550xp mk 1 help

[adw]

2 hours ago, spudulike said:

I don't like the look of all those streaks on the piston and if the decomp valve is OUT and the saw pretty much falls to earth when held by the starter then it is lacking a significant amount of compression.

The damage doesn't look like a heat seize so more likely, one of the main bearings has slowly failed....ouch.

Pull the cylinder off and take a closer look....if the compression is Way Down...as Elvis sang.

I agree it doesn’t look to good.

[pleasant]

That ring groove is badly smeared 

[Husqvarna King]

Thanks for the replies. Does anyone know roughly how much this would cost to put right and is that worth it compared to a new saw. It’s an older mark 1 550 with three years work (arb not forestry). I work for a small company and the boss doesn’t want to replace with another that may only last a couple of years, especially when there are much older trouble free saws. The saw is still on its original guide bar, that must show how little it has done.

its a pretty clean saw as you can see.. except inside the cylinder of course 😬

Edited January 18 by Husqvarna King

[adw]

Saw looks quite tidy, pulling it apart does not take long, it’s what you find once done, if the cylinder cleans up ok then a piston, however if it wants main bearings as well it will start to get very expensive.

piston £80

Bearing £33

Bearing £6

Seal £10.50

Gasket set £14.50

To give you some idea, all plus vat plus fitting.

[pleasant]

Agree with ADW. Although you need to establish the reason you have had this failure in the first place. If it's a simple case of you adding a weak fuel/oil mix, then a new piston and barrel will sort it. However if you have an air leak somewhere, then just fitting an new piston and barrel means the same will happen again.

[Husqvarna King]

6 hours ago, adw said:

Saw looks quite tidy, pulling it apart does not take long, it’s what you find once done, if the cylinder cleans up ok then a piston, however if it wants main bearings as well it will start to get very expensive.

piston £80

Bearing £33

Bearing £6

Seal £10.50

Gasket set £14.50

To give you some idea, all plus vat plus fitting.

Appreciate that, thank you

[Husqvarna King]

Looking for a replacement are the mark 2 550 the same or has that side of things been beefed up a bit is the 560/562 the same also?

[spudulike]

On 17/01/2024 at 18:20, Husqvarna King said:

Are you still doing work on saws Spud?

The very odd one if dropped off and generally for firewood....a morning a month is a busy one nowadays.

[adw]

4 hours ago, Husqvarna King said:

Looking for a replacement are the mark 2 550 the same or has that side of things been beefed up a bit is the 560/562 the same also?

The 550 mk11 is a completely different beast to the mark l, sorry too many changes to list them all , but better cooling, more power, the 560/562 is on a bigger platform so a lot different to the 550.

[Husqvarna King]

3 minutes ago, adw said:

 

 

27 minutes ago, spudulike said:

The very odd one if dropped off and generally for firewood....a morning a month is a busy one nowadays.

I thought that was the case, appreciate your advice though, and not just on this thread 👍

Edited January 18 by Husqvarna King