Intermittent compression? Husky 550xp

[Rich2484]

Thats bad news.

What causes the scoring?

Can I still use it next week for my 5 day chainsaw course, or is the damage likely to become terminal?

 

Terminal I'm affraid. About now there is a good chance of saving the bore as unless it has scored it deep it could just be ally transfer.

 

Keep going with it and it will score even deeper, be under powered and useless. And nothing worse than a saw seizing up good and proper half way into a felling cut.

 

The seize most likely cause is running lean or neat fuel into it.

[Great_American]

ouch. Thanks for helping, I really didn't want to hear that!

I hope it can be saved, I bought it on Ebay because the budget is tight at the moment.

I've been mixing the fuel carefully, its only done about 5 litres since I've had it.

Could it have been like this for a while?

[Rich2484]

ouch. Thanks for helping, I really didn't want to hear that!

I hope it can be saved, I bought it on Ebay because the budget is tight at the moment.

I've been mixing the fuel carefully, its only done about 5 litres since I've had it.

Could it have been like this for a while?

 

Possible. Or there could have been another issue with the saw. Maybe it was running lean on the carb settings.

 

Could have been another issue.

 

It's fine fixing the saw with a new piston, but you would need to find any underlying reason as to why it has seized on you.

 

Not sure if it could have been doing it before hand. These things can happen suddenly or over a short period of time.

 

It can be saved. But again need to find the cause of this aswell as fix it, or you will fix it and it could happen again.

[SteveA]

Which oil did you use and at what mixture?

[Great_American]

groundsman - rockoil - at 50:1, like the guy in the shop said.

How much out do you have to be with mix for it to do this?

[GardenKit]

If the saw was OK when you bought it you would have to be a long way from 50:1 to cause this. The Rock oil is actually tested at 80:1.

 

I bet it was dodgy to begin with, that is why it was on the bay.

 

But the damage is done. DO NOT use the saw again. It will only get much worse, quickly.

[SteveA]

50:1 is spot on. Sorry but it does seem like you've bought a bad one.... plenty of bad (and fake) chainsaws on ebay.

[alros01]

hi I had a 560 like this and it was the carbon build up in the port that scord the piston on mine that's why I take the exhaust off and clean all the build up on my saws.like everyone else has said take the saw apart if you can do it yourself.but if you can not then I wouldn't like to see what it would cost you to have it done.they are not that hard to do

[wyk]

That is a lot of carbon built up for less than three years with an AT saw. It must have been used a lot or maybe with a heavy mix. I'm surprised you didn't notice it was down on power. If you intend to buy used saws, one of the best tools to have is a compression tester.

[Great_American]

hi I had a 560 like this and it was the carbon build up in the port that scord the piston on mine that's why I take the exhaust off and clean all the build up on my saws.like everyone else has said take the saw apart if you can do it yourself.but if you can not then I wouldn't like to see what it would cost you to have it done.they are not that hard to do

 

I'm not too bad with mechanics (drive a landrover), and can swap parts ok.

What worries me is cleaning the bore out, I have read about using acid, I think thats a bit of a push for me. Getting it fixed here will cost minimum 200.

 

On the other hand I can't afford to buy another saw.