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Chainsaw issue

H

hellpig

New User
Husky 445, has always started 2nd pull.
Fired it up the other day, let it warm up a minute.
Won't go past about 1/2 throttle, even if you ease or sneak up on it.
Will idle without skipping a beat for 10 minutes, and beyond.
Changed air filter, but it was clean.
No carbon buildup in exhaust, but cleaned it anyway.
Changed fuel filter.
No difference. Primer bulb staying full, and light push as try to rev does nothing.
Does rev all the way when first started cold, but then, not past half.
Thoughts?


N
 
I don't think it's the sparkplug, but that's a cheap and easy thing to do, and you should have a spare anyhow! The next thing I would do is
put some Seafoam in it. I suspect the high speed jet is partially plugged, if you can adjust it open it up a little until it runs properly,
and after the Seafoam cleans out the jet you may have to set it back near where it was. Last summer my cousin was helping me cut some wood
with a new Husky, and it really sounded lean. Good luck! Let us know what the outcome is.
 
i would try another spark plug to eliminate that. if your saying you push the primer and it dont speed up then it must be electrical.
 
Mixed fresh fuel, and added seafoam, let it idle10 or 15 min.
Rain it some more today, still dead past 1/2 throttle.
What confuses me is cold start, it's all scream for a few seconds, then lay down.
Thought maybe a week coil, but revs fine when first started.
 
with the saw idling, spray some carb cleaner at the carb base gasket and see if there is a change. may need a new gasket, or the gasket on the fuel
pump side of the carb is bad. just went thru this with my husky 141.
 
Does partial choke help?

Did you try backing out the high speed screw?

Could be weak spark.

Usually it's fuel problems. The metering diaphragm, the one that operates the needle valve, gets old and hard. It must be very soft and flexible to work properly.
 
The longer it runs a bad coil will show its self. Coils as they are used get hot and in doing so if there going bad the bad shows up the longer it is run
 
Gas blowers and string trimmers will act that way when an old fuel line has cracked or split.
 
New plug didn't do it. Same as before,
screams for 2-3 minutes or so, then won't
go past 1/2 throttle.
Choke partially on same.
Bulb stays full, slight push doesn't help,
so thinking not fuel issue.

May try to find some Husky fuel line ( have
had issues with generic line in other
Huskies) and if that don't do it, maybe try
coil?

Appreciate all the help
 
I would take the air filter off and when you have the throttle wide open spray a little gas
in the carb. If she screams you know it is fuel not getting in. Also make sure the linkage
isn't falling apart somewhere and getting caught up somewhere.
 
I have found that a piece of 1/4 od plastic tubing works ok, just shove it on the splined screw. Although some of them have stops to prevent them from being opened up too much and smoking.
 


My Husky was having worsening starting problems so I was on Jack's to order a carb kit and there was a complete carb for $2.50 more. Only around $23.00.
 
If your chainsaw has those plastic tube cover around the adjusting screws,you can pull those out with a needle nose pliers, so once you pull them out you can adjust the carb as much as you want.Those plastic tube covers have a stop so you only can turn the adjusting screws so much.
 
Have you done a compression test? Husqvarna saw engines need to develop about (at least) 135 psi to run well.

Check your fuel line, its pretty common for those to get pinholes in the fuel line between the tank and the carburetor. A pressure/vacuum tester will tell the story pretty quickly, but don't go over 7 psi, much above that will push the
needle valve in the carb. open. Below 7 psi it should hold pressure.

After that, try adjust the carburetor. The rear screw is for the high speed circuit. If it takes more than 1/2 turn of the screw something else is going on. Either the carburetor is plugged or its not getting fuel for some other
reason. As already been stated, it could also be an air leak that is leaning the mixture out.
 
Thanks.
What gets me is, it will scream to fill rpm on a cold start, but after a couple minutes, will not go past half.
Even if I push primer bulb a little.
Or shut off and restart.

Which makes me think maybe coil?
Won't get a chance to fool.with it sgain for a few days.
Thanks to all.
 
Clamp it in a vice. You need 3 hands to do this. start up and run it up to where it about to bog down, then use your thumb
to "thumb choke" into the carb. This will seal off all air from coming into engine. Let up when the engine is about to shut
off. Do this several times. you may want to open the low and hi speed jets about a quarter of a turn as well. What this
does is pumps a lot of gas past the needle valve and jets thus cleaning it. Did i say remove the air cleaner first? It is a
cheap attempt to fix.
 
I would second that on the plug,dont know why but quite often its the problem. I dont know why people want to
start adjusting the carb,unless someone tinkered with it shouldnt need adjustment.
 
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