Pilot air screw adjustment question - Pensacola Fishing Forum

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Old 05-07-2015, 08:23 PM   #1
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Default Pilot air screw adjustment question

1999 200hp SWS II two stroke pilot air screw adjustment recommendation is 3/8 - 7/8 Starboard and 7/8 - 1 3/8 Port. Whats the best way to find an optimal setting? This model doesn't have the carbs that use a manometer to read pressure. Any residential experts care to share their process on syncing the carbs, thanks.
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Old 05-07-2015, 10:14 PM   #2
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i can adjust it for you, in front of you and teach you at the same time. just give me a call....
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Last edited by The Maintenance Shoppe; 05-07-2015 at 10:35 PM.
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Old 05-08-2015, 01:57 PM   #3
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Default Here's what works for me . . .

Here's what I found to work on my 95 175 after a fresh rebuild of the carbs and a couple of less successful attempts on dry land with muffs on. It seems that it works best to adjust them in the water under load - at least for me. ymmv

1. Do the link-sync procedure for the carburetor linkage first.
2. Set the idle mixture (air-bleed) screws to the middle of the spec'd range. Be careful to seat the screws gently!
3. Adjust the idle speed to spec (on muffs or in water).
3. Take someone with you, put the boat in the water and run it 'til warm.
4. Find some calm water where you're friend can idle in fwd for a good ways.
5. While idling in fwd, check the idle speed and adjust if necessary.
6. While continuing to idle/fwd, adjust all 6 screws by 1/4 turn in the same direction (cw or ccw) and observe the idle speed and listen to the motor. If idle speed drops or the motor is not as smooth/strong sounding, this is the wrong way - turn them all back to where you started and try adjusting the other way by 1/4 turn.
7. One of the three settings in step 6 above should be better than the other two (original, cw by 1/4 turn or ccw by 1/4 turn). Adjust to this setting. If you want, you can try to adjust cw or ccw by 1/8 turn from here, but you're probably close enough.
8. Try shifting in and out of gear. Turn the motor off and restart. It should start instantly and should not change much in rpm's going in and out of gear. If this is not the case, you likely have other issues.
9. Enjoy!
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