New (to me) wr400f
Posted July 13, 2008 - 03:30 PM
Sorry but I am new to dirt bikes so any help would be great.
Posted July 13, 2008 - 05:58 PM
Posted July 13, 2008 - 06:48 PM
Posted July 14, 2008 - 07:29 AM
Before you pull the carb, turn the idle screw out a little bit (while warmed up and running, get it down to about 1300rpm - usually just above setting it to smooth not choppy - this should be your starting point.
Now, if you have an aftermarket fuel screw (a knob under the bowl - front of carb - goes up inside) you can play with this screw, if you don't, you need to get a small short flathead screwdriver and place it up in the hole in that same location to adjust the factory fuel screw.
Before adjusting it (with bike off) turn this screw in until LIGHTLY seated - counting full turns - write this number down.
The fuel screw adjusts the pilot jet fuel output ever so slightly and only works in the 1.5 to 2.5 turns out from seated positions.
So, having counted revolutions to lightly seated, bring it back to where it was.
Start bike - warm up for 10 minutes.
Now turn fuel screw in until idle drops, from here, turn it out (there will be an area of about 1 revolution where noting really changes) counting turns again until idle changes.
Back the screw in half the number of turns of what it just came out and that will be your proper setting.
Turn your idle screw out to bring it down to a nice smooth idle but not racing.
(You can count revolutions of the fuel screw until lightly seated again (write it down) just to see if it falls within 1.5 to 2.5 turns and if it has changed from your earlier setting.)
Now, if your bike bogs on acceleration, it may be a part of the carb that's dirty, or broken, but we'll get to that then (if needed).
Whatever you do - do not remove the black TPS off the carb when cleaning, just unplug the wire.
Your bike should have good 0-1/4 throttle response at this setting, if not, you may have to go to a different pilot but it will likely be ok.
Posted July 14, 2008 - 06:00 PM
Posted July 14, 2008 - 06:19 PM