Solo 665/Dolmar 7910

[Miller Mod Saws]

Yes with the same timing curve.

Have you tried putting the 7900 coil on the 7910?

 

[mdavlee]

Have you tried putting the 7900 coil on the 7910?

Nope. Not had an actual 7910 to hack up

 

[MustangMike]

Randy, that saw is Beasty!!!! Congrats!!!

And that piece of wood looked tough. How many cubes is that thing?

 

[jake wells]

got more cubes than a ice tray.

 

[jacob j.]

I've tried them with an unlimited coil.......they seem stronger with the OE coil to me. Still tweaking stuff though.

 

[drf256]

That saw's really singing Randy. Great job again.

Who's the skinny guy makin the cuts?

 

[paragonbuilder]

Wow!! I think I'm going to need to get a 7900 top end for my 6400 now......


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[Miller Mod Saws]

Randy, that saw is Beasty!!!! Congrats!!!

And that piece of wood looked tough. How many cubes is that thing?

81cc of pure fun!

 

[Mastermind]

Randy, that saw is Beasty!!!! Congrats!!!

And that piece of wood looked tough. How many cubes is that thing?

81cc of pure fun!

Exactly.

 

[Miller Mod Saws]

Exactly.

Morning buddy!

 

[MustangMike]

Wow, I'm impressed, was fully expecting you to say in the 90s, or even over 100.

So what makes this hybrid so unique? Does it change crank capacity?

 

[riverrat2]

I finally felt well enough to make a video of one of these old Solos. That said......I had to send Dave's 064 back untested. I couldn't start it.

This is two of only three cuts this saw has made. Seems pretty sporty.

Sha-Zammmm!!!!!!! er uhhhhhmmmm Yeah! Sporty to say the least!!!!!

 

[Keith Gandy]

Sha-Zammmm!!!!!!! er uhhhhhmmmm Yeah! Sporty to say the least!!!!!

Yes!! That saw sounds healthy!!

 

[Mastermind]

Wow, I'm impressed, was fully expecting you to say in the 90s, or even over 100.

So what makes this hybrid so unique? Does it change crank capacity?

Not like you might think. Of course it will be larger than it was as a 665, but barely more than a 7910.

The 7910 jug just works better on this chassis than the 681 jug....at least for me.

Sha-Zammmm!!!!!!! er uhhhhhmmmm Yeah! Sporty to say the least!!!!!

That's your saw there in the video Rick.......and it's on it's way to Texas.

Now......to make the unlimited saws as stout.

 

[Zombiechopper]

wow, that thing has BALLS. And with 95* exhaust???

What's the compression Randy? Why does it run so good with that high exhaust?

 

[Mastermind]

I've not checked the compression........my gauge says everything is blowing about 200psi. I don't trust it much these days.

I'll share my theory. Remember......it's just a idea of mine.

From the squish band down to the roof on the exhaust port is about 25mm. I see this a lot in really strong saws.

If you set this saw up at 102° or so it's way lower than that. So, I started thinking that the "power stroke" was actually too long in this case. So......I started at 98° then 97°......then 96°. I also raised the transfers as I went up. Now.....the intake floor is at 81°. That's a little too low on many saws.......but this saw has a really tight case. So......with a 81° intake, I felt like I could take all the other numbers higher to match it. Does this make any sense?

 

[Deets066]

Why do you like the 7910 jugs better than the 681 jugs?

Factory port timing?
Or transfer size?

 

[Mastermind]

I can cut the squish......not cut the base at all. The transfers are close after machine work......exhaust flange outlet is huge.

 

[Deets066]

Yeah, the less grinding on the transfers on any saw is a plus

 

[Miller Mod Saws]

I can cut the squish......not cut the base at all. The transfers are close after machine work......exhaust flange outlet is huge.

Mind if post up some numbers with ya?