Sthil magnum 308

[Geoff Cooper]

Hi wonder if I can get help
I have problems after starting the chainsaw. No problems starting it .
Trying to start the chainsaw again it after maybe 5 minutes of use it kicks back and will not start. I have changed the coil and it still happens.
Any help would be greatly appreciated
Kind regards

 

[JJoe_257]

My first guess would be a vacuum leak.
Check the carburetor boot and impulse line for any cracks.
Even a tiny crack can cause a leak once the saw gets hot and the plastic or rubber expands..
Also make sure the spark plug is snug since a loose plug can cause it to run poorly or die out when hot.
It might also be worth checking if the fuel cap vent is clogged.
That would create a vacuum and starve the engine of fuel after a few minutes of running.

 

[Geoff Cooper]

My first guess would be a vacuum leak.
Check the carburetor boot and impulse line for any cracks.
Even a tiny crack can cause a leak once the saw gets hot and the plastic or rubber expands..
Also make sure the spark plug is snug since a loose plug can cause it to run poorly or die out when hot.
It might also be worth checking if the fuel cap vent is clogged.
That would create a vacuum and starve the engine of fuel after a few minutes of running.

Thanks for your help.
Found the fuel filter was blocked and the supply hose was faulty.
All good now
Kind regards Geoff

 

[Astro Lad]

Kickback after warm starts usually isn't ignition, it's compression and timing. Some saws are built with flawed coil timing curves, and swapping coils won't cure it, and only reworking timing truly solves it