Rebuilding The JMS 064

[Stihl working Hard]

View attachment 81554

I can feel my arteries hardening

 

[Stihl working Hard]

When are you coming to Atlanta Dan? That is at a local landmark called The Vortex. They call it "The Triple Coronary Bypass Burger." LOL

Ough I believe that

 

[paragonbuilder]

I chased my tail recently on a 10mm that had a new tank installed by a Stihl dealer. After the saw wouldnt run correctly they charged the fella for a new carb.

Saw still wouldnt run right. It landed on my bench. After messing with it for a bit a buddy questioned if the snorkel hole had been opened on the new tank. Thats all it needed and saw runs perfect. Dude got beat down by a dealer.

Pics of the snorkel hole Jon?


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[Stihl working Hard]

Redneck repair at its best.

Or worst

 

[dall]

Pics of the snorkel hole Jon?


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the 044 had 3 air filter bases i can get pictures in a little bit one was set up for no snorkel one had snorkel but was blocked off and the other has the opened snorkel

 

[paragonbuilder]

the 044 had 3 air filter bases i can get pictures in a little bit one was set up for no snorkel one had snorkel but was blocked off and the other has the opened snorkel

Is the air filter base part of the tank Dallas? Or is Jon talking about what wasn't blocked off on this 064?


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[dall]

What John was talking about and the piece that wasn't blocked off on the 064

 

[paragonbuilder]

What John was talking about and the piece that wasn't blocked off on the 064

Ok thanks Dallas, I was confused cuz he said new tank


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[BuckthornBonnie]

044 and 064 both have various af housings as Dall mentioned. So if you put a carb without a snorkel in, be sure to block off the opening.

 

[MustangMike]

Question:

I've seen some posts that imply saws had a failure because Jason used AM wrist pin bearings instead of OEM.

I have also seen posts reflecting other damage that was likely due to Jason not cleaning his cylinder grindings out of the saw.

Since I am currently running an AM piston pin bearing in my Flying Tiger 660, so far w/o any issues, is it likely some of those bearing failures were due to Jason leaving debris in the saw (instead of the bearing itself being faulty)???

Seems like a real possibility to me.

 

[Lone Wolf]

Question:

I've seen some posts that imply saws had a failure because Jason used AM wrist pin bearings instead of OEM.

I have also seen posts reflecting other damage that was likely due to Jason not cleaning his cylinder grindings out of the saw.

Since I am currently running an AM piston pin bearing in my Flying Tiger 660, so far w/o any issues, is it likely some of those bearing failures were due to Jason leaving debris in the saw (instead of the bearing itself being faulty)???

Seems like a real possibility to me.

One possibility. The other would be what maker of bearings in particular were used in the saws that failed
? I had a 200T into my shop a day ago and I squeezed an aftermarket bearing between my fingers and it snapped in half.

 

[BuckthornBonnie]

Question:

I've seen some posts that imply saws had a failure because Jason used AM wrist pin bearings instead of OEM.

I have also seen posts reflecting other damage that was likely due to Jason not cleaning his cylinder grindings out of the saw.

Since I am currently running an AM piston pin bearing in my Flying Tiger 660, so far w/o any issues, is it likely some of those bearing failures were due to Jason leaving debris in the saw (instead of the bearing itself being faulty)???

Seems like a real possibility to me.

Jason had at least one catastrophic failure due to an AM pin bearing (ported saw I think). I think he posted some pics but I'm not sure. It's possible, yes. Others have had issues as well. I'm done using 'em but I probably won't go back into saws that have them (5 or 6 I bet).

 

[Mastermind]

One thing to consider.....

Failures have happened on 066s with 288 pistons. One of the reasons might be because of AM wrist pin bearings........but it is important to note that the pin boss is wider in the 288 piston, and that allows the rod to shift from side to side. If a 288 piston is to be used on a 066 rod, then shims should be made to take up this width.

 

[Nitehawk55]

Most don't give this a thought but an engine as a piece of machinery is trying to destroy itself , things have to be right for them to run as they do .

Saw a video of a crankshaft of an engine running at high speed , the crank was flexing like it was rubber !!!
The unseen forces inside a chainsaw running at 14K are incredable , you really have to wonder how they don't all blow....hahaha !!

 

[Mastermind]

Here's the carb after a proper rebuild.



And some work on the muffler.

 

[BrokenSVT]

Here's the carb after a proper rebuild.

View attachment 81770 View attachment 81771

And some work on the muffler.

View attachment 81772 View attachment 81773

There's something wrong with the muffler. Where are all the boogered welds and splatter?

 

[dall]

Early 10mm 044 with no snorkel and later with snorkel

 

[sawmikaze]

So should i get the 288 piston outta my 660 ?

 

[RI Chevy]

View attachment 81774 View attachment 81775

Early 10mm 044 with no snorkel and later with snorkel

Nice! Are these your backup doubles of your originals? lol

 

[Mastermind]

So should i get the 288 piston outta my 660 ?

I'd talk to @tree monkey about it Ryan. He's far more experienced with that swap than I am.