Husqvarna 455 Rancher Running Poorly

[JR_sawing]

The top plug has been in the saw for 4-5 years, the bottom one for maybe 15 minutes of run time. I'm guessing a piston ring gave out, but I'm not super knowledgeable about engines, so I'm looking for a second opinion.

The saw ran great until it didn't. It was a sudden change. The only problem I ever had with it, is that it would sometimes refuse to start after running for a while. But if I let it sit upright for a few hours, it would always start again like nothing happened. That's probably unrelated but I'll mention it.

With the new plug, the saw was able to briefly cut again but the power fell off after cutting a few limbs. I tried adjusting the high and low speed needles, but it didn't make any difference.

I figure I'm at least in for an engine rebuild, if the cylinder wall isn't scored and unsalvageble. What do you think?

 

[Wood Chopper]

Running rich as hell. No we figure out why. How many turns clockwise can you turn the H Screw till it seats closed? I know you said you tried adjusting just trying to gauge where it is at.


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[Steve]

Pull the muffler and check the piston and cylinder. My bet is it has run lean and scored. Compression is low which can give you the same result on the plug. Unburnt fuel and too rich are one in the same.

 

[ManiacalMark]

Pull the muffler and check the piston and cylinder. My bet is it has run lean and scored. Compression is low which can give you the same result on the plug. Unburnt fuel and too rich are one in the same.

Well put!

 

[JR_sawing]

Wood Chopper - When I finished trying to adjust the saw, I had the needles turned all the way to the back of the saw. That isn't how I normally ran it though, and I tried turning them both halfway to the front or all the way forward. It didn't make any difference.

Steve - It looks like it takes a hex head screwdriver to get the muffler off. Any idea what size?

 

[Michael Rupley]

rebuild the carburetor and put new mix and fuel in the saw

 

[JR_sawing]

I ordered a set of hex head screwdrivers. I'll look into the carb if the cylinder is good.

 

[Steve]

I ordered a set of hex head screwdrivers. I'll look into the carb if the cylinder is good.

Ordered? Just go to the hardware store and buy a set.

 

[JR_sawing]

It's not just down the block. Mail order makes more sense for me.

 

[Steve]

It's not just down the block. Mail order makes more sense for me.

Bet a trip to the store is about 3 weeks faster than usps right now.

 

[JR_sawing]

I've ordered bunches of stuff lately and it's all getting here in a few days.

 

[Steve]

I've ordered bunches of stuff lately and it's all getting here in a few days.

Lucky. If we order anything shipped usps it's next month!

 

[kneedeepinsaws]

Easiest solution is replace it. sounds like this is gonna be quite a bit of work to figure out and get going properly again. If your needle adjustments dont make a difference then there are underlying issues that take time and knowledge to figure out.

If your game your gonna have to at the least pull the cylinder and see whats going on like the others have suggested.

 

[JR_sawing]

My tools came in a couple days ago but I haven't managed to break the muffler bolts loose yet. Maybe another night of soaking in Knock 'er Loose.

kneedeepinsaws - I bet you're right. Probably get another one and work on this one over the next few months.