Iam putting a set of Vance and Hines Straight Shots on a 04 1200c. I was wondering what size jet I should use and what size is stock. Can anybody help me? I have asked this before and nobody could help me.

 

I have an '05 model 1200C and it had a size 42 jet stock. Iinstalled a Screamin' Eagle hi-flow kitand took the baffles out of my pipes so I obviously needed to rejet. I went to the Harley shop and they told me I would need a size 45 jet so I bought it. I got home, installed it, cranked the bike up and it was still a little lean. Itcontinued torun like crap (hesitation, carb farts, etc...)after warm up so I called around and got word that it needed a size 48 jet, rather than a size 45. I bought the 48 and installed it and it runs much better. I'm not sure if you have upgraded the intake on it, or if you plan to, but if so, I would go with the 48 jet. It's always better to get the bigger size now and run a little rich, until you upgrade the intake, than it is to run lean.

Just a piece of advice...beextremely careful when removing the float bowl from the carb. Thefour phillips-head screws that hold it onsuck and they will stripvery easily.

I hope this helped...

 

You're really asking a question that has no right answer. Changing the exhaust alone will have only a minor, if any affect on your air/fuel mixture. In order for a freeer flowing exhaust system to produce any significant performance improvement,a freeer flowing air intake, can & filter, are required. Your jet sizes will be much more dependant on the A/C you choose than your exhaust system. You will read about people here doing "Stage 1" to their bikes. It'sreally a "package" that includes exhaust, A/C can & filter, and either rejetting (carb)or remapping (for EFI). Your bike also has 2 jets,a Pilot jet & a Main jet. I'm currently running a 46 Pilot & 180 Main jet but that would not apply to your bike with a stock A/C and these jet sizes were determined from having the bike dyno tuned.

 

cHarley is right, the pilot jet is the one I was talking about in my post above. I didn't touch the main jet at all.

 

Where you live also makes a difference as air at higher altitudes is less dense. You should add your location to your profile.

 

If you want to make a "stab in the dark" you could probably change the Pilot jet to a #45. I believe if you still have the stock jets your existing Pilot jet is a #42 and that size is lean even for a stock bike. See here for instructions if you haven't done so. https://www.hdforums.com/m_1627013/tm.htm

 

42

 

I also first added just the pipes to my bike. I didn't do anything to the carb, and she ran just fine. If anything a bit better. I only started working on the carb after I took the sock outta the Pig's mouth. (replaced the air cleaner)

 

I'm with group A. I don't know.

 

Buy a 45 and a 48 pilot jet.Make sure you go buy 4 stainless steel allen head screws to replace the existing ones on the float bowl.Drive it with the 45 and if needed step up to the 48.On the newer models it can be done without removing the carb if you are not drilling out the mixture plug.Ten minutes with allen head screws to switch over pilot jets.You will need to custom grind a screwdriver or buy the correct one.