Stihl ts410

[Mull]

Stone cutter, while working with it today it stopped mid cut, and appears to have lost compression!

Previous to this it used to cut out momentarily, never actually stopped, just as if the stop button had been flicked off and on quickly.

Any pointers would be great.

[Rich2484]

Loss of compression would say piston ring failure.

 

As for the cutting out maybe it was something leading to the failure of the piston.

 

Best to remove the exhaust and have a look. Or get a tester on it.

 

The cut off saws are really bad for losing compression as for the job they are used for. Dirty horrible works. And as builders tend not to look after them. How long you had it?

[Mull]

Loss of compression would say piston ring failure.

 

As for the cutting out maybe it was something leading to the failure of the piston.

 

Best to remove the exhaust and have a look. Or get a tester on it.

 

The cut off saws are really bad for losing compression as for the job they are used for. Dirty horrible works. And as builders tend not to look after them. How long you had it?

 

 

A mate bought it off eBay about a year ago, I would say it's never been quite right since he bought it.

I used it today and it went fut!!

Haven't looked at it yet but am tempted to have a wee look just now.

Cheers Rich.

[Mull]

 

Can an expert eye detect anything from these pics?

[dig-dug-dan]

have you checked the decompression valve is operational?

[Mull]

have you checked the decompression valve is operational?

 

 

Aye, decompression is about the same when valve is engaged and disengaged.

[Mull]

Aye, decompression is about the same when valve is engaged and disengaged.

 

 

That may not mean it's working correctly I suppose?

[dig-dug-dan]

i had one fail on me once, and i simply replaced it and the saw worked fine. not saying thats the answer with your machine though. Hopefully one of the experts can shed some more light on it

[Rich2484]

Well the exhaust side looks good. There looks like some score on intake side, but by a picture it's hard to actually say if it's deep scoring.

 

 

The decomp could be a fault. Remove the rubber cover off it and put a small amount of washing up liquid around it and then pull over, see if it bubbles up.

 

It could only be the rings or the decomp on loss of comp. a comp tester will tell this easily.

[Mull]

Well the exhaust side looks good. There looks like some score on intake side, but by a picture it's hard to actually say if it's deep scoring.

 

 

The decomp could be a fault. Remove the rubber cover off it and put a small amount of washing up liquid around it and then pull over, see if it bubbles up.

 

It could only be the rings or the decomp on loss of comp. a comp tester will tell this easily.

 

 

Took decomp off, it appears to be ok, valve lifting and reseating.

Not a true test I know, but nothing falling apart.