I killed my Tree Monkey 066 in 6 cuts

[pro94lt]

Some have blamed the bar oil, nobody is pointing fingers at the 550xp?

 

[jmssaws]

Some have blamed the bar oil, nobody is pointing fingers at the 550xp?

Bingo

 

[paragonbuilder]

Hopefully it isn't foreign material in there....but if it's a chunk of ring...then there will be a score mark all the way up that side of the cylinder....in which case a new piston will not help.

I just had a ported saw of mine hang....after at least a year of hard use....and not much oil in the mix lol. Cylinder indeed is shot.

Which saw Matt?


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[Mastermind]

The damn Husky attacked it.

Why didn't I think of that?

The OP here only asked for advice on fixing this saw. Great attitude, willing to accept that he might not have tuned it correctly......good guy in my opinion.

 

[trooney]

Hes a real good guy. Had nothing but positives when dealing with him. Very polite too.

 

[Duane(Pa)]

There is a great lesson here.......cooler heads prevail. Unlike other forums.... I predict this is a slam dunk little harm and no foul.

 

[David Young]

Hopefully it isn't foreign material in there....but if it's a chunk of ring...then there will be a score mark all the way up that side of the cylinder....in which case a new piston will not help.

I just had a ported saw of mine hang....after at least a year of hard use....and not much oil in the mix lol. Cylinder indeed is shot.

You should sent it to @jmssaws
he said he fixes blown up ported saws for free now!

Jason now that you are working for free I bet your business will really take off. No need to thank me, one good deed deserves another and you are welcome!

 

[jmssaws]

I meant that if Scott don't have time and doesn't care I'll put a piston in it.
The exhaust will most likely need raised or the op could do it.

I'm working 7 days a week daylight till dark but could find 30 minutes to put a piston in so he could get his saw going.
I know trooney and was trying to help him not take work from anyone.

 

[Mattyo]

Which saw Matt?


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had an oddball 372 that did this, only worse. hooked a ring dead center on the exhaust. after looking at it again, I don't think I adjusted the exhaust port at all....not on this saw. ( think I only touched the lower transfers, smoothed them out ...) the piston ring hooked bad though, and tore out the top of the piston crown dead center. I had the saw on my bench just before it happened, and noticed the piston was completely dry... told the guy to up his oil in his mix. little while later it showed up, siezed....clank...nuthing. pulled the jug, and found the issue. bearings are still smooth, no debris down in the crankcase. I just tore the saw apart, and gave him the box of parts, we can use it as a parts saw for whatever else he needs. he used it hard though, for a year, tough to say what happened. too much carbon build up and the ring stuck? i dunno.

i'm sure either j or tm can fix this saw in a heartbeat, but the question will be ...whether or not that jug is salvageable

 

[Cut4fun]

WAG here. Your in WA. Where was saw shipped from? Elevation difference in carb tuning. ?

You put your mix in and didnt check carb tune or adjust to your mix or area?

I do that with everything new and used when they come in.

 

[Cut4fun]

After seeing the piston looks like it hung or something got in there. Not lean score.

 

[jmssaws]

I've hung rings in 3 customers Saws
One 066 which just needed a piston
A 394 and 395 though cost me a lot of money at the time.
I learned not to widen those. Lol
The 395 cut timber for 2 months before it did but the 394 happened when I was running it. Got the p&c and the crank and the pto side case. That one hurt me

 

[Cut4fun]

I hung one in a 166 race saw during a practice run.

 

[Duane(Pa)]

I meant that if Scott don't have time and doesn't care I'll put a piston in it.
The exhaust will most likely need raised.

For those of us that don't know, what will be lost/gained from this?

 

[jmssaws]

For those of us that don't know, what will be lost/gained from this?

What lost or gained? Power?

 

[Jimmy in NC]

For those of us that don't know, what will be lost/gained from this?

If the port was scared up high the resulting clean up will change the port timing slightly. Also if a little more curve is needed, same result.

Loosing blow down can loose torque but raise RPM. Not always, but can.

I won't speculate on this case... I will say the OP's calm attitude will help this end well. Lots of generosity out there already.

 

[paragonbuilder]

If the port was scared up high the resulting clean up will change the port timing slightly. Also if a little more curve is needed, same result.

Loosing blow down can loose torque but raise RPM. Not always, but can.

I won't speculate on this case... I will say the OP's calm attitude will help this end well. Lots of generosity out there already.

If the exhaust was raised to fix it, it would have more blowdown, no?


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[Adirondackstihl]

If the exhaust was raised to fix it, it would have more blowdown, no?


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Yes

 

[paragonbuilder]

Yes

Thanks, Jer. I thought I was loosing some marbles...


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[huskihl]

Only one I ever caught a ring on was my first port job, a 272xp. Bottom of the exhaust port was too flat and the ring shaved it on the way down. I caught it right away before anything bad happened. Fixed the port and put cabers in it and good to go.
This 066 looks like it caught the roof though. Or a chunk of muffler screen or an exhaust deflector nut