'03 954rr with ART Pro Series II slipon, no power commander yet.

Stock air filter or K&N? Will the K&N make it run more lean or more rich? Is it better or worse to use the K&N over a stock filter?

 

don't do K&N without a PC you will lose horsepower... 99% of bikes are like this

 

use stock airfilter-k&n will filter out debri better,but you need max airflo
into the engine-if i had my choice i would remove the airfilter and leave the airbox open!!
but-the engine valves dont do very well with a grasshopper(or what is left!)jammed
up in the valve seats-they are just air filtering devices-k&n does this better,but restricts
airflow-with a pc111 or tricking engine temp sensor you can always get the fuel
into the engine-the problem is getting air-look at super/turbo charging they put more
air into the system,then when the fuel mixture is correct to the added airflow-see ya!!!
thats one of the many ways you can get more horsepower-my point is that air going
into the engine is more import then fuel-as fuel delivery is a easier problem to solve!!
hope that helped you
o8

 

Ok, I put a new stock filter in and will keep the K&N in case I go to a full system and a Power Commander.

While I was at it, I took the new slipon off and was inspecting it. From what I can see, the bike is running pretty rich. There is this cone-shaped piece on the end of the mid-pipe where the bolt-on can slides over it, and that thing was very sooty, a nice thick layer. So then I looked inside the new baffle, and there is a decent amount of soot in there as well.

I am wondering why the bike would be so rich? It is not burning any oil, but perhaps the soot was from the ride home and before I put the K&N in it?

I am going to have the local Honda dealer install new plugs, as I am not sure when or if they were ever replaced and the bike is at almost 11,000 miles.

Is there anything I can look at, or should I just get the plugs replaced and then throw in a PCIII and have it tested and tuned?