O
Generally speaking, when going to a set of twin pipes is an increase or decrease in pilot jets usually required. I have a 99 SKS 700 with PSI center dump twins on it but need to clean up the bottom end. I have went through the Kehins and allready have a boost bottle, power paks, and the 1371 needles. Main jetting seems to give me good wash with 215 PTO and 210 Mag?(I thought I would stagger the other way, but this provides good results) at 3000ft (-15C). Just wanna get some others with past experience on these motors, have to buy pilots either way I go. 38's in right now BTW. Thanks