Husqvarna 445 Carburetor Adjustment

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S

Snerdguy

Member
Feb 9, 2012
11
Ohio
I have had my 445 for years and had to replace the carburetor and now I am going through the fits of adjusting it to run right. I got it to the point of the saw revving up and then dying after priming and am having trouble getting further. Is there any kind of definitive adjustment procedure available on line?

Because it's a new carburetor, I started by turning the H and L screws all the way in and backing them each out by one and a quarter turns. So, the saw fires up and then dies after priming which is an improvement over previously refusing to start at all.
 
I am not an expert, but I think you need to open up the L screw a little more. H should be adjusted to where to saw screams and then it should be closed until it bobbles a bit, so you don't over rev it.
 
Youtube has many videos on "How to tune a chainsaw". mweba1 has a good one.
 
yep, your L limit is too low. You really shouldn't have to touch the L screw, but fine adjustments on the H is what will effect performance. I would also check your fuel lines. I thought it was my carb in my 445, but it turns out my fuel pickup line was a little kinked while running through the body. It also had a crack at the very bottom.
 
Having a tachometer helps for tuning saws as well. I got a cheap one on amazon and it works great. Takes the guesswork out of the maximum RPM and doesn't make you go deaf trying to listen for it.
 
A Tach is nice to have as a tool.
But to be safe you have to tune by ear to make sure that your are not to lean on the top end.
4 Stroking out of the cut and clearing up once you start cutting.
 
salecker said:
A Tach is nice to have as a tool.
But to be safe you have to tune by ear to make sure that your are not to lean on the top end.
4 Stroking out of the cut and clearing up once you start cutting.
Click to expand...

Agreed, 4 stroking out of the cut is the best indicator. I find that the tach helps me from adjusting it too rich at the top end and leaving RPM/power on the table.
 
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