Porting My MS660

[BloodOnTheIce]

Is it just me or does that look like a crack starting on the wrist pin hole?

That's a scratch from where the dremel slipped, because I thought the same thing looking at it.

 

[parrisw]

I use a saw file after the rasp on the exhaust, followed by medium sanding 1/4in drum, then fine drums then emerycloth in a high speed drill. Nice an shiney.
Knock off the hard stuff and use a rasp, you are in control - not a high speed tool with an aggressive bit.
If my ports don't look good then the saw sucks, just my own anal ways.

What grit emery cloth do you use?

 

[BloodOnTheIce]

Well it's been a busy couple days on this project.

-I cleaned up the awful looking intake w/ a small diameter round wood rasp,
it works very well and making a nice wall of the port.

-Beveled the lip of the intake, which given the angle which the intake meets the cylinder wall is a real pain.

-Measured the squish, it was .029 knocked it down to .022 using Slingers piece of glass from a picture frame and round adhesive rotary sanding disc. And kept the factory gasket which for longevity I feel better using.

- I had to helicoil the plug hole, since the thread were trashed and I neglected to check before doing all the work to the cylinder

- I gutted the muffler as well as I could, and drilled 3 3/8" hole in the cover.
This was a beat up cover I had laying around, I'll probably re-do this portion at another point.

-I didn't replace the rings, I probably should have since the saw was owned by a logging company and go only know how many hours are on it.

-Re-assembled the saw and got it running.

-The saw is running Low End 1 1/4 turns out, and 2,700 rpms, and high end 12,800 rpms and 3/4 turn out. It's still getting the excessive amount oil I used to assemble it burn off and will need some further adjustment.

- I only had a chance to make a couple cuts with but it feels "stronger" as it I know I could lean on it with all my weight in the cut and it would bog down.

Here's a couple pictures of it finished, I call it "Rat Saw" since it's so damn beat up and ugly looking.

A short video of it running, I'll get some tomorrow of it cutting.
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[wigglesworth]

Beat up and ugly lookin???? You should see my 460. She looks ROUGH compared to that one. Well, paint wise anyway. Some plastic wouldnt hurt ya though. That glass trick works out good huh?

 

[Brownpot Deaton]

glad to hear...where's the dawgs???? and is that a really nice 2100 i see!?!? love those saws...just mean...

so she turns 12,800....have to see what she does when you get her dialed in...

so is it a decent improvement in power thus far, or ok improvement???

 

[BloodOnTheIce]

I have the high end set at 3/4 turn out and that's 12,800 I don't dare go leaner.

 

[smokinj]

Nice job! Maybe port that muffler with one port at 1-1.1/4

 

[blsnelling]

I have the high end set at 3/4 turn out and that's 12,800 I don't dare go leaner.

It doesn't hurt a thing to go in more than that. A ported 660 will turn closer to 14K. Tune it where it's barely 4-stroking at WOT and forget about where the needle is. What you're experiencing here is not at all uncommon. Matter of fact there's another thread about a 394/395 with the same situation.

 

[smokinj]

It doesn't hurt a thing to go in more than that. A ported 660 will turn closer to 14K. Tune it where it's barely 4-stroking at WOT and forget about where the needle is. What you're experiencing here is not at all uncommon. Matter of fact there's another thread about a 394/395 with the same situation.

+1 on the 14k tune it by ear and it will come in at 13800 to 14200

 

[BloodOnTheIce]

Here's a couple video of it cutting today
I have it running at 13,800rpms, could bump it up a couple more.
Wood is 11.5 inch Pine
I'm not pushing the saw, it will even faster when I get a better feel for it.
This thing is an Animal! I timed it out at a little over 2 seconds a cut.

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[wigglesworth]

me likey!!! Sounds much better. Good work.

 

[blsnelling]

Now we're talkin'! Good job!

 

[BloodOnTheIce]

Thanks guys for all the advice and help. Now I just need to find some bigger wood to see what it can really do.

 

[parrisw]

Here's a couple video of it cutting today
I have it running at 13,800rpms, could bump it up a couple more.
Wood is 11.5 inch Pine
I'm not pushing the saw, it will even faster when I get a better feel for it.
This thing is an Animal! I timed it out at a little over 2 seconds a cut.

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Nice,

what chain are you running?

 

[BloodOnTheIce]

Nice,

what chain are you running?

72 CL Oregon Square ground, that's been made to go fast.

 

[troutfisher]

Looks and sounds good! The second video looks real nice, the saw stays nice and flat and the rpm's don't wander much.......sounds like you found the sweet spot and kept it there

 

[Happyjack]

Nice job Blood. You sure that wood is not rotten?

That saw is a screamer! Lets see some more vids in a nice big piece of Oak.

 

[BloodOnTheIce]

Looks and sounds good! The second video looks real nice, the saw stays nice and flat and the rpm's don't wander much.......sounds like you found the sweet spot and kept it there

I can't wait to see how it does in some 8x8's. The wood is only pine but it's solid. I've got a 25" bar that I want to see how it runs buried in some hardwood.

 

[troutfisher]

I can't wait to see how it does in some 8x8's

Should do real good, what are you running for a sprocket?

 

[BloodOnTheIce]

Should do real good, what are you running for a sprocket?

8 pin, and it's a tight squeeze getting the bar and chain all to fit with that. And I doubt there's enough time to get a 9 or 10 pin from Madsen's in time for the 4th.