View Full Version : # of discs for "03" ultra?

01-15-2008, 08:35 PM
Running a "03" ultra with stage 1 big bore and power commander. Stock cams, stock pipe headers and 3" internal disc slip-ons.

Currently running 16 in the right and 20 in the left - thinking that the left needs to be more open to do anything. Bike pulls OK but I wonder if it flows enough. Any recommendations?? Plugs look OK - maybe a bit dark - but the PC makes remapping for fuel very easy.


01-16-2008, 07:50 AM
Dark plugs may indicate a rich condition. Try swapping discs out to the right side where most of the exhaust flow is...20 on right & 16 on left.