Husqvarna 550xp new piston and cylinder?

[Jlgriff97]

Could somebody give me some advice on whether I need to replace the piston and cylinder or just the piston. Thanks

Edited August 7, 2023 by Jlgriff97

[adw]

What you have there is an ingress of something very abrasive, this has scored the inlet skirt of the piston, and also removed the nikasil coating around the inlet port( as seen by the shaded area around the port ) this now requires a cylinder and piston.

where and what have you been cutting?

[Jlgriff97]

I got it on eBay spares and repairs so I’m not sure what the saw has been up to 😂

[Jlgriff97]

What cylinder and piston would you recommend?

[adw]

You may well have issues in the bottom of the engine, possibly main bearing cage broken up as there are some groves on the transfer port side of the piston skirt.

[Jlgriff97]

Oh dear 😬

[adw]

I think the saw needs to be completely dismantled before you even consider fitting a new cylinder, it’s a mark 1 machine, not sure what you paid for it but this is not going to be a cheap repair, can you return it ? how was it described?

[Jlgriff97]

It was sold for parts, not working. I wanted a bit of a project, never changed a piston before let alone going down to the main bearings 

[spudulike]

That's a strange one, it looks like fine dust has got in past the air filter and taken off the Nikasil but then larger particles have scored the piston.

As Adw says, best make sure the mains haven't let loose causing the piston damage and would make sure the air filter is OK as the wear around the inlet port looks like finer particle damage.

 

[spudulike]

1 minute ago, Jlgriff97 said:

It was sold for parts, not working. I wanted a bit of a project, never changed a piston before let alone going down to the main bearings 

And that is how you either learn that you can do this or learn that others are better at it than you!