Stihl 064

[gillettadam]

Hi all,

Recently picked up a Stihl 064. Fairly tidy, but the top end is done. Definitely needs a piston and quite possibly a cylinder too. I'm thinking to put an 066 top end on it. When did the 064 go out of production as mine must be a very late one. I thought the 0xx series were discontinued around the year 2000 and replaced by the msxx0 series but this 064 has a 2002 date on it.

 

[farminkarman]

Hi all,

Recently picked up a Stihl 064. Fairly tidy, but the top end is done. Definitely needs a piston and quite possibly a cylinder too. I'm thinking to put an 066 top end on it. When did the 064 go out of production as mine must be a very late one. I thought the 0xx series were discontinued around the year 2000 and replaced by the msxx0 series but this 064 has a 2002 date on it.

I can’t answer your question, but having run a good 064 and a couple 660’s, I would probably stick with the 064 top end. The 064’s have better upper transfer ports.

 

[jacob j.]

The 064 was manufactured for some markets long after they were discontinued in North America - There's even the MS-640 variant that was sold in Asia for a long time. I'm with Greg - if you can salvage your 064 cylinder, it's worth making a runner out of. You would barely notice the power difference unless you are cutting much bigger material.

 

[gillettadam]

Okay, that is interesting that the 064 cylinder may have better porting. I will have to take a close look at the cylinder when I take it off. I'm no professional sawer, only a firewood guy with a severe case of CAD! I need to figure out what popped it first though, so will be giving it a good clean up and doing a pressure and vacuum test, and checking the carb over. I only picked it up on Friday so will probably be looking at it properly in a couple of weeks.

 

[gillettadam]

Well impatience got the better of me, I've just put it on vacuum test which it seems to be holding absolutely fine. Thought while I was waiting I'd take the carb apart and I think I've found the culprit! The saw is fairly tidy so I have a feeling it may have sat for a long time, and was brought back into service without being checked over properly. Definitely going to give the tank a good wash out, and replace the fuel filter and line before it goes back to service! Obviously will need to clean the carb out too! A shame that the piston was killed by such a simple thing.

 

[Sloughfoot]

That's one begrimed carburetor. There a fuel filter?

 

[mrxlh]

Okay, that is interesting that the 064 cylinder may have better porting. I will have to take a close look at the cylinder when I take it off. I'm no professional sawer, only a firewood guy with a severe case of CAD! I need to figure out what popped it first though, so will be giving it a good clean up and doing a pressure and vacuum test, and checking the carb over. I only picked it up on Friday so will probably be looking at it properly in a couple of weeks. View attachment 428351View attachment 428352View attachment 428353View attachment 428354View attachment 428355

That is a darn nice looking 064, glad you found the issue.

 

[Sloughfoot]

That is a darn nice looking 064, glad you found the issue.

I know I'd sink a small fortune in that one. For me money is no object getting a good looking saw running, but every penny spent prettying up a runner is a waste.

 

[gillettadam]

This saw is too nice! I would be amazed if there is more than 20 hours on this saw. I have started cleaning it up. Amazingly there was a filter on the end of the fuel line, and the fuel line isn't split either. I pressure tested it to see if it leaked as I thought it may be sucking debris in through a fuel line split but apparently not. I think a lot of the debris may well be aluminium corrosion so possibly some water got in at some point. Regardless it will be getting a new fuel line and filter along with the carb rebuild. While cleaning it up I found the plastic brake cover has been charred and the clutch springs are very sloppy which may be another reason why it had a premature death. Unfortunately the saw did not come with a bar and chain so I have no idea if it was run with a dull chain but the toasted brake makes me think it could well have been. I think this saw is going to be a bit of a costly one as it definitely deserves doing properly with genuine stihl parts, and I'm thinking of putting the larger clutch cover and heavy duty air filter on it possibly along with a dual port muffler once I have it running. I'm hoping to pull the cylinder tomorrow... I have included a picture of the piston, think I might be able to get it going with just a set of rings?!?!?!?

 

[Sloughfoot]

This saw is too nice! I would be amazed if there is more than 20 hours on this saw. I have started cleaning it up. Amazingly there was a filter on the end of the fuel line, and the fuel line isn't split either. I pressure tested it to see if it leaked as I thought it may be sucking debris in through a fuel line split but apparently not. I think a lot of the debris may well be aluminium corrosion so possibly some water got in at some point. Regardless it will be getting a new fuel line and filter along with the carb rebuild. While cleaning it up I found the plastic brake cover has been charred and the clutch springs are very sloppy which may be another reason why it had a premature death. Unfortunately the saw did not come with a bar and chain so I have no idea if it was run with a dull chain but the toasted brake makes me think it could well have been. I think this saw is going to be a bit of a costly one as it definitely deserves doing properly with genuine stihl parts, and I'm thinking of putting the larger clutch cover and heavy duty air filter on it possibly along with a dual port muffler once I have it running. I'm hoping to pull the cylinder tomorrow... I have included a picture of the piston, think I might be able to get it going with just a set of rings?!?!?!?View attachment 428577View attachment 428573View attachment 428574View attachment 428575View attachment 428576

Uh, no way in Hades.

 

[Woodwackr]

Pull the cyl. That piston is probably not salvageable, imo. After cleaning it up, measure it…most likely won’t be within usable specs. The cyl will probably clean up.
Inspect the bottom of the crankcase for debris. If water got in there it will have a mix of mag rot and carbon crystals…not good.
Am dealing with a Husky 390 with this problem.

Nice example of a late 064

 

[gillettadam]

Don't worry, I'm not seriously thinking of reusing the piston! It definitely will need replacing. Will pull the cylinder tomorrow and see what I find inside. Hopefully no water got into the cases, and with a bit of luck the cylinder will be savable too.

 

[Wood Doctor]

Five years ago I rebuilt a Stihl 064 top end that had no compression with an MS-660 P/C kit and it works fine today.

 

[gillettadam]

Good news, the bottom end looks really clean, and actually was quite oily so that's something. I guess it wasn't straight fuelled. The piston is an absolute write off. I think the cylinder will be okay, but there is an area around the exhaust port I am a bit concerned about. Looking at the wear on the intake side of the piston this saw has more use than I first thought, but has clearly been well looked after until recently.

 

[hacskaroly]

I think the cylinder will be okay, but there is an area around the exhaust port I am a bit concerned about.

I have a 391cylinder I am working on that looks like yours. I found a video that showed an option for removing aluminum without using acid. I gave it a try and I really liked the results!!! I will probably need a new piston and rings though.

 

[redline4]

The anti-vibration leaves a bit to be desired compared to the modern saws but done right, the 064 is a great saw.
I did a complete tear down thread on one and finished it off with it being ported by @Stump Shot
I think yours might be an earlier version due to the lack of the HDII air filter, but could be wrong on that.

 

[Woodwackr]

I have a 391cylinder I am working on that looks like yours. I found a video that showed an option for removing aluminum without using acid. I gave it a try and I really liked the results!!! I will probably need a new piston and rings though.

I’ve been using Randy’s technique for a while. It sure goes quicker than by hand.

 

[Woodwackr]

Good news, the bottom end looks really clean, and actually was quite oily so that's something. I guess it wasn't straight fuelled. The piston is an absolute write off. I think the cylinder will be okay, but there is an area around the exhaust port I am a bit concerned about. Looking at the wear on the intake side of the piston this saw has more use than I first thought, but has clearly been well looked after until recently.View attachment 428735View attachment 428736View attachment 428737View attachment 428738View attachment 428739

That cyl should clean up but, you won’t know if there is any bad gouging until you get rid of the transfer. Piston is toast.

 

[Wood Doctor]

To be honest, when things look that bad as shown on Post #14, I replace them both with a P/C kit. Just MHO.

 

[Woodwackr]

To be honest, when things look that bad as shown on Post #14, I replace them both with a P/C kit. Just MHO.

For the $300 the nos kits are going for on eBay I’d at least try to clean up that cyl. For a shop? Yea, labor would be high.