550 xp

[Cov Climber]

Hi everyone,

I've got a Husqvarna 550 apart from a new clutch has been fantastic until now.

For some reason when I'm using it, it suddenly loses power like it's being starved of fuel and then it's fine again? Has anyone else had this problem or have any idea what it could be.

 

Thanks in advance

 

Ed

[Stubby]

Hi everyone,

I've got a Husqvarna 550 apart from a new clutch has been fantastic until now.

For some reason when I'm using it, it suddenly loses power like it's being starved of fuel and then it's fine again? Has anyone else had this problem or have any idea what it could be.

 

Thanks in advance

 

Ed

 

Did you set the auto tune as per the book when you first got it ? Have you ran it right out of fuel at all ? If ether of the above you will need to set the atotune

[Cov Climber]

Thanks for your answer. How do i set the auto tune?

[Stubby]

Thanks for your answer. How do i set the auto tune?

 

Its in the book . Goes something like ...Start the saw rev it hard and make 3 to 5 cuts the full length of the bar keeping the saw flat out . just check in your hand book , its in there .

[Stubby]

If that does not cure it you may need to take it to your dealer to have it plugged in for a diagnostic check .

[Cov Climber]

Thanks. Being a the very organised person that I am, I seem to have misplaced the Manuel.

I will have a look on youtube and see what I can find

[54gka]

Run the engine to full throttle and saw a number of cuts in a thick log (3-5 min) the saw must be run (8,000-12,000 rpm) the entire time to allow the carb to adjust itself. The manual states this should be done when first used or when outside circumstances change

[Cov Climber]

I think I will take it to a dealer and get it looked at. Thanks for you help Stubby.

[Cov Climber]

Thanks 54gka

[TGB]

I wondered if "... (3-5 min). " meant cuts or minutes and there's a thread on here somewhere. I also emailed Husky UK, who eventually got back to me. The definitive answer being, calibration time takes 3-5 minutes; and is done when:

First out of the box

Whenever you change altitude by 1,000ft

When a new air filter is fitted

When fuel type/octane is changed

 

On the other hand, you or I could have got a Stihl M-tronic. To calibrate one of these, you just remove the b+c, refit the clutch cover for safety, start the engine and let it run for 30 seconds with no operator input, then shut off the engine and it's done. All one has to do then, is refit the b+c, tension the chain and away you go.

 

How the heck can Husky's 'AutoTune' be so far behind Stihl's M-tronic?

Edited October 9, 2013 by TGB