Mastermind Meets The MS660

[MustangMike]

I have a couple of questions.

1) Randy, I did not see machine marks on the piston, is it the pics, or how do you determine when to re use/replace a piston.

2) Deets, did you see any gain in performance going past 20/1000 timing advance? I think at some point it just makes it harder to start and not really stronger, but that point may be different for different saws.

And Thanks for a Great Thread!

 

[Canadian farm boy]

@MustangMike I know you asked randy but I figured I throw my $.02 in. When I built me 066 I filed my key just past .030. The saw runs great but if your not carful when starting it it will rip the pull handle right out of your hand. I eventually started braking starter cords. I ended up putting a heavier cord in and installed a D handle. I think now that I would of been better off filing .020 off the key. The saw probably would preform just as good or maybe better and would be easier to start

 

[Canadian farm boy]

Something else I recently learned from a certain friendly monkey @Mastermind was that if you open up your coil gap a little you will remove some of the timing advance and if you close up you coil gap you will advance your timing a tad bit. I'm gonna try opening the coil gap on my 066 from .010 to .015 and see what happens.

 

[Glock37]

Not a 54mm bore.........it's a 52mm bore. But, that's ok with me. I can make these saws really come alive. They don't quite make the torque that a 660 makes. But they wind up sporty as hell.

Do you use a 650 piston or a 064 piston randy if you had to replace it ?

 

[Deets066]

I have a couple of questions.

1) Randy, I did not see machine marks on the piston, it is the pics, or how do you determine when to re use/replace a piston.

2) Deets, did you see any gain in performance going past 20/1000 timing advance? I think at some point it just makes it harder to start and not really stronger, but that point may be different for different saws.

And Thanks for a Great Thread!

I've never tried it in a different spot than what it's at. I could tell a gain in how it ran so I left it where it's at.

 

[Backtroller]

I appreciate threads like this. Step by step and clear photos. Even the fact that everyone is so willing to share how they do it is awesome. I don't believe that there are too many places where professionals (or highly skilled amateurs) will openly share their tricks, numbers, etc. Glad to be part of this. Thanks guys.

 

[Canadian farm boy]

I concour. Great thread Randy.

 

[Mastermind]

1) Randy, I did not see machine marks on the piston, it is the pics, or how do you determine when to re use/replace a piston.

The piston is good. Machine marks intact. Must have been the camera angle. The bottom of the skirt on the intake side always looks a bit worn on these saws......even on new ones. lol

Do you use a 650 piston or a 064 piston randy if you had to replace it ?

Either or. Same piston.

 

[Glock37]

So doing some thing you can put a 640 or 650 top end with decomp where as the 064 does not have decomp but then what top cover do you use


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[Deererainman]

I've always enjoyed your build threads. Learned a bunch too. Thank You MM!

 

[Mastermind]

So doing some thing you can put a 640 or 650 top end with decomp where as the 064 does not have decomp but then what top cover do you use


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The bolt pattern is different between the 064 and the 650.

 

[Redfin]

Did you get the muffler finished?

 

[Mastermind]

Yes sir.

Gotta upload the pics.

 

[Sty57]

Now........y'all wondering what the final port timing numbers were?

I'm Kinda late to the party but I couldn't resist 8675309

 

[Mastermind]

 

[jmssaws]

I've messed with advancing the ignition a bunch on these saws and it seems 020 to 030 off the key puts you in the kicking zone, I've noticed gains to 050 and on a play saw that's where I put them but they do not kick, once you get passed 030 they stop kicking but keep gaining.

My 064 is advanced the width of the key, the farther I go the better it runs but at 020 it would rip your hand off. Lol

 

[Mastermind]

Interesting.....

 

[riverrat2]

for some strange reason that looks kind familiar!!!!!

Just sayin!!!!

 

[jmssaws]

Interesting.....

I've checked it many times, 020 030 will kick 040 wont.

 

[Mastermind]

You know I'll be testing more advance now Jason. Thanks for sharing your findings.