#150 main,.. #52.5 (stock pilot,.. 0.07" spacer... That's what I's try...
Keeping the stock pilot will help with MPG's...
Anyway,.. that's what I'd try...
PSST,.. find yersef a Harley shorty muffler...
![Smiley Smiley](/yabb2.2/Templates/Forum/new/smiley.gif)
...
I'm running a #150,.. #50,... 0.07" spacer on mine,.. at 2600ft+... with Dyna muff, K/N slide-in filter,.. and mild exhaust port matching...63mpg average... good power,.. little popping, no backfires...