easy idle question (for some one!)
Posted May 30, 2013 - 11:46 AM
i have now got my wr400f running great, the only problem is hanging idle!!! all the jetting and fuel screw settings are standard. is there any possibility that it could be electrical?
when the idle hangs high, i can blip the kill switch and it will bring the revs back down to normal ? hence the question about electrical !!
any help would be greatly received
Posted May 30, 2013 - 12:28 PM
It can be caused by several things.
The most COMMON thing is mis-adjusting your fuel screw.
Start with the fuel screw at 1 turn out.
Start the motor, and drop the idle with the idle screw as low as it will go.
Now adjust the fuel screw for max idle.
If it goes to high, drop it with the idle screw, and repeat.
Posted May 31, 2013 - 06:46 AM
Any sort of air leak in the intake (including via the hot start system)
Tight intake valves
Internal leak within the carb body (very difficult to isolate except by ruling out everything else
Incorrect pilot screw adjustment or partially clogged pilot
Ignition timing problems (extremely rare)
Posted May 31, 2013 - 11:33 PM
Also, these carbs can be hard to set the idle speed...
Turn your fuel screw to 2 ~ 2 1/3 turns out (whatever is best).
Then adjust the idle speed from the black knob. This should be slightly high. There is not much between idling high or too low. Find the setting that works in conjuction with the fuel screw setting.
Posted May 31, 2013 - 11:35 PM
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