Stihl Chainsaw Problem: Choking under full throttle

[ha2424]

What could be the problem with this relatively new chainsaw? What should be the first thing that I should try? Or should I just bring it to my local dealer instead?

 

Many thanks in advance for any advice!!

 

 

[peatff]

Clean the carb, check the metering arm setting or take it back. It sounds like it's running out of fuel under load

[lurkalot]

Get it checked out, sounds pretty sick, and not just at full throttle by the sound of it.  How old is the fuel?

 

Don't fiddle with it before taking it to the dealer if you're talking warranty, or they could throw it out.  (The warranty that is).

[ha2424]

Thanks a lot, that really helps!  Also thought that I probably should try a new air filter in case it doesn't get enough air? 

[Dan Maynard]

How new? If under warranty obviously take it back.

I would do fuel filter, plug and air filter first just because they are cheap and easy to rule out. Also, does it do this straight away or only after a bit of work?

[ha2424]

Thanks again!

 

The fuel is fresh, ...less than a week old.

 

Unfortunately the chainsaw is not under warranty anymore. I bought it as a backup saw and only used it 5 or 6 times during the last 4 years. 

 

Initially it was running well, ...until I was going through the base of the trunk. Maybe it just got too hot?

[ha2424]

PS: How old is too old for petrol?

[lurkalot]

49 minutes ago, ha2424 said:

Thanks again!

 

The fuel is fresh, ...less than a week old.

 

Unfortunately the chainsaw is not under warranty anymore. I bought it as a backup saw and only used it 5 or 6 times during the last 4 years. 

 

Initially it was running well, ...until I was going through the base of the trunk. Maybe it just got too hot?

Four years old and hardly any usage is probably one of the worst scenarios to be honest.  You really need to get the saw, or at least the carb serviced.   Metering Diaphragm has probably gone hard.

[bmp01]

Idles surprisingly well doesn't it.... Considering the high speed running I'm a bit surprised it doesn't just throw the towel in and give up.

Probably just a fueling issue but I'd check the piston condition before running it anymore, (exhaust off, visual check through exhaust port). An outside punt,  does chain run freely, chain brake is not clagged up ? Could explain why it idles ok but can't achieve a decent running speed. 

Edit: scratch that, looks like chain is running on at the end.

Edited June 11, 2019 by bmp01

[GardenKit]

I would simply be doing a carb service first. Sounds like its not getting fuel, most likely a blocked gauze inside the carb IMO.