Question about 2008 Harley Davidson FLHRC Road King Classic

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Honestly the best way to do it is t get the bike on a Dynomometer and have it adjusted that way to assure your HC (hydrocarbons) are in the 14.4 range, plus they can make sure you are getting the maximum horsepower out of all the money you put in to it.
Typically for the cost effective way is to get the disc or go to VH's website and see if you can download a map from there, but sometimes these can get you close, but not optimum.

Posted on Feb 16, 2010


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Diagnostic code of PO577 on a 2010 FLHX

Hi Anonymous, for more information about your question please visit the website below. Good luck and have nice day.
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Back fire with vance hines pipes

Sounds like it is running lean. The ECM must be remapped for a performance breather and/or free flowing pipes. I would use H-D Super Tuner or have a dealer do a digital download to remap the ECM properly for the changes you have obviously made. You may do great harm to your engine if you run it without the mapping change as the VE will be changed and the ECM doe not know what is physically going on with VE if it is not mapped into the ECM

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Whats the best after market slip on pipe for both power increase and a nice sound...i have been looking at a very reasonably priced Vance and Hines S4 for just $249?

Vance and hines is always a good choice of pipe, the nice thing about vance and hines is that you can back out the hex bolts on the back of the muffler and repack it when it gets old, or unpack it if you want it louader. Makes it quite tunable. I had a vance and hines 4-1 on my CBR 1000 and I was very satified. The price you are mentioned is good too. The V&E I had on my bike had a good sound at idle and rev and sounded awesome when I tached the bike up.

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Mikuni jetting

If it's the Sreamin' Eagle Mikuni, it should come jetted close enough to take your bike to someone with an exhaust gas analyzer. That's the best way to get your card jetted correctly with the extensive amount of changes that you have made on this bike. I would advise that you take the bike to someone that has a dynometer that is equipped with an EGA and have the run the bike up. I would not want the mixture to exceed 14:1 at any time and preferrably run about 13.5:1. It's a bit on the rich side but it will help keep your engine running cooler. I've installed the carbs before but I cannot remember what jets they had in them. Sorry. Good Luck.

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I had to replace the baffels in my stage 1 swept exhaust. There is a little poping between shifting and down shifting, how can I stop this? The baffels I installed were made by Big City Thunder QQ1994....

Your probably running too rich. The fuel not being burned in the motor sometimes burns up in the exhaust.

I had the same problem with my 03 Vegas when I knocked out the baffels on my Stage 1 kit. I took it to the dealership and they increased the airflow into the intake.

It still runs a little rich, but better too rich that too lean. Mine still pops a little bit, I guess its just the nature of the beast.

If increasing the airflow doesn't do the trick, your going to have to get some more back pressure inside that exhaust, i.e. different baffels that are more restrictive.

Good Luck. Let me know how it goes for ya.

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Put in Big City thunder baffles,but bike don't start up as quick

You might. Changing the exhaust could cause the engine to go lean or rich. Check your spark plugs. Black is rich, bone white with an EXTREMELY light gray (or clean) ring where the threads end is too lean.

Apr 28, 2009 | 2002 Harley Davidson FLHRCI Road King...

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Just installed vance and hines big shots on my 2008 dyna super glide custom. Soon to put aftermarket air breather. Dont know whether to spend the $ on a power commander, V & H fuel pac, or just do the...

all three will give you amazing results i have the power commander and it set my maps perfect with long shots an screaming eagle air cleaner on 2003 heritige softail noticeable difference in sound -idling= start up - drivability -and performance even better gas mileage

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