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#Post#: 636--------------------------------------------------
Carb ?
By: Old Iron Logging Date: March 6, 2011, 7:34 pm
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Carb is a Walbro HDA 205-C. Set to factory spec the saw turns
12,700. Manual says to set saw to 13,500 post break-in. Trouble
is, as you make the carb setting leaner, the saw looses rpm.
With the H closed off saw holds 12,000 rpm. Acts like a fuel
governed carb, but see no governor on it. Tech at ESF saws the
carb is not governed. Any ideas?
#Post#: 652--------------------------------------------------
Re: Carb ?
By: stihlbro Date: March 7, 2011, 10:57 am
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Do you have another carburetor to bolt on to eliminate the one
on it now? To me if you close off the hs needle it should stop
fuel supply, so it shouldn't turn 12,000 rpm. Sounds like the
main jet is getting fuel from somewhere else because I dont see
the low speed jet suppling enough fuel to turn that rpm. The
last hda i remember had a brass plug over top of the main jet, I
wonder if this is leaking? Fuel is getting to the engine somehow
to run wide open throttle.
#Post#: 655--------------------------------------------------
Re: Carb ?
By: Old Iron Logging Date: March 7, 2011, 11:28 am
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I tried it with another used carb and got the same result. That
had me thinking governor. But unless they are built different
now I can see no evidence of one. Going to try a new carb today.
#Post#: 657--------------------------------------------------
Re: Carb ?
By: Cut4fun Date: March 7, 2011, 11:34 am
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Could be gov inside car. Had 084 carbs that had some kind of
limiter in them. Brass jet type thing inside the carb itself,
that flooded them out like the outside brass gov we normally see
on carbs. JB was used to block orifice ;) has to be something
better to use out there.
#Post#: 658--------------------------------------------------
Re: Carb ?
By: Old Iron Logging Date: March 7, 2011, 11:49 am
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From this ill it appears to me that there is a governor under
the idle adjustment screw. Am I reading this correctly? Look at
part #s 17 and 33
HTML http://wem.walbro.com/walbro/product.asp?CategoryName=944&Series=HDA&partnum=HDA-205-1&GroupName=Chain%20Saw&FamilyName=EMAK
#Post#: 659--------------------------------------------------
Re: Carb ?
By: stihlbro Date: March 7, 2011, 12:09 pm
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I've been looking at that too, it appears the hda series has the
option of a governor.
#Post#: 660--------------------------------------------------
Re: Carb ?
By: Old Iron Logging Date: March 7, 2011, 12:12 pm
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I just looked the carb over again and see nothing on the
outside.
#Post#: 661--------------------------------------------------
Re: Carb ?
By: Chainsawrepair Date: March 7, 2011, 12:12 pm
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17=
#Post#: 677--------------------------------------------------
Re: Carb ?
By: stihlbro Date: March 7, 2011, 3:25 pm
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I also see the circuit plate as a possibility. Fuel has to be
feeding the engine to see 12000 rpm. Kinds sounds like a
governor to prevent leaning out on topend. I don't see the low
side delievering that much fuel. Does the 205c have the circuit
plate?
#Post#: 744--------------------------------------------------
Re: Carb ?
By: Old Iron Logging Date: March 8, 2011, 1:36 pm
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Yes the 205 has a circuit plate.
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