Author Topic: Husq 254 questions  (Read 380 times)

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Offline laferret

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Husq 254 questions
« on: November 16, 2016, 02:14:46 pm »
Hi all,

This is my first post so be gentle  ;D

I've owned a used 254 for the last 3 years and to be honest its been a bit of a let down. After about 20 mins work (firewood prep) it begins to bog down and eventually no amount of throttle feathering will keep it running. Once dead it won't start again until cold.
My worst fear is that the crank case bearings have wear but looking at it and checking for play there doesn't appear to be any.
It's had a new air and fuel filter but to no avail. I have supplied a new (non OE) pot and piston to my hobby mechanic father but i'd also like to supply him with a carb service kit.
I am struggling to find a suitable kit because the information he gave me from the carb is not recognised. I wondered if anyone could help?
SN from the saw : 254 9380977
Carb PN: Walbro 21-2457-4

I read somewhere that a certain carb (140?) could replace mine but having searched ebay they are about 90 delivered from the states.
I'd really like to get the saw running properly either to keep or sell but at the moment its totally unreliable.
Thanks in advance

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Offline farmboy

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Re: Husq 254 questions
« Reply #1 on: November 16, 2016, 09:38:16 pm »
The numbers he gave you for the carb are wrong.  It's the casting numbers of the cover.  Should be a Walbro HDA 35 IIRC.
Shep

Offline SawTroll

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Re: Husq 254 questions
« Reply #2 on: November 17, 2016, 06:04:30 am »
Yes, it should be a HDA-35 - and the saw was made 1989 week 38.

It may be a good idea to check the fuel lines and the tank vent as well, to rule the really simple things out.
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Offline laferret

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Re: Husq 254 questions
« Reply #3 on: November 17, 2016, 06:15:15 am »
Thanks chaps. I guess that makes sense. If air is being pulled in to the line after a period of use. If it's simple enough I'll get him to replace the hoses.

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Offline SawTroll

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Re: Husq 254 questions
« Reply #4 on: November 17, 2016, 04:45:13 pm »
If opening (and closing) the fuel cap helps (temporarily) when the saw starts bogging, the tank vent is involved.

Offline wild262

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Re: Husq 254 questions
« Reply #5 on: November 17, 2016, 06:03:03 pm »
Coil might be going dead too after it warms up.  Check for fire after it does this.  If its got fire, open the gas cap very slowly while listening for a suction sound.  If it has one, than this is the problem as Sawtroll said, which is the tank vent.

Offline SawTroll

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Re: Husq 254 questions
« Reply #6 on: November 18, 2016, 01:54:42 pm »
Coil might be going dead too after it warms up.  Check for fire after it does this.  If its got fire, open the gas cap very slowly while listening for a suction sound.  If it has one, than this is the problem as Sawtroll said, which is the tank vent.
A coil that is acting up when warm is of course a possible reason - but I would want to rule out the more simple (and cheaper) ones before going there.

Offline wild262

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Re: Husq 254 questions
« Reply #7 on: November 18, 2016, 06:42:35 pm »
Coil might be going dead too after it warms up.  Check for fire after it does this.  If its got fire, open the gas cap very slowly while listening for a suction sound.  If it has one, than this is the problem as Sawtroll said, which is the tank vent.
A coil that is acting up when warm is of course a possible reason - but I would want to rule out the more simple (and cheaper) ones before going there.
I gave him the benefit of the doubt he would check the cheapest first.  But its not going to cost him 1-penney to check his fire after it quits.  If there is fire, than that rules out the coil!  A 2-minute check, that's all.

Offline SawTroll

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Re: Husq 254 questions
« Reply #8 on: November 18, 2016, 09:20:47 pm »
It usually is best to start with eliminating what is easiest and/or cheapest to fix, before going to the more "advanced" issues.

Offline Eccentric

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Re: Husq 254 questions
« Reply #9 on: November 19, 2016, 04:59:22 am »
Crank seals are leaking when it gets hot, causing it to lean out and bog.  Hopefully the piston and cylinder aren't damaged yet.  Leaning out under load like that can and will cause damage...
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

 

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