Husqvarna 55 Rancher loses power in cut

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Megunticook

ArboristSite Lurker
Joined
Jun 8, 2019
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Location
Maine
2004 Husqvarna 55 Rancher, big loss of power in cut, RPMs drop. Chain sharp, tension adjusted. Fresh fuel. No smoke.

Figured I had the carb. mixture mis-adjusted, I riched out the H screw a little at a time to about 2 turns out from seated. I removed mixture screw limiters a couple carb. rebuilds ago. Tach. wasn't reading properly so had to tune as best I could by ear. When I first tuned it in December it was smoking a tiny little bit, but without the tach. I figured better a little too rich than too lean. Power seemed fine. I've run 5-6 tankfulls through it and just noticing the power drop now.

Brought saw to bench and pulled carb., disassembled, placed in ultrasonic cleaner. Pulled muffler and checked piston (replacement OEM cylinder/housing assembly I installed last spring, have run maybe 1-1/2 gallons through it since then). Piston looked like new.

Spark plug was mostly light gray but slightly dark on one side, but not all sooted up. Was installed new last year.

No carbon on muffler screen.

Intake manifold seemed snug and well fitted. I replaced that last spring.

What am I looking at here? Should I change fuel filter? Fuel line? What else could be causing this power loss?

I dropped a dead red oak today, maybe 16" diameter, got it about half bucked and I just couldn't cut through it anymore, the saw lost so much power. Frustrating!
 
I say it sounds like a clogged fuel filter-- you are not getting enough fuel under load.
 
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