FMF PowerBomb SX header and jetting?
Posted January 05, 2004 - 02:57 PM
Posted January 07, 2004 - 09:45 AM
Posted January 07, 2004 - 08:12 PM
I did a lot of power-up work on an XR650L... cam & pipes... and I had to go off-the-charts 'up' on the main jet.
Others here have tons more knowledge about this bike than I do so far, but unless they have other ideas... try a 200 main or slightly higher. The rev limiter wouldn't be in a different range than before.
Didn't FMF promise a jet kit to be included with that pipe?
Posted January 08, 2004 - 10:15 AM
Posted January 08, 2004 - 05:34 PM
Tried the mainjet. Went from the 180 to 190 and then 195 and up to 3 screws out on fuel screw. Sounds and pulls better low, but still an odd hiccuping or hesitation under acceleration from about 1/2 to full throttle, especially noticable at full throttle. No real popping or backfiring. The gas is about 75 days old. Think that could be it???
Posted January 08, 2004 - 07:43 PM
I'm by no means a jetting expert but you may be to rich on the main causing the hesitation.
I just got the mx power bomb and went up 1 on the main. and 1/2 a turn on the fuel screw.
Try posting in the jetting forum and JD will lead you in the right direction
Posted January 09, 2004 - 07:23 AM
That 180 main seems very rich to me, header or no header.
Posted January 10, 2004 - 03:03 PM
Change to YZ timing and try the jetting in my signature. Or order the JD kit. Someone correct me if I'm wrong but, the JD kit will provide a speadsheet for making changes at every throttle setting ie if you chage the main you should try ___ pilot at ___ needle.
Posted January 12, 2004 - 01:14 PM