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Chainsaw won't start


K Mac
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Hi folks I could do with some advice and help please 

I've got a Husqvarna chainsaw and it won't start it was playing up so.

I put a new spark plug ,carburettor,fuel filter, fresh fuel and the air filter is clean.

And the spark plug is sparking so all the usual stuff checked off.

When trying to start after a few pulls I get what seems to be the ignition of the fuel gases that have built up in the exhaust and a puff of smoke.

Not Anything like it trying to fire up then nothing till this happens again.

I'm stuck anyone knows what the problem is?

 Thanks 

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Newish fuel line but will replace.

no priming bulb so not that.

the exhaust has been checked and cleaned.

no spark arrest or on this one not that.

bran new carburettor comes set to run and tried that with old one.

new fuel running the same batch in other saw no problem.

I can't fathom this one at all

thanks so far

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Have you pulled the spark plug and tried pulling the starter to make sure your getting g fuel air mix to the chamber. It should come out the spark plug hole like a fog.

Check the spark plug is sparking against the engine. After that and as others have said exhausts clear I'm stumped.

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Take the plug out.

Squirt some fuel down the hole.

Screw the plug in.

Pull it over.

Does it fire and run after that?

If not there's a chance that the diaphragm in the carb need replacing.

Over time the diaphragms stretch and weaken due to petrol.

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I had a problem with one i had , the guy who sorted it said i had flooded it he stripped it , and said never pull it on full choke more than 4 times . He said it kicks , but you can not always here it. I did as he said 4 pulls choke half in and it would fire every time . 

I got a sthil after that .

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It's a 365 special made 2002

just pulled the spark plug out pulled it a few times no fog coming out just a slight smell of fuel 

will look at it tomorrow as wouldn't be popular running a saw at this time of night 

thanks folks

keep the advanced coming 

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First things first, is there good compression? Quick field test is to place saw on floor and try to lift it by the pull start. Saw should lift from floor without pull cord coming out. If the saw starts to "bump" down the cord too fast remove spark plug and pull off the exhaust have a look in the port, and slowly pull the cord looking at the piston as it travels past the opening. If there is heavy scoring or blending of aluminium over the rings then it's time for a rebuild. Whilst the exhaust is off check to see that any spark arrestor fitted is not clogged. Next refit plug and spray a little fairy liquid around the decompression button and pull it over, any bubbles appearing mean a leak. After that assuming you have good compression try and start the saw, after ten or so pulls whip the plug out and have a look at it, is it wet or dry. If it's dry check the impulse line from the crankcase to carb for splits, any leak here will stop your carb from priming and therefore stop your fuel supply. As already mentioned a small squirt of fuel/brake cleaner down the carb throat and then pull it over will prove its a fueling issue. Also check your tank vent isn't clogged. If the plugs wet then check your carb settings, in to face and out 3/4 of a turn should get it fire and run with a bit of throttling. If not then you've deeper issues. Try it and let us know.

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