the jets I mentioned I would say you will be either spot on or 1 size either side. We mucked around on the dyno but in the end the best tuning (with the D&M) was done on raod testing.

Hope this helps
 

LamboV12

Active Member
I ran Big Radius with stock jets at first. Then, the kit Big Dog sells for Big Radius:
"This recommended jet kit will provide optimum performance out of your S&S G carburetor when installed with our Big Radius exhaust system. Kit includes .076 main jet and .031 intermediate jet. [Part No. 103-000032-00]"
 
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