Author Topic: Messed with carb screws, now it won't start  (Read 746 times)

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Offline fossil

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Re: Messed with carb screws, now it won't start
« on: May 19, 2016, 05:09:38 pm »
The high screw is the most important as a lean adjustment on that screw will cause your piston to melt. Goodbye saw.

I think with that saw you should start around 2 turns out from lightly turned all the way in on both high and low screws.

Te idle speed screw which sets the idling speed can can be turned up a bit (clockwise).

Start the saw.
The idle mixture screw is set correctly if the saw rev's up quickly from idle when you squeeze the trigger. If it bogs down, Turn the screw out (counterclockwise) until it does. If it does rev up from the starting point of two turns, turn it in 1/8 turn at a time until it bogs when you squeeze the trigger. Open it up a bit so it rev's up quickly. That way your idle won't be too rich.

Set the idle speed screw down or up so it doesn't stall but it isn't going so fast that the chain is moving.

To set the high screw. Make sure the saw is warmed up.

Rev the saw to full throttle for a second. If it is screaming, turn the high mixture screw out until the exhaust note sounds like it's missing at full throttle. That is called four stroking. when the saw is reving free (not in a cut) you should just be on the edge of screaming and four stroking but you must be four stroking. Once the saw is under load (cutting wood)  the exhaust note will clean up and the four stroking will go away.

Once the saw is doing those things you are set to go.

Make sure you have fresh fuel mix in the saw. Don't use old fuel mix.

If you are still having trouble, you may have to get into new fuel lines, a filter and possbly a carb kit.
Tim
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