Author Topic: 281 Husqvarna, carb problems?  (Read 393 times)

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Offline KilliansRedLeo

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Re: 281 Husqvarna, carb problems?
« Reply #10 on: January 14, 2014, 10:12:50 am »
I blew up the picture, I was wrong your have it in place correctly!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline Eliott

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Re: 281 Husqvarna, carb problems?
« Reply #11 on: January 14, 2014, 11:38:02 am »
Yes the blow up helps. I do it quick, press ctrl and + at same time and click a few times, will bring them in, use the minus sign with ctrl to zoom out.

more carb pics this morning. looks pretty clean, 'eh. ;)

Offline sharkey

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Re: 281 Husqvarna, carb problems?
« Reply #12 on: January 14, 2014, 04:00:24 pm »
Go over to Tillotsons website and look up your carb.  Study the pics.  Make sure you put the diaphragms and gaskets in the correct order.  On the metering side the gasket goes against the carb body with the diaphragm over it followed by the cover.  On the pump side its the opposite with the diaphragm against the carb body and the gasket over it followed by the cover. 

Did you check your fuel line for cracks?  Where the line goes through the tank is a place to check. 

Open each jet 1 and 1/2 turns from lightly seated as a starting point. 


Offline Eliott

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Re: 281 Husqvarna, carb problems?
« Reply #13 on: January 14, 2014, 06:21:44 pm »
All gaskets in correct order. Fuel line is new, as is the tank grommet. Jets set correctly as saw was started, tried and run at various times. .

Worked better today after reassembly, but I'm afraid there is air leaks. So into the seals now ... .

Offline Eliott

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Re: 281 Husqvarna, carb problems?
« Reply #14 on: January 14, 2014, 06:49:08 pm »
For those good folk that would like to hear and see the old beast chatter and suck, go here,
http://youtu.be/J_U5oxC18d8  .

You can see the choke plate being manipulated, kept slightly open in order to keep it running... eventually it opens up too much and kills the saw. 

Offline KilliansRedLeo

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Re: 281 Husqvarna, carb problems?
« Reply #15 on: January 14, 2014, 06:58:42 pm »
OK, new seals it is, the flywheel side is HVA part number 503 26 02-05, the clutch side 'O' ring is HVA part number 740 42 24-00 and the clutch side seal is HVA part number 503 26 02-05 total price around $26 plus ship. You should replace the 'O' ring as it keeps crap off the seal!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline dutchsawdoctor

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Re: 281 Husqvarna, carb problems?
« Reply #16 on: January 14, 2014, 07:38:10 pm »
Strange to need new seals as it whas running better befor the carb. rebuilt ??? Sounds more like a bloked off puls line do( i could be wrong ) ::)
Best regards,Saul
Dolmar  Stihl Solo Husqvarna Homelite Ole-mac Echo Jobu Ridgid Poulan Remington Pioneer Partner ,Danarm stanley
more chainsaw repairs Oldtimer-Motorsägen  http://pily.strojevlese.cz / http://www.sauls-kettingzagen-site.nl

Offline KilliansRedLeo

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Re: 281 Husqvarna, carb problems?
« Reply #17 on: January 14, 2014, 07:52:00 pm »
Good thought Saul! The 181 did use an internal pulse through the manifold. Could be a misplaced or mis aligned gasket. Or the face of the manifold could be clogged! Looks like he should take it apart again! May even be that the passage through the cylinder is partially blocked. We all know how much goo gets clustered around the intake tract on an older saw! However that would require removing the cylinder to clean out the cylinder port.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline Eccentric

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Re: 281 Husqvarna, carb problems?
« Reply #18 on: January 14, 2014, 08:32:33 pm »
That o-ring on the oil pump housing is critical because the seal is in the pump housing, and the pump is exposed to crankcase pressure/vacuum.  Should replace that o-ring any time you remove the oil pump.  Crank seals on both sides are the same on the 281 and 288 (and later 181SE's).  Early 181SE's had a different flywheel side seal. 

I also am thinking it's an impulse signal issue here, since it ran fine before all this.  Could be some crap in the impulse channel, or maybe a bum (or misaligned) gasket (on one or both sides of the manifold).  The manifold could also have developed a crack that was 'opened' enough to leak during the dissassembly/reassembly process. 

Also, that carb does have a metering lever with forks on both ends..................and therefore you must slip that fork into the groove on the 'tit' on the metal plate on the metering diaphragm for things to work right.  When that isn't done, the saw usually stumbles and floods however.  The diapragm also goes onto the carb body after the gasket on the metering side........................while the diaphragm goes on before the gasket on the pump side.

Offline KilliansRedLeo

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Re: 281 Husqvarna, carb problems?
« Reply #19 on: January 14, 2014, 08:56:48 pm »
+ 1 on that Eccentric!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

 

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