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o.s. 120

Old 09-09-2007, 10:22 PM
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Default o.s. 120

Can anyone tell how many turns, starting from the close prosition for the low end an a good starting point on the top end ?
Old 09-10-2007, 08:20 AM
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Default RE: o.s. 120

low end try 2 turns out , high end needle go 2 and a half turns out. should be a good starting point
Old 09-10-2007, 10:56 AM
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Default RE: o.s. 120

Thanks Lannybob
I`ll gave it a try this weekend.
Old 09-11-2007, 01:10 PM
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Default RE: o.s. 120

The best way I know how to set the low end is as follows.

Open the high end up about 2 1/2 turns.

Put a piece of fuel line about 1 foot long on the fuel nipple of the carb.
Put a straight pin in the carb opening and close the barrel on it which will leave a small opening.
Blow fairly hard on the other end of the fuel line with your ear close to the carb. If you hear a slight hissing noise, close the low end untill it disapears and then open it back up untill the hiss just begins.

If you hear nothing initially, open the low end untill the hiss just starts.

Be sure the carb barrel doesn't open up while your turning the screw in and out.

Remove pin.

This will get you extremley close to the desired setting on almost all carbs.

Make all of your adjustments on the low end in small increments.
Be sure to run the engine up between adjustments to clear the fuel charge in the crankcase (2 cycle only).

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