Author Topic: 281 Husqvarna, carb problems?  (Read 1075 times)

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Offline Eccentric

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Re: 281 Husqvarna, carb problems?
« Reply #10 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.

 

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