6400/7910 build

[t4driller]

I got a nice 6400 awhile ago and bought a new 7910 pc. Finally got sone time to get around to building it and thought I would share what all I done to it.

I sent the cylinder out to rattler to get the base and band cut. Then ported it and muffler mod. My starting numbers were 106, 135/138, 77. I ended up at 98.5, 126/128, 80.5. Exhaust and trans got raised and widened, intake was just widened. The primary uppers I didn't take toward the intake because if where the ring pin is. The secondaries got widened toward the exhaust. For the lowers I just nipped the corners a little bit.

For the muffler, I heated up the crimp and and uncrimped it. I used a map gas torch and it only took about 10 minutes to do. I removed the baffle inside and matched the opening to the exhaust. The 6400 port is a good bit smaller then the 7910. So it needed opened up quite a bit. Also used a 660 exhaust gasket, it was almost a perfect fit. I then added another port to the fw side with a 288 style deflector.

So far I only tested it quick in some small stuff I had at the house. I'll try and find some bigger wood to get a video of it running. Here s some pics of what all was done.

 

[t4driller]

More pics

 

[t4driller]

More pics

 

[Armbru84]

Looks good. Carl Miller hooked me up with a conversion kit for my 6400 as well. Interested to see what you think of it in bigger wood.

 

[TreeLife]

I miss mine...

 

[t4driller]

I miss mine...

I had a 7900 and 7910. Whenever this 6400 came up for sale I had to have it. I missed my other ones.

 

[Miller Mod Saws]

She looks good. That saw is clean!

 

[t4driller]

She looks good. That saw is clean!

Ths nk you carl!! Those numbers actually came from you a year or 2 ago whenever I built my first 7910. It pulled a 32 no problem.

 

[CapitaineHaddoc]

Great job dude! I did the same on my 7900's muffler, and I was surprised to see how easy it was. This makes the Hack job JMS did on Sondre's 7900 even more scandalous.

Looks good. Carl Miller hooked me up with a conversion kit for my 6400 as well. Interested to see what you think of it in bigger wood.

Ported I suppose? Don't think twice, I love the 7900 he built me.

 

[Backtroller]

Very nice looking. Clean saw and port work. Looking forward to seeing it run.

 

[t4driller]

Great job dude! I did the same on my 7900's muffler, and I was surprised to see how easy it was. This makes the Hack job JMS did on Sondre's 7900 even more scandalous.



Ported I suppose? Don't think twice, I love the 7900 he built me.

Lol, the muffler really wasn't all that hard. Surely a guy that ported saws everyday for 24.87609 years could figure it out....

 

[huskyboy]

Lol, the muffler really wasn't all that hard. Surely a guy that ported saws everyday for 24.87609 years could figure it out....

I'll sell you a professionally ported 100$ weedwacker with a unicorn cylinder on it for 350$, a steal. It cuts like there is no string on it. I'll fix it for free if it ever breaks. I do this all day every day for last 20 years and I was a pro logger, don't listen to the fools on ope they are liars out to get me.

 

[Wilhelm]

Ths nk you carl!! Those numbers actually came from you a year or 2 ago whenever I built my first 7910. It pulled a 32 no problem.

Other than mild muffler mod, stock PS-7900 with 36" 3\8" B&C BURIED in oak noodling - a thing of beauty and sheer power, didn't miss a beat!

Great job dude! I did the same on my 7900's muffler, and I was surprised to see how easy it was. This makes the Hack job JMS did on Sondre's 7900 even more scandalous.
Ported I suppose? Don't think twice, I love the 7900 he built me.

PS-6400 & PS-7900 muffler's can easily be uncrimped cold.
I opened and closed my PS-7900 muffler without heat.
Granted, I only modded one of these muffler's, but they are easy enough to work on.

 

[t4driller]

The first one I did I didn't use heat. It came apart but not as nice as this one did. Just makes the process a little easier I think.

I have pics somewhere of the 7900 I had with a 36 on it cutting up a 56 inch oak tree. I actually preferred running the dolly instead of the 660 I had with me also. Both were just mufgler modded.

 

[Backtroller]

I like using heat too. I was trying not to rip or crack the stainless

 

[chipper1]

Both were just mufgler modded.

I gots to get mes one of them.

 

[Simondo]

More pics

What you got planed about the De Comp location change ?

 

[t4driller]

What you got planed about the De Comp location change ?

Decomp is plugged. I'm going to put a black plug in the top cover to make it look nicer.

 

[t4driller]

I gots to get mes one of them.

Why yes, yes you do Brett.

 

[chipper1]

Why yes, yes you do Brett.

Called our dealer and he couldn't find one on the IPL, is it on the one for the 6400 or the 7910.