550xp exhaust port

[breese]

JMS Involved?
(Sorry, just had to.... )

 

[Adamski]

Dang if that dont look like a roller bearing

I'd cut the chamber to clean her up, then cut the base for 0.019 squish with the gasket. Slap in a new piston after carefully making sure the wrist pin bearing aint missing a roller

I checked the wrist pin. Looks oem and decent. All pins there. I thought as much with a needle roller. Hard to see the crank end bearing though. Rotated cleanly. I’m not sure what has gone on..

 

[Onan18]

Dang if that dont look like a roller bearing

I'd cut the chamber to clean her up, then cut the base for 0.019 squish with the gasket. Slap in a new piston after carefully making sure the wrist pin bearing aint missing a roller

Entire cylinder kit is cheaper than just the piston.

 

[Tor R]

Something has been swallowed... View attachment 94959View attachment 94960

And the ring is stuck solid in the groove..

But the bore is clean.. can this cylinder be salvaged and get a new piston kit. Not sure what it has swallowed as the needle bearings are all sweet as.

check both the wrist pin bearing and the con rod bearing, that looks to be marks from a roller.
Unfortantly, I've seen to many blown conrods bearings on them 550's, 40-50 hour saws with blown conrod bearing

 

[Adamski]

check both the wrist pin bearing and the con rod bearing, that looks to be marks from a roller.
Unfortantly, I've seen to many blown conrods bearings on them 550's.

I’ve just been looking with a torch and a pick every pin. I can’t see one missing or witness marks of one popping between the cage and the crank lobes.. perplexing me this is

 

[Adamski]

View attachment 94978


Entire cylinder kit is cheaper than just the piston.

What a joke..

 

[Tor R]

I’ve just been looking with a torch and a pick every pin. I can’t see one missing or witness marks of one popping between the cage and the crank lobes.. perplexing me this is

most of the times when a piece come from the bottom part it hit one of the transfer ports, if them ports and piston sides are prestine maybe them fools dumped down a pin through the plug hole.....
Them main bearings has nylon cage, I thought when I saw the pictures that its part of a roller, hopefully I'm wrong

 

[concretegrazer]

Something has been swallowed... View attachment 94959View attachment 94960

And the ring is stuck solid in the groove..

But the bore is clean.. can this cylinder be salvaged and get a new piston kit. Not sure what it has swallowed as the needle bearings are all sweet as.

Did you put the new plug in or someone else?

 

[Adamski]

most of the times when a piece come from the bottom part it hit one of the transfer ports, if them ports and piston sides are prestine maybe them fools dumped down a pin through the plug hole.....
Them main bearings has nylon cage, I thought when I saw the pictures that its part of a roller, hopefully I'm wrong

I’m starting to think the previous owners used some sort of hard wire as a piston stop and chobbled the end off in the cylinder and left it. And screwed it up that way?

 

[Adamski]

Did you put the new plug in or someone else?

Someone else

 

[Ronaldo]

I’m starting to think the previous owners used some sort of hard wire as a piston stop and chobbled the end off in the cylinder and left it. And screwed it up that way?

That scenario makes sense.

Sent from my SM-S320VL using Tapatalk

 

[Tor R]

I’m starting to think the previous owners used some sort of hard wire as a piston stop and chobbled the end off in the cylinder and left it. And screwed it up that way?

yup, its defently possible, we have seen people using piston stopper through the exhaust port
The pictures I saw made me think about a roller, but the marks are so big that it pretty much has to be a full roller, and that you should easily rule out, doubt a roller can fly through the whole system without toutching a transfer port.

Since the muffler threads was ripped on one of the sides, was the muffler loose?

 

[Fruecrue]

Shake the muffler.

 

[super3]

Did you put the new plug in or someone else?

This ^^^

Ground strap from the old plug.

 

[Chainsaw Jim]

Spark plug failure. Most of the the marks seem to match the shape of the ground electrode.

The top ring land on the piston has been hammered out of shape and could be cracked. Running it is not a risk I'd take.

 

[Adamski]

yup, its defently possible, we have seen people using piston stopper through the exhaust port
The pictures I saw made me think about a roller, but the marks are so big that it pretty much has to be a full roller, and that you should easily rule out, doubt a roller can fly through the whole system without toutching a transfer port.

Since the muffler threads was ripped on one of the sides, was the muffler loose?

Muffler thread holes are ok both side. The picture for some reason makes the one look cross threaded. They are both fine. We’re both tight, in the muffler we’re bits. Nothing big enough. Maybe smashed up now. The case is clean too.

 

[Mastermind]

Get a new top end.......it's worth it.

@Onan18

 

[Adamski]

@Onan18 I have pm’d you

 

[Sty57]

Dang if that dont look like a roller bearing

I'd cut the chamber to clean her up, then cut the base for 0.019 squish with the gasket. Slap in a new piston after carefully making sure the wrist pin bearing aint missing a roller

The sad part is, the piston kit is stupid expensive.
It's makes more sense to get the cylinder kit to me. Unless you are really pinching pennys.

I did put a LRB piston in one 550 and it was a decent replacement for the money.

 

[Onan18]

The sad part is, the piston kit is stupid expensive.
It's makes more sense to get the cylinder kit to me. Unless you are really pinching pennys.

I did put a LRB piston in one 550 and it was a decent replacement for the money.

Just the piston is MORE than the complete cylinder kit from Husqvarna.