064, 066 MS650, MS660 info thread

[Woodwackr]

I have jugs, have to see what’s in my box of 064/066 covers

Need an early 54mm..or 2. I have plenty of 52s

 

[Woodwackr]

Got case halves matched up today, 9 cases. Still need to go over them in detail, looking for stripped bolt holes, cracks, etc. I’ll make what repairs I can do and throw the rest as is on eBay.
sorted all the smaller parts, including screws…sheesh…what a pain trying to read the tops
12.9 and 10.x. If I couldn’t read it under magnification it became a 10, lol.

 

[ManiacalMark]

Need an early 54mm..or 2. I have plenty of 52s

I’ll take a look, I know I have two non decomp thick base mahle.

 

[markds2]

Just heard this week that the 9640 003 1850 Oil seal 17x32.9x3.6 (PTO side crank seal for 064, 066 and MS660) is NLA on its own from Stihl. It is, however, still available as part of the full set of gaskets and seals, part number 1122 007 1053. Apparenetly as the MS660 has been out of production for over 10 years now parts are starting to become obsolete. My dealer also mentioned that the back handle/tank assy for the MS660 is also NLA.

 

[PogoInTheWoods]

I would suspect a certain level of inventory still exists among domestic US suppliers considering the number of units sold and still in professional use in the States.

Worst case, AM replacements are readily available.

 

[qurotro]

Just heard this week that the 9640 003 1850 Oil seal 17x32.9x3.6 (PTO side crank seal for 064, 066 and MS660) is NLA on its own from Stihl. It is, however, still available as part of the full set of gaskets and seals, part number 1122 007 1053. Apparenetly as the MS660 has been out of production for over 10 years now parts are starting to become obsolete. My dealer also mentioned that the back handle/tank assy for the MS660 is also NLA.

I believe the MS661 use the same PTO side seal. Probably Stihl got supply issues.

 

[markds2]

I believe the MS661 use the same PTO side seal. Probably Stihl got supply issues.

You are dead right, I have asked my dealer if it is temporary supply issue or permanent

 

[markds2]

I believe the MS661 use the same PTO side seal. Probably Stihl got supply issues.

Dealer has just emailed and said the 9640 003 1850 Oil seal now supercedes to the 9640 003 1851 oil seal on the NZ Spec 661C (MS661 C-M-Z). Same dimensions so no reason why it wont work on the 1122 series. He has no idea why it doesn't automatically supercede in the system on the 1122 parts lists.

 

[PogoInTheWoods]

I believe the MS661 use the same PTO side seal.

Indeed it does. My initial lookup for the part number was from MediaCAT which obviously didn't include the 661 in 2012. A quick check of my MS661 IPL shows the same part number.

 

[jmester]

I knew the day would come when we would be having these conversations. Sad day for sure. I feel that the 1122 series saws were some of the best saws ever made.

I have been stocking up on parts for a while. There is still a fair amount of supply. There is even some heated handle stuff if that is what you are into.

 

[jmester]

The flywheel side seal has changed also from 9640 003 1560 to 9640 003 1561.

 

[BrokenAgain]

Hey everyone. I just picked up a well used 066 that seams to run good but is missing a few parts and has a very wet muffler. Trying to id what year or anything about it so I get the correct parts. Thinking of getting a new OEM cylinder kit while they are still available. S/N is 133643975. The PO said they had a Stihl dealer put new bearings/seals in it but it doesn't really look like the case was split.

I really only wanted a 70cc saw but everyone is asking almost new prices around me

 

[BrokenAgain]

So, I'm in the process of fixing up this 066 I got. Its got a walbro wj35 carb on it which seems uncommon and others prefer the wj67/69. Should I be looking for a different carb? This saw is a short case poly flywheel model with the hd2 air filter setup.

I tore the clutch off since it's oil soaked behind it, figured it needed crank seals. The seals appear new but the oil pump was missing the plastic end plug, probably where the oil was going as the little I ran it the bar didn't get much.

Also, how do I tell if that wire that rides on the clutch drum for the oil pump gear is working as intended? Since I can't see inside once the clutch is on?

 

[Sauen]

So, I'm in the process of fixing up this 066 I got. Its got a walbro wj35 carb on it which seems uncommon and others prefer the wj67/69. Should I be looking for a different carb? This saw is a short case poly flywheel model with the hd2 air filter setup.

I tore the clutch off since it's oil soaked behind it, figured it needed crank seals. The seals appear new but the oil pump was missing the plastic end plug, probably where the oil was going as the little I ran it the bar didn't get much.

Also, how do I tell if that wire that rides on the clutch drum for the oil pump gear is working as intended? Since I can't see inside once the clutch is on?

Does your saw have a flat or rounded top cover?
The plastic end plug for the oiler is not to seal in oil, but to keep debris from interfering with the pump shaft and its adjustment. The oil leak is likely from the oil pickup tube not being sealed tight against the oil pump or the case.
A pressure and vacuum test wil quickly confirm the state of the seals.
For the oiler worm gear, the wire has to come out far enough to engage the clutch drum. You can line up the slot and drop the clutch drum on the saw, the lightly spin the drum and see if the worm gear rotates with the drum.

 

[Sauen]

So, I'm in the process of fixing up this 066 I got. Its got a walbro wj35 carb on it which seems uncommon and others prefer the wj67/69. Should I be looking for a different carb? This saw is a short case poly flywheel model with the hd2 air filter setup.

I tore the clutch off since it's oil soaked behind it, figured it needed crank seals. The seals appear new but the oil pump was missing the plastic end plug, probably where the oil was going as the little I ran it the bar didn't get much.

Also, how do I tell if that wire that rides on the clutch drum for the oil pump gear is working as intended? Since I can't see inside once the clutch is on?

Or you can take of the plastics around the drum to see the side of the drum and whether the worm gear wire is engaged in the slot

 

[BrokenAgain]

Or you can take of the plastics around the drum to see the side of the drum and whether the worm gear wire is engaged in the slot

There's no slot on the clutch drum for the wire to engage. It appears as though the last 1/8"+ of the wire was riding on the rim of the clutch drum. I'll check in the morning but when I pulled the oil pump off it was sealed pretty well against the pickup tube/seal. The output seal was a little hard but not super hard or brittle. I'll have to buy another mightyvac as mines in another state to do a vac/pressure test. The crank seals were not covered in any oil but the clutch did have oil on the shoes.

 

[BrokenAgain]

This is the saw

 

[Mad Professor]

There's no slot on the clutch drum for the wire to engage. It appears as though the last 1/8"+ of the wire was riding on the rim of the clutch drum. I'll check in the morning but when I pulled the oil pump off it was sealed pretty well against the pickup tube/seal. The output seal was a little hard but not super hard or brittle. I'll have to buy another mightyvac as mines in another state to do a vac/pressure test. The crank seals were not covered in any oil but the clutch did have oil on the shoes.

This is an 036 with the cover off, 066 won't look too different.

You can see the slot in the drum just below the brake band, the drive wire is just trying to poke it's head out.

Spin the drum around once, and you'll see the wire still in the slot if all is well.