MS660...which muffler?

A little help is needed,

I would like to know which muffler housing for the 066/MS660 has the large outlet. Not the cover, but the actual case that bolts to the cylinder.

Thanks in advance,

John

Tzed250 said:

A little help is needed,

I would like to know which muffler housing for the 066/MS660 has the large outlet. Not the cover, but the actual case that bolts to the cylinder.

Thanks in advance,

John

Click to expand...

It will be a pre EPA Crunch 066,,,, Andy will probably know the specific year and the real reason like OSHA interference,,,, therabouts but,,, I dont think they are stihl manufactured for the US Buyer Market... so unless you find a NOS you will have to find one on an older Saw... I have a couple but they are pretty Rough,,,,

So the old housing is NLA? Rats, sounds like it's time to cut metal. I would still like a part# if anyone comes up with it...

Tzed250 said:

So the old housing is NLA? Rats, sounds like it's time to cut metal. I would still like a part# if anyone comes up with it...

Click to expand...

Remove the screen and make your own bigger then put the screen back in. It is cake.

Yes, a die grinder with a carbide bit is your friend.

I would love to see an entire history of the 066/MS660 mufflers including what mods can be made to what muffler component. Simple huh?

Man, upon reading my post I definately qualify as a chainsaw geek.

RiverRat2 said:

It will be a pre EPA Crunch 066,,,, Andy will probably know the specific year therabouts but,,, I dint think they are stihl manufactured for the US Buyer Market... so unless you find a NOS you will have to find one on an older Saw... I have a couple but they are pretty Rough,,,,

Click to expand...

I maybe wrong, but Lake may need to flog ya.......I think OSHA not
EPA,..........to loud.

Don't matter it has a smaller hole now. :censored:

yes it is very easy!!!!

Tree Sling'r said:

Remove the screen and make your own bigger then put the screen back in. It is cake.

Click to expand...

Just like Jasha said,,,,

if you want the exact size I can measure one of mine on one of my early model 066's

I think Andy said that the early ones were 5/8, and the modern ones are 3/8". I will be getting the dual port front cover, but I wanted to know if I could get the big port case to go along with it.

Trigger-Time said:

I maybe wrong, but Lake may need to flog ya.......I think OSHA not
EPA,..........to loud.

Don't matter it has a smaller hole now. :censored:

Click to expand...

Yeah trigger I think yer probably right,,,, I'm certain there's a flogging en-route,,,, LOL!!!!!

but the EPA squeezing them on emissions compliance also has had a say in the current design and subsequent minuscule exhaust diffuser!!!!

Tzed250 said:

I think Andy said that the early ones were 5/8, and the modern ones are 3/8". I will be getting the dual port front cover, but I wanted to know if I could get the big port case to go along with it.

Click to expand...

Yep I just measured mine and its defintily larger than .5"

I measured all these holes a year or two back... posted them in some old thread...

Let's not forget they do put out the rated HP with the pea sized hole

So...leave the box in front of the port alone...or open it up a bit?

Tzed250 said:

So...leave the box in front of the port alone...or open it up a bit?

Click to expand...

If you are not modding the saw and are just installing the dual port front cover,,,, Im thinking it really isnt necessary,,,, but if you decide to,,, you can certainly tune to it,,,,,,

Well, I'd still like to see a part #, but thanks for the input guys. I think I will go at this in stages. DP cover, then larger round port, then the baffle box if I need to.

I have the older DP muffler. It has the 5/8's hole. It's a bit rusty and this is the only thing stamped on it.
Stihl
1128/08
RKP
Hope that helps

gregz said:

I have the older DP muffler. It has the 5/8's hole. It's a bit rusty and this is the only thing stamped on it.
Stihl
1128/08
RKP
Hope that helps

Click to expand...

I have one from one of my old half wrap 066's and its @ is 1122/09-1 and it has a 5/8 hole!!!!!!! it was a bit rusty as well!!!!! I had to bead blast it in order to read the numbers!!!!! LOL!!!!!!

From that info, and the 066 IPL that I have, it would seem that the 1122 140 0609 is the part for the muffler assy. with the 5/8 hole. Is this part NLA? Thanks for bringing this up again RR and gregz...

P.S.

This might be the post Andy was talking about:

http://www.arboristsite.com/showpost.php?p=345886&postcount=17

That's the post...