670 Jonsered power build. Need input please

[Kozak Logging]

Don't grind inside the bore.
Use stock jug and piston.

I don't have a problem taking the jug to a machine shop. Do you guys have them just mill of the top of the head and thats it? How much do they usually take off?

 

[Adirondackstihl]

check squish to see if it can be run gasketless.

This was my next suggestion.

But be sure to use a good sealant on the bare case/cylinder.
Only a few products I'd recommend and a lot of guys will stand behind me on this...
Loctite 518 / Permatex 51813
Yamabond 4 / Threebond 1194

 

[Adirondackstihl]

I don't have a problem taking the jug to a machine shop. Do you guys have them just mill of the top of the head and thats it? How much do they usually take off?

You need to check out a saw build thread by @Mastermind

 

[Adirondackstihl]

Here.....
Read this Craig


http://opeforum.com/threads/mastermind-meets-the-ms660.244/

 

[mdavlee]

I've used Motoseal and regular ole black rtv. It held up for 2 or 3 years on one saw. I replaced it with motoseal when I had the saw apart.

 

[Adirondackstihl]

I've used Motoseal and regular ole black rtv. It held up for 2 or 3 years on one saw. I replaced it with motoseal when I had the saw apart.

*facepalm*
Don't say the fricken RTV word

Hiyah there Mike!!
I gotta get you a chain sir

 

[mdavlee]

*facepalm*
Don't say the fricken RTV word

Hiyah there Mike!!
I gotta get you a chain sir

It works when you don't have anything else as long as the surfaces are clean.

Yes you do. I'll be running out of free time soon.

 

[Adirondackstihl]

It works when you don't have anything else as long as the surfaces are clean.

Yes you do. I'll be running out of free time soon.

I have a 60dl NIB STIHL square ground chain here, but they be some hard azz toofs

 

[mdavlee]

I'll take it to run as work chain. I happen to have a few 60 dl in CL and LGX

 

[Kozak Logging]

I read most of it, way beyond me and I'm not afraid to say so haha. I messaged mastermind and asked how much for him to build it if he would. I am kind of thinking of doing the whole saw restoration as far as top cover goes as i think mine has a crack in it.

 

[Adirondackstihl]

I'll take it to run as work chain. I happen to have a few 60 dl in CL and LGX

Trade my new one for a filed Oregon and some $$?
Works for me.
I did some mailing today.
I can head out in the AM and send you this one.
I think I have your addy

 

[Adirondackstihl]

I read most of it, way beyond me and I'm not afraid to say so haha. I messaged mastermind and asked how much for him to build it if he would. I am kind of thinking of doing the whole saw restoration as far as top cover goes as i think mine has a crack in it.

Told ya there's a lot more to it!

 

[mdavlee]

Trade my new one for a filed Oregon and some $$?
Works for me.
I did some mailing today.
I can head out in the AM and send you this one.
I think I have your addy

Sure.

 

[Kozak Logging]

How much can i have milled off the bottom of the top of the cylinder head so i can get more compression? I have done that on my 2 stroke older 80's dirtbikes with a great turn out. Will that work on a saw?

 

[Adirondackstihl]

How much can i have milled off the bottom of the top of the cylinder head so i can get more compression? I have done that on my 2 stroke older 80's dirtbikes with a great turn out. Will that work on a saw?

No
Your bike cylinder has a removable head. A saw cylinder is one piece.
See page 2 of the above referenced thread

First thing you need to do is measure squish.

 

[Kozak Logging]

So the squish ring just sinks into the gasket further thus bringing the cylinder down closer to the case?

 

[Adirondackstihl]

So the squish ring just sinks into the gasket further thus bringing the cylinder down closer to the case?

No
The squish band is at the top around the perimeter of the combustion chamber.
If you pull the gasket without measuring the clearance, he piston could slap the combustion chamber if you don't have sufficient clearance.
In your case, I wouldn't shoot for anything less than 0.018"

 

[Adirondackstihl]

Measure squish.
Measure base gasket thickness.

Subtract gasket thickness from squish measurement.

Example:
Squish measures 0.039"
Gasket measures 0.020"

Removing the gasket you'd be left with 0.019" clearance. This is an acceptable amount of clearance.

Any less than 0.017" and Id be looking to have machine work done. Any more than 0.025"....machine work.
Again, these are just my parameters that's I've collected thoughout my years as a forum member.

To get a good grasp on everything and before you start tearing into your saw, I think you should hang out for a while and read some more......ask more questions. Take part in a few more threads.
Good bunch of guys here, some have forgotten more than I'll ever learn.

 

[Kozak Logging]

I read a thread about doing a Husqvarna 272 piston/cylinder/carb swap. Will this end up being better than just milling?

 

[WKEND LUMBERJAK]

Guys I think this guy is trolling