Ugly Stihl 064 overhaul

[jacob j.]

No pain no gain, everything is at some kind of risk.

Yep, and packing out in some places is much easier than others.

 

[Kiwioilboiler]

Really Doc,
Modified in such a manner, it increases the velocity of the port. Which enhances the draw through the motor, allowing it to run more efficiently.
I didn't spend the money for a plasma cutter to go slower.
Saw runs better, job goes smoother, where am I going wrong here?

Does the same science apply on birdcage (not slr) Dolkitas Mr Shot?

 

[Stump Shot]

Does the same science apply on birdcage (not slr) Dolkitas Mr Shot?

Any two stroke.

 

[sawmikaze]

I've always left the cages in to maintain rigidity. I've seen too many mufflers rattle apart in the woods and then make a guy packout to the truck.

This.

 

[Maintenance Chief]

I usually just drill out front of the baffle with a step bit.
I absolutely take them out of the older poulan saws though, they choke the heck out of them.

 

[Loony661]

I usually just drill out front of the baffle with a step bit.

This is what I do too. I also remove any burrs just incase one comes loose.

 

[drf256]

If you guys say it works as a torque tube, I get it.

Saying it helps keep muffler rigidity, in this case, makes little to no sense to me.

Many later Stihl mufflers came with open cans. Unlike some other brand mufflers, they mount directly to the exhaust flange of the cylinder and also to the case via the bottom bolts. Granted, the newer open style cans tend to have a pressed in flange to aid in stiffness where it connects to the jug, but I only see that possibly aiding in sealing at the flange. When we are opening the can with a deflector for more flow, the gasses will take the path of least resistance and flow out the huge deflector.

Other than sealing the exhaust flange and/of adding some torque by extending ex port length, I don’t see how leaving the baffle in helps. Even with the new open muffler can designs, most of us grind out the increased rigidity of the flange anyway to make it match the port.

 

[rogue60]

For what it's worth with a stock Aussie ms660 I removed the baffle on the internet's advice is a must do mod apparently?? anyways it made the saw a very LOUD gutless turd yes it lost torque.
Saw was running .404 7pin bucking very hard Aussie hardwoods so any loss in torque was very noticeable.
It might work on a stock choked up US ms660 but can say in my experience a stock Aussie ms660 did not like this mod.

 

[redline4]

The original flat style fuel cap had a crack in it and the seal was shot. I had obtained a newer 066, I think, cap. Seeing the tether was different and no provision for it in my old tank, I modified it..


I took the link closest to the spring retainer and pried it open.


And pinched it around the ferrule on the not clapped out cap


And I now have a cap that stays with the saw vs falling in the dirt.
It ended up slightly longer then the original.

 

[redline4]

I took my custom fuel filter removal tool


And found out the fuel line isn't long enough to allow the filter to come out of the tank..

So, not very gently, I pulled the line through


And it looks good


New filter on

 

[Squareground3691]

I took my custom fuel filter removal tool
View attachment 399476

And found out the fuel line isn't long enough to allow the filter to come out of the tank..
View attachment 399477
So, not very gently, I pulled the line through
View attachment 399478

And it looks good
View attachment 399479

New filter on
View attachment 399480

That’ll work,

 

[redline4]

Some lube...


And I put the line back home


And noticed the check valve is missing..

 

[Squareground3691]

That’ll work,

Long forceps work good to ,

 

[redline4]

I put the trigger in


Then took it out because I forgot the spring..

And trigger and spring back in..


Presence lever fits in and hooks on the spring

 

[redline4]

Slide the cover on

Hold it in place


And install the screw

 

[redline4]

Long forceps work good to ,

Yup.
I've found it easier to fish it out of the smaller opening tanks with a hook vs forceps, at least for me.

 

[Maintenance Chief]

Some lube...
View attachment 399481

And I put the line back home
View attachment 399482

And noticed the check valve is missing..
View attachment 399483

Holley accelerator pump check valve is the same, if you got one of those.

 

[hacskaroly]

Either is better than doing nothing.

Well, now I know what I am doing tomorrow after work, will put the drill battery on the charger!

When I finally cracked my muffler, I was pleasantly surprised and disappointed at the same time...no baffle to remove....

 

[ferris]

Is that a front cover for the 046 series saws?

 

[hacskaroly]

Is that a front cover for the 046 series saws?

Yes, the one in my post is for a 046. I just finished putting it back together after taking it apart for a deep clean (super muddy, found at the dump). Have not had a chance to fire it up yet, but with new rings, it seems to have great compression!