Thursday, January 19, 2012

08 Harley Sportster Back fireing on decel after adding power commander?

I just bought a 08 Sporster, I put vance %26amp; hines slip on's, SE air filter and power commander. I uploaded the map from power commander for my set up. But its not right. Its running to rich. Its popping on decel....and on cold starts...it cuts out when I try to rev.....and black smoke for about the first min. After about a min. I can rev...no smoke, only decel popping.

Tech support from power commander was not very help full. They said I could ajust to make it less rich or more lean. But I don't know how so....The only thing I know to do is get it on a dyno "OUCH" Anybody know anything I can do besides Dyno?

Thanks, any help would be greatful08 Harley Sportster Back fireing on decel after adding power commander?
The mans right, take that junk off and sell it.

Ride the bike like it came from the factory.



If you want to go fast get a Honda.



Sportsters aren't fast and never will be.
since you have already installed pipes as well as the air cleaner witha power commander the best thing to do is take it in and have it re-mapped on the dyno it scuks but that would fix the problems your having I was told by the Harley shop that as long as all I do is change the pipes I wouldn't have to do a dyno tune-up but if I install the screaming eagle air cleaner it with the aftermarket exshaust pipes i would need to have it tuned up on the dyno08 Harley Sportster Back fireing on decel after adding power commander?
I have owned bikes with fuel injection(Harleys)and power commanders. I know when u first start one they will run rich for awhile because the choke is working. Mine always threw black smoke for a little while after starting. Dynos will get it done right.
a little black smoke when reving on a cold start up is not necessarily bad. the popping on deceleration COULD be nothing more than a small air leak in your exhaust

but it sounds like you've already voided your warranty so you better let them remap it on the dyno to make sure you dont do any damage. better to pay for an hour on the dyno now than to pay for an upper end job later.08 Harley Sportster Back fireing on decel after adding power commander?
First, congrats on the new bike. Dont listen to those other wannabees...they all have a deep down desire.



Dynos are expensive...but well worth...you will notice a big difference.



Sounds like it is running to rich...might need to just turn down the oil intake...or gas input...
if you wanna go fast go get a Japanese bike.
the first thing you need to do is make sure there are no exhaust leaks, (with the motor running, take a lighter and move the flame around the exhaust port and the O2 sensors, if the flame flickers then you have a leak and you need to fix it) You did reconnect the O2 sensors back didn't you?



If every thing is right then lean it out a little (very little) take the bike for a ride then check the plugs (light tan color is what your shooting for).



Decel popping is common for V%26amp;H pipes. Richen up the decel portion on your power commander if it offers it.



You can tune this out with Race tuner but I'm not sure about power commander (one of the reasons why we don't recommend them to our customers)

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