It lives again! The exploded 064

[blsnelling]

This is the 064 that exploded in my hands at 14,000 RPMs. I rebuilt it with a new crankcase, a new 13-pin big-end bearing 066 crank, a KS 064 cylinder, and a new Stihl piston. I took .037" out of the squishband and set the squish at .019". It has a modded muffler and DP cover. This cylinder has NO PORTING. It's amazing how well this saw runs. It tunes out to 14K and has a powerband from 9,000-12,500 RPMs. I'll be going back in a porting this saw at a later time.

 

[blsnelling]

About the crankshaft that's in this saw.... In the beginning, Stihl used the same crankshaft in both the 064 and 066. They later went to a larger big end rod bearing...still a metal flywheel saw. This crank became standard for the 066 while the smaller one was used in the 064. I wanted the bigger rod bearing in this saw. There was debate on whether or not it would fit. As it turns out, it fit perfectly.

 

[alexcagle]

 dig it.

 

[blsnelling]

About the crankshaft that's in this saw.... In the beginning, Stihl used the same crankshaft in both the 064 and 066. They later went to a larger big end rod bearing...still a metal flywheel saw. This crank became standard for the 066 while the smaller one was used in the 064. I wanted the bigger rod bearing in this saw. There was debate on whether or not it would fit. As it turns out, it fit perfectly.

BTW, this was all before the changes made when they went to the poly flywheel.

 

[smokey7]

Did you ever find out what really caused the saw to let go. My favorite part of the whole thing is finding out why and what happened. Thanks for posting.

 

[blsnelling]

Did you ever find out what really caused the saw to let go. My favorite part of the whole thing is finding out why and what happened. Thanks for posting.

The piston failed, possibly due to too much material being removed.

 

[Chainsaw Jim]

Too much material removed? What's the history on the saw? Was it ported and the piston was ground on? or it wore thin?

 

[blsnelling]

Too much material removed? What's the history on the saw? Was it ported and the piston was ground on? or it wore thin?

There's a LOT of history on this saw, lol. It was sent to me by one of my customers, built by someone else, sold by someone else, yada yada yada. Bottom line, it exploded when I went to run it. It most likely failed due to a modified piston.



http://photo.blsnelling.com/Chainsaws/Jobs/Stihl-064066-GRENADED/n-z7k9ps

 

[drf255]

That's a bad sound.

 

[LowVolt]

It blew up because the chain was loose.

 

[Full Chisel]

All that piss revving and unloaded WOT did it in, Brad! Put the tach down and cut wood!

Those old KS cylinders do rip.

 

[Guru LLC]

Interesting on the crank...that one is the one that is hard to find I think. No seal exists to use the poly flywheel crank in that case if memory serves.....

 

[Bob95065]

Do you have a build thread for this saw?

 

[blsnelling]

Interesting on the crank...that one is the one that is hard to find I think. No seal exists to use the poly flywheel crank in that case if memory serves.....

It came from Robin Woods, NOS. I've never seen one before. I had to hunt this one down.

 

[blsnelling]

Do you have a build thread for this saw?

No I do not.

 

[Bob95065]

I have a basket case that is either a 066 or a 064. What are the differences?

 

[BuckthornBonnie]

Clutch side case will have oil outlet cast in for 066. 064 requires oil line.

 

[jmssaws]

I have a basket case that is either a 066 or a 064. What are the differences?

066 has a different cylinder cover, wide flywheel and starter and has a different oil pump as stated above, also it's 54mm instead of 52.

 

[Wood Doctor]

Every 066 I ever worked on has a decomp valve on the cylinder but my "new" 064 does not. Therefore, in my case, the 064 begs for a larger, more comfortable pull cord handle or an owner with a stronger grip. Maybe I could borrow Brad's biceps once in awhile.

 

[JTM]

Hey mister, are going to by chance be selling that do hickey?