Husqvarna trimmer won't rev up?

Won't cycle up to full revs

Bundu
June 2016

Too much oil in the fuel.

gideon
July 2014

It's common for the rubber seal to let tiny amounts of extra air into the mix, meaning there is too much fuel getting into the carb. My husky saw does this, if you try and rev it and shake it up and down at the same time it should rev in time with your movements if this is the case. Solution... silicone sealant

feraljay
June 2013

Have you got the flexible rubber seal between the carb and engine block like on husky saws?

feraljay
June 2013

But Stihl!

Jeb Bush
March 2009

Dave
I have the same problem with mine, I am pretty sure it is something to do with the choke mechanism moveing out of position.
Time for a service.
Daryl.

daryl
March 2008

Dave,
You welcome
You have a carby problem!
The first questions were to elimate obvious issues.

If your air filter, or exhaust were impeded, and your motor was running you would think the engine is over fuelling when its not.

The questions on fuel starving were to understand if the HS speed circuit was at fault causing over fuel at Idle.

I am not familiar with your machine, but I have assumed it has a carby like a walbro or tillotson saw carby.

By the way both HS and LS needles interact through the whole throttle range, and what looks like a rich low end needle setting, could be a float setting on main needle.

Carby
Few simple things to know:
After kitting, you should set to standard settings, 1 3/4 -2 turns out usually on both LS and HS.

Over fuelling at idle is usually caused by either a worn out main needle, or crap under the needle, a "stiff" diaphram, air leaks, or the the float needle and seat height setting.

Some guys do a carby kit and dont realise how important it is to replace the main needle. some dont blow the carby out, and it is very easy to make an error with diaphrams during assembly

Main needle height setting is most critical!

Most blokes don't know you have to "set" the height of the needle, and there is a guage for it. With out the guage, it is done by trial and error, and its a bit tedious.

By hand you need to know that acutating lever should be almost parallel to the base, and that will get you close.

I run all two strokes on stihl 50:1 mixed at 40:1.
Good quality oil is important, but is not related to over fueling.

Good luck

Jed
February 2008

Jed,

Thanks for your suggestions. I tried everything you said and still had the same result...always flooding. The only thing else that I wonder about is does it matter what kind of oil I use to mix with the gas. I have never used Husky oil and had no problems but is it possible that I have a different brand and that is my problem. Also, just out of curiosity, when an engine appears to be flooding, why is it the you suggest there is a blockage somewhere? It seems intuitive to me that it is getting too much gas and a blockage would not cause it to get too much gas. Thanks for your help.

Dave
February 2008

forgot one Dave

7. Sticky choke mechanism, or butterfly not fully opening

Jed
February 2008

Ideas Dave

1. HS jet is impeded, did you soak the carby and blow it out
2. Look for damage on end of HS needle
3. Did you set the carb to standard settings
4. Air filter dirty underneath
5. Exhaust is partially blocked
6. In tank fuel filter is partially blocked

Jed
February 2008