660 repair

[firsttofight11b]

Just got word that I need a new cylinden, piston, fuel lines, and top shroud.

I'm not gonna pay the stihl shop $600 to fix an older 660.

There are a lot of 660 cylinder/piston kits on ebay. Any I should stay away from? Any recommendations?

 

[Adirondackstihl]

Use Meteor or OEM only.
I can get OEM cylinder kit for around $250.

 

[HuskStihl]

Put up pics of the cylinder. The dealers idea of unsalvageable may not be the
same as ours.

 

[Adirondackstihl]

Put up pics of the cylinder. The dealers idea of unsalvageable may not be the
same as ours.

You're so smart!
But not as smart as Landon

 

[firsttofight11b]

I havn't looked at it yet, but he says the rings are welded together so....

 

[mdavlee]

Rings melted to piston doesn't mean the cylinder is junk. If you want rid of it I'll pay shipping on it.

 

[ZeroJunk]

It is possible that Stihl policy is to replace the cylinder along with the piston whether the cylinder can be salvaged or not.
It is unlikely that the cylinder cannot be salvaged. So, a Meteor piston for $40 or thereabouts will get you back going the majority of the time.
That would be better than an aftermarket top end to me anyway.

 

[Adirondackstihl]

It is possible that Stihl policy is to replace the cylinder along with the piston whether the cylinder can be salvaged or not.
It is unlikely that the cylinder cannot be salvaged. So, a Meteor piston for $40 or thereabouts will get you back going the majority of the time.
That would be better than an aftermarket top end to me anyway.

I can get OEM cheaper than Meteor

 

[mdavlee]

I just ordered a 10 mm 044 piston for $48. I think the 066 is the same price.

 

[ZeroJunk]

You can buy them on eBay for less than $40 shipped. If you want to support the site sponsors I can understand that.

 

[firsttofight11b]

 

[Adirondackstihl]

That might clean up.
Who ground the intake and didn't re-bevel the port?

 

[firsttofight11b]

Previous owner would be my guess. I don't know how to go about cleaning it up. I will probably just get another cylinder and piston. Here is some pics of the piston. Do you think it failed because of the ring or from something else?

 

[pioneerguy600]

Air leak or tuned too lean, what ya all think?

 

[AKDoug]

Air leak or tuned too lean, what ya all think?

Looks lean.. but the lack of bevels on the ports doesn't help any.

 

[drf255]

That's fugly.

Do you thing the lack of bevel is why the intake side is only scored on the Bottom?

 

[Rookie1]

 

[pioneerguy600]

Looks lean.. but the lack of bevels on the ports doesn't help any.

True but the piston is scored wider than the exhaust port width and there is little to no scoring on the intake side piston skirt. I would like to see the cylinder cleaned up so the edges of the port are easier to see clearly. When I bevel the ports the intake side gets very little bevel,not even .0010 wide as the rings don`t travel over it and the exhaust port only gets a slightly little more bevel, hard to see without a good light inside a clean bore.

 

[whitedogone]

I have been running a mako kit. Moobs seems to like them on the 660. Mine has been gtg so far. I did use oem circlips with it.

http://www.weedeaterman.com/product_p/wemakotlst0087.htm

 

[angelo c]

whats the deal with the Decomp valve ?
is it just partially threaded out or is it farked up ?