I have a 2001 RK, Big Shot Duals, stock ECU, stage 1 AC. Using a PCIIIr - old school, I know. My question, if I get a bit of a backfire when shifting up, is it too rich or too lean? Not sure if I should increase or decrease The fuel table. And, at what rpm range?*Any suggestions?

 

You have two areas to consider...

RPM, and Throttle Position. Depending on when the pop occurs, either when letting off the throttle, or when raising it. If you were giving it a little gas, notice what position was the grip percentage wise. Try to see where it is in the RPM range when it happens also.

Try using your throttle to tell which is needed...

Hold the throttle slightly open, as you up shift, to see if it pops. Then be sure to roll the throttle completely forward, (less fuel), and see if that is when it pops. Which is worse, more fuel, or less? What RPM range, and what percentage of throttle were you giving it?

I get a little pop now and then on my '99 RK. By holding the throttle slightly open, the pop usually doesn't occur. Mine, when it happens, is when I have released the throttle. Seems to be a little lean when it happens to mine.

 

Yes, it is when I release the throttle. Not sure about the throttle percentage, will have to guess on that.
Too bad they don't have an app for a smart phone, so you can watch it, as you ride.

 

Anyone ever advance the timing in the 10-30 percent throttle positions? Could this help performance?

 

Go to the 0 % column starting at 1000 up to 4500 change the numbers to 10 in all the cells Only in the 0% column and see if it goes away.. might have to increase as far as 20... Decel popping is usually a lean condition.

 

Are you referring to the FUEL TABLE or IGNITION TABLE?
What I'm after is improving acceleration performance a little, it's a boy flat in the power curve.

 

He is talking fuel table. No timing numbers in the 0 column. If the 10 in the 1000 row makes it idle too rich you can omit putting the 10 in the 1000 row.

 

Is it ever appropriate to advance the ignition table?

 

I haven't looked at any stock timing tables for the earlier models so can't say. I know the 08 up stock tables can use more timing. About 4 to 6 degrees in the idle to 2000 rpms 40% throttle position. You can probably add as much as 4 to 6 degrees in the 90 to 100% area above 2000 rpms without problems. If you detect an audible ping, make note of throttle position and rpm and change the timing in this area. Sometimes just richening 3 to 5% will help also. Won't do the mileage any good if it is in cruise area to richen it. If it is truely too lean it probably won't hurt mileage. Play with the maps some they won't bite you. Just save the current and you can always go back to it.