Husky 445 won't run

[jamallio96]

I have a slightly mystifying problem - my 445 will start but not run. To elaborate, no matter what starting method I try, be it choke on, high idle, no choke, holding throttle etc, the saw will audibly fire after a couple of pulls like normal then die instantly. I can see exhaust coming out of the muffler and the plug definitely gives a spark, I don't think it would be fuel line or carb related as the saw still fires perfectly normally, but only when I'm pulling the cord!

The issue began on friday when I picked it up (after it having worked fine just minutes before) and it just refused to run!

Anybody got any ideas before I start needlessly replacing random parts?

[Wedgebanger]

Impulse ?  Or carb ...

[Stubby]

It could be carb related in as much as the High speed circuit could be blocked . There is a little gauze filter under a screw this could be crudded up .

[spudulike]

As Stubby said, sounds like the saw is getting enough fuel to fire but not enough to run. Common culprits, fuel line split, fuel filter blocked, gauze strainer blocked, pump diaphragm split, metering arm not set well, hard diaphragm etc

It is also possible that the piston has nipped up and dropped the compression off but less likely.

[adw]

Ignition unit would be my guess, changed plenty.

[spudulike]

8 minutes ago, adw said:

Ignition unit would be my guess, changed plenty.

Mmmm, interesting, had this on a Stihl blower once, would idle perfectly but as soon as the revs increased, that was it. Must have been the ramp up circuit on the ignition advance kicking in and killing the spark as if you feathered it, it would run low revs but sounded really lumpy and rough.

Try to get hold of an original coil if it is this as the aftermarket ones can be pretty bad.

You can do the old...bend the end electrode out and see if it will jump a big gap, the blower one did jump a big gap but yours is different, have had coils produce a couple of sparks and then nothing so a possible cause.

 

[adw]

Be aware there are more than one unit, you need to remove the flywheel, on the inside will be its part no, go to the parts list that shows that flywheel and select the ignition unit from that list.

[spudulike]

Good luck with that