I have a 1997 Kawasaki ZR 400. Previously when I used to ride it I noticed that RPM flattens at 3500 rpm for a few seconds and ramps up again. This bothers me because on uphill dive it loses power at 3500. Ined to reve up beyond 3500 before I climb a hil. After sometime of no using the bike it did not start when atempted to. So what I did was cleaned the carb and repalce 4 orings of the air screw.
After assembling I noiced that it won't start without the choke. And once it started RPM flattens at 4000 RPM for a few seconds and ramps up again. I also noticed that the idling is not stable. From revoluton it would idle at around 2500 and slowly goes down until it dies. Tried adjusting the idl stop screw but same poblem.
Can anyone give me the solution? May I know how much back turns is needed for the air screw?
The air screw and the idle screw turn inward until they LIGHTLY seat, then back out one and one half turns. For the dead spot, pull the slide out of the carb and move the clip on the jet needle down one notch. Two notches if needed.
The pilot jet covers the idle function. It sounds like this is not the problem though. The high idle indicates a lean fuel mix. An air leak is leaning the mix. It could be bad intake manifold gaskets, carb and manifold not down tight, loose spark plug, cylinder head not tight, bad head gasket.
If you do want to adjust the pilot jet the, often it is adjustable from the outside of the carb. It is normally located just out side and next to the main jet. It will be brass and have a slot for a small screw driver. If no outside screw, then an inside adjustment screw means removing the float bowl. Turn the jet screw outward 1/4 to 1/2 turn.
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Thanks for your answer, I'll do that and give you fedback.
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