The famous 550xp.

[TreeswingerPerth]

We have an early one , been in for some software update and that's it . We use Aspen fuel and have had no issues with our two 560's either .

 

By the way , we removed the spark mesh things when the saws were new .

[Alycidon]

The new XPs should only be used with Huskys synthetic 2 stroke mix, this is blue. The Husky manual doe snot say that but when my engine seized a few weeks ago after about 20 hours they blamed the poor quality 2 stroke oil I had been using, This was the Sthil mineral based red oil, sold to me by the dealer with the saw !!. This is to the Husky spec but needs using at 33 -1 not 50-1.

 

A

[CJM]

I run my 550 560 and 540 (piece of sh*t) on red stihl 2 stroke oil. They work perfectly fine no issues in the last 2 years.

[Eddy_t]

The new XPs should only be used with Huskys synthetic 2 stroke mix, this is blue. The Husky manual doe snot say that but when my engine seized a few weeks ago after about 20 hours they blamed the poor quality 2 stroke oil I had been using, This was the Sthil mineral based red oil, sold to me by the dealer with the saw !!. This is to the Husky spec but needs using at 33 -1 not 50-1.

 

A

 

 

That's a load of BS, any of the top-end oils can be ran at 50:1, maybe you should have ran the saw in on aspen first, as husky will cover seizes, air leaks and similar under warranty. 33:1 would really coke the ports up, I've seen how bad they are after about 35 hours running 50:1

[wyk]

That's a load of BS, any of the top-end oils can be ran at 50:1, maybe you should have ran the saw in on aspen first, as husky will cover seizes, air leaks and similar under warranty. 33:1 would really coke the ports up, I've seen how bad they are after about 35 hours running 50:1

 

Never had problem with coking at 32:1. In fact, it is all I run. 50:1 in a saw, like a 550 XP, that uses less fuel to start with than previous generations is asking for trouble, if you ask me.

[sawdusty surfer]

My 2012 550xp needed a rebuild and new ring after 220 hrs use. The main dealer that did the work said it was coked up and said it was because I wasn't running it with Husky XP oil.

[Eddy_t]

Never had problem with coking at 32:1. In fact, it is all I run. 50:1 in a saw, like a 550 XP, that uses less fuel to start with than previous generations is asking for trouble, if you ask me.

 

 

It's odd tbh wes, I've got quite low hours on my 560 (MUCH less than I expected from it's usage), yet it has substantial coking around the exhaust port, a hell of a lot more considering the saw hasn't done 50 hours yet!

[wyk]

It's odd tbh wes, I've got quite low hours on my 560 (MUCH less than I expected from it's usage), yet it has substantial coking around the exhaust port, a hell of a lot more considering the saw hasn't done 50 hours yet!

 

Never used a 560 for any length of time, nor any other AT saw.

 

When you say coking, do you mean there's a heavy coating of carbon inside the actual exhaust port? I port, or have ported, every saw I personally use, and these all get the polished exhaust port treatment. However, having said that, a little bit of coking in the exhaust is not any where near as bad as a little bit of burning on the bearings.

 

Also, when you say low hours, do you have an hour meter/tacho gauge attached to your saw? I was considering permanently attaching a TTO or WORKS gauge to one of my saws to keep track of usage.

Edited September 24, 2014 by wyk

[Eddy_t]

Never used a 560 for any length of time, nor any other AT saw.

 

 

 

When you say coking, do you mean there's a heavy coating of carbon inside the actual exhaust port? I port, or have ported, every saw I personally use, and these all get the polished exhaust port treatment. However, having said that, a little bit of coking in the exhaust is not any where near as bad as a little bit of burning on the bearings.

 

 

 

Also, when you say low hours, do you have an hour meter/tacho gauge attached to your saw? I was considering permanently attaching a TTO or WORKS gauge to one of my saws to keep track of usage.

 

 

The autotune/m-tronic saws record run time, when plugged in the saw was on 41 hours, max rpm on the last use was 14172rpm, blah blah blah...

And yes, a fairly thick, about half a mil or more.

But the ports are tiny on this saw and I assume it makes up for this by throwing a fair bit of fuel through the carb, especially as the narrow Venturi would suck plenty through.

[wyk]

The autotune/m-tronic saws record run time, when plugged in the saw was on 41 hours, max rpm on the last use was 14172rpm, blah blah blah...

And yes, a fairly thick, about half a mil or more.

But the ports are tiny on this saw and I assume it makes up for this by throwing a fair bit of fuel through the carb, especially as the narrow Venturi would suck plenty through.

 

Yeah, they have tiny everything.

 

Half a mil is a lot. I wonder if a different mix would help. I haven't followed what mix you're using. Is the Exhaust MM'd? That may help some.