MS661 Love/Hate

[mdavlee]

Been leaking somewhere to have mix there.

 

[Brewz]

Yep that's what I am thinking.
I'm thinking intake boot.

Does anyone have an IPL?

 

[Moparmyway]

Picture of the old intake ?

 

[Redbull661]

I have the saw now and apparently it was one of the first saws when they were released.

I pulled the top cover off and found the top and back of the cylinder coated in unburnt 2 stroke oil.

Pulled the cylinder off and everything looks fine but the oil is only on the back around the intake boot and spread up and over the top?

It's wet around the intake
View attachment 57081

And on top. Spark plug and decomp are fine, no leaks
View attachment 57083

Front is dry
View attachment 57082

And I believe these guys make good cylinders?
View attachment 57084

i'll guess old stlye intake boot with washers inside. can we see a pic of boot and inside boot. thx

get 4701A coil + straight intake boot and then reset the saw. Cut with it for at least a tank if not two.

another indication is the cylinder will be marked 1144B went to 1144C. I could never get Stihl to tell me a difference if any.

saw is probably from 2013 - so it could stand to have a new plug, fuel filter, and check if it needs a carb kit. ...might as well cover a few basics before you go chasing your tale. But the boot and coil are a must.

 

[Brewz]

 

[Brewz]

There is nothing inside the boot that I could see or feel

 

[angelo c]

my guess is it leaking from the decomp button or area....look at the pic. its clean( not sooty) mix outside on cyl...strange. would assume some combustion mix up there ...nothing leaking from intake manifold....strange.

 

[Mastermind]

There is nothing inside the boot that I could see or feel

That is the boot that needs to be replaced.

 

[Adirondackstihl]

I can't come up with any possible reason for the oil on the outside like that.
Oil usually attracts dirt and grime. Not the case here.
If I had to guess, the saw was in a Jobox or side bin with other saws that happened to leak bar oil on the 661. I see that every time Richards Tree Service pulls up with his bucket truck and opens the side bin where he keeps the saws hog piled on each other.

Change that intake boot & coil

 

[huskyboy]

@angelo c I agree, it almost looks like it was weeping from where the spark plug socket/decomp is. Loose plug? Hard to say without looking in person and by no means am I an expert. Just a rookie saw enthusiast

 

[CR888]

Stihl 066-661....30ish years. For those that are Stihl nuts and don't like the 661....don't panic, in 3 or so decades Stihl will release a new model.

 

[Brewz]

decomp and plug were tight but its possible the decomp was pushed in and leaked.

Regardless, I will contact Stihl today and find out how much for an updated coil and boot.

My guess is $200 - $300 range

Will ring them now

 

[Brewz]

Rang the local Stihl shop and they are clueless
Have no recollection of coils of intake boots being warranted or replaced.
Can only find 2 coils in their IPL's, a 1301 and 4720?
Also told me there is only 1 boot style listed.

So now I have no idea as I cant find an IPL to look at

 

[KiwiBro (deleted)]

Rang the local Stihl shop and they are clueless
Have no recollection of coils of intake boots being warranted or replaced.
Can only find 2 coils in their IPL's, a 1301 and 4720?
Also told me there is only 1 boot style listed.

So now I have no idea as I cant find an IPL to look at

I suspect dealers are much like the 661's - a mixed bag. Try contacting @bennne

or perhaps a Northern Hemisphere OPE member will help you?

 

[Brewz]

Just rang another dealer... same story.

"Na mate, never heard of any issues or updated parts?" was the answer

 

[jmssaws]

I haven't had trouble with either coil or either boot but I haven't worked on a bunch of them.
I do believe your oil was dumped out of something else on your saw or it would be covered in dust.

 

[jmssaws]

The updates were to stop them from lean seizing I believe so if it's not seized I wouldn't fix what's not broken.

I say a reset is what it needs.

 

[porsche965]

Coil and intake boots are n/c at my Dealer.

 

[Brewz]

The updates were to stop them from lean seizing I believe so if it's not seized I wouldn't fix what's not broken.

I say a reset is what it needs.

YEah true, that makes sense.
I will put it back together and work out how to reset it

 

[Adirondackstihl]

YEah true, that makes sense.
I will put it back together and work out how to reset it

Reset is simple.
Just have some wood handy