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Old 12-20-2011, 07:42 PM
racer1970 racer1970 is offline
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Join Date: Dec 2011
Location: Apopka Fl
Posts: 6
Carb. tuning on Echo HC-150

Would anyone know what the factory setting is for the one hi-mixture adj. screw is in number of turns out is? As when I got this HC150 it was running vary rich, black plug, oil dripping out of the muffler etc. I turned the Hi speed adj screw in a few turns and runs accelerates much better and can idle forever if I let it.... but with non-eth 93octane fuel and Amsoil Saber mixed to 80:1 it really screams at wide open throttle but still smokes? so I would like to know if possible the factory setting of the Hi speed screw located by the primmer bulb. As i would like to tune this right and correct.

Thank you in advance for your help and input
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Old 12-20-2011, 08:49 PM
djagusch djagusch is online now
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Location: MN
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Just a thought. Have you cleaned the exhaust port (and muffler) out and put in a new plug? The oil from being rich takes awhile to burn off before it quits smoking.

I don't know the standard turn out. I always go by how it sounds/runs. After that check the plug after running it and see what it looks like.
Looking for blown Kawi 29HP DFI engine's fd791d, whole thing, intake, throttle body, and electronic's. PM me if you have something you would like to sell.
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Old 12-20-2011, 10:35 PM
GlynnC GlynnC is offline
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Location: Nashville Tennessee
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Factory settings are not always correct--one of the most accepted ways to tune the hi-speed is: 1. run the engine to get to operating temp. 2. With engine running at full throttle, close (clockwise) the hi-speed screw until engine speed starts to slow down, keep count of how much you turn the screw and open it (counter-clockwise) until engine starts slowing down, then set the screw half-way in-between the two points.

For years I tuned by setting to highest rpm position. I think this is now too lean--especially with today's gasoline. Open a little past this point.
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Old 12-21-2011, 11:44 AM
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BigFish BigFish is offline
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Location: chesapeake, va
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GlynnC's advice is pretty much on the money. You don't want to lean it out too much ( max screaming rpm) or ya risk a meltdown! And with clippers ya got all that stuff movin around in there.

The " factory setting " that you are referring to is actually just the starting point to get it running. In your case it does'nt matter since it already runs.
It usually is 1-1/2 to 2 turns out from lightly seated.
It ain't rocket science! far.

'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "
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Old 12-30-2011, 02:22 PM
Big Wes Big Wes is offline
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Location: Virgina Beach,Virginia
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From the closed/seated position, open the H & L jets 1 full turn. Should start from there.
Big Wes Owner/Operator Neighborhood Lawn Care. Since 1990
"Satisfaction Guaranteed or Double Your Clippings Back"
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