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Pilot Mixture Screw Consequences

K

Kentman7

Forum Apprentice
I have a 1982 Suzuki GS300L.

What would be the consequences of a pilot mixture screw being open too much or too little for that matter?

thanks!
 
Rich or lean mixture at idle up to around 2000 rpm..
Above that the discrepancy has a lessening effect and feathers out as the jet needle, needle jet and main jet adds to the fueling curve..
 
Usually between 1-1/4 and 1-3/4 turns out from lightly seated but you should look at the specs for your particular model for the exact recommended settings.
 
There is no clear answer to that. Common wisdom has it that we set the screws to about 2 or 2.5 turns open for starters, then turn them at idle until the highest idle speed is achieved. That will put them very close to optimal.
 
What's worked for me is setting a baseline of 2 turns out on all the screws. Go for a ride so the engine is nice and warm. Drop the idle down to the lowest smooth idle you can achieve. Do a small blip of the the throttle. The revs should pick up very quickly and drop just as quickly. If the revs drop back but go below idle (stumbles) or it stalls, it's rich. If the revs drop slowly back to idle (hangs) it's lean. Make equal adjustments across both screws by ⅛ of a turn, until the throttle response is good. As it is a fuel screw, screw in to make it leaner, screw out to make it richer. Go for a test ride. Adjust idle if necessary.

​​​​​​
 
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