backfiring is a sign of your quad being lean. sputtering is a sign of being rich. which one is your quad doing?Originally posted by YFZCentral@Dec 14 2003, 07:05 PM
Mods done to bike:
HMF full pipe
CFM airbox with UNI airfilter
Im running JD blue needle #3 180m 45p 2.5 turns mixture screw and im at sea level.....any ideas? thx! 8)
Exactly right.Originally posted by schwendi@Dec 15 2003, 08:12 PM
i copied this from one of my posts at z400central about the fcr40 ... it still applies to the FCR39 though
remember that with the FCR you are controlling the slide with the thottle cable and when you whip it from idle to WOT it will bog. Call James Dean or look for his posts around the net and he will say whatever you do it is not possible to eliminate the bog on a pumper carb.
you can snap the throttle open on the stock CV carb because the slide is actuated by vaccum and wont cause that bog. but it also revs alot slower and doesnt have the same performance of the FCR.
hold it a touch above idle and then pin it WOT and it will be perfect. the bog will never effect while riding or even at launch, just in your driveway