Husqvarna 545 dies when tilted either side or forward, but ONLY when hot

[1d10t]

Hello

This has me stumped, I have a husqvarna 545 that starts and runs great (starts 1 pull everytime after warm).

However, after getting hot (like after cutting down and trimming a pine tree, basically running hard for at least 5 minutes)

it will start to instantly die when tilted forward or sometimes even when tilted to either side. It happens instantly when tilted

and it still restarts 1 pull instantly afterwards. It happens with fuel and oil tanks full, so it's not the fuel pickup line (and the line 

is not pinched in the tank, I checked). I tried spraying at various points with a brake cleaner after warming it up at home (but it wasn't hot), 

at the gasket, side transfer ports, intake boot and even in oil tank, there was no hesitation. 

Any ideas on what could be the cause? 

[Mick Dempsey]

Crankcase seals at a guess.

[Stubby]

Crank seals . Edit . Mick was in there like a ferret !

Edited November 16, 2024 by Stubby

[1d10t]

Would it be instant with bad seals? When it's hot and I tilt it, it's literally like I hit the off switch, the saw just dies in less than half a second. Must be a pretty bad leak then.

[Mick Dempsey]

There’s a few experienced saw mechanics on here, I’m sure they’ll come in soon enough.

[adw]

Are we talking mark 1 or mark 2?

[1d10t]

Mark 1, about 10 yrs old, 10 and a half I think.

[Mark_Skyland]

I would try running the machine at tick over on the ground then moving/twisting the handle, engine housing, shaft, throttle handle etc looking for a wire shorting out somewhere.

 

[County 764]

Perhaps worth checking the sparkplug cable. Had a similar issue and that was the cause.

[pleasant]

Grab some spray carb cleaner, start it, tip it on its side to the point when it starts to die and with the narrow plastic straw fitted to the nozzle on the can, quickly give it a little spray in one of the cooling holes in the starter housing....towards the front, as far away from the carb intake as you can.....if the revs momentarily increase then its the crank seal failed. Quick and easy way to check