Air Screw

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tony_d123
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Air Screw

Post by tony_d123 »

I bought a KDX220 a couple of months ago and it has always seemed to stutter and miss at low revs, which made riding it a pain. Also seemed to take a long time to clear itself when cold, as though it was running rich.

Was going to strip the carb to check the main and pilot jet sizes, but decided to check the air screw first and it was 1 turn out (should be 1.5), so gave it another half a turn. What a difference, suddenly it runs clean, revs easily and feels crisp and lively!

From thinking I might have to sell it and go back to a 4-stroke, it is now a joy to ride, I couldn't believe what a difference half a turn on the air screw can make, no other bike I have owned has been that sensitive to air screw adjustment.
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Indawoods
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Post by Indawoods »

2 strokes are very sensitive to air adjustments. I tweak mine on every ride since tempature plays a huge role.
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AwfulSmokey
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Re: Air Screw

Post by AwfulSmokey »

>|<>QBB<
tony_d123 wrote:I bought a KDX220 a couple of months ago and it has always seemed to stutter and miss at low revs, which made riding it a pain. Also seemed to take a long time to clear itself when cold, as though it was running rich.

Was going to strip the carb to check the main and pilot jet sizes, but decided to check the air screw first and it was 1 turn out (should be 1.5), so gave it another half a turn. What a difference, suddenly it runs clean, revs easily and feels crisp and lively!

From thinking I might have to sell it and go back to a 4-stroke, it is now a joy to ride, I couldn't believe what a difference half a turn on the air screw can make, no other bike I have owned has been that sensitive to air screw adjustment.
Try going out 1 more turn and see what happens. If it gets better go out even further. Then you know you are too rich.
1989 KDX 200
1999 KX 250
tony_d123
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Re: Air Screw

Post by tony_d123 »

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AwfulSmokey wrote:Try going out 1 more turn and see what happens. If it gets better go out even further. Then you know you are too rich.
I will have a play next weekend, will also take the carb off and check the jet sizes that are fitted and needle position.
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