Mastermind worksaw's picture thread
- Thread starter Trx250r180
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Nate66n1
Addicted to ArboristSite
Those there have to be my favorite big cc saw, I have two and the last one that I got hauls ass.
HuskStihl
Chairin'em for the sound
I have never been, and hope to never be inside the mooberized 394
TBrown
more saws than I need
Would that be the one I sent you? Did you look at the jug when you had it apart?
Nate66n1
Addicted to ArboristSite
Yep it is, the jug was in really good shape. I put a new mako piston in it and opened up the intake,exhaust,lower transfers,deleted the base gasket, and added another port on the muffler. It gets with it pretty good. I just need to look into making it unlimited rpms. Damn thing is bouncing off the limiter unless you have it dogged in or really laying on it.
TBrown
more saws than I need
If that coil is limited to the same rpm as my 880 then my 880 needs the same treatment, soon.
Mastermind
Work Saw Specialist
I was thinking the 084 coil was unlimited.......am I wrong about that?
Basically the same as a Dolmar 7900, from what I understand. I'll be sending mine soon.
Mastermind
Work Saw Specialist
Yes I've done a couple of them. Tough to get proper gains from them if you don't know what you are doing.
Basically the same as a Dolmar 7900, from what I understand. I'll be sending mine soon.
The 681 has a 1mm longer stroke.....
I had 4 084 runners. 3 ported total all by different folks. 2 woods ported, 1 on pipe race ported on gas. Overlook the 2 166. Both ported too, 1 woods 1 race.
Had a couple 3120 too. 1 race ported, 1 stock porting with some mods.6 saws ported all by different folks right there alone, no stickers needed.
My fav for work was the 084's too.
Well, besides that! I believe the P&C are the same? So the 681 should be a slightly stronger saw?
Mastermind
Work Saw Specialist
Yeah........bad dudes even stock.
Lots of crankshaft issues though.
Lots of crankshaft issues though.
I think I remember 3 different coils and 5 different carb combo's on those. Cant remember a coil being limited but do know a few of the carbs were. Check and make sure as my memory is not all there anymore.
Some dude named Cut4fun posted this in another forum a while back...Put a 681 cylinder on a 7900 and see what happens.
"Here is some info that was passed on by a Solo, Dolmar, Redmax dealer when the 681 first arrived.
I have found in my own experience that it is difficult to find a local dealer for Solo and that the online parts ordering doesn't seem to work for the 681. This was when the 681 was first released...
The new Solo 681 is now here, 81cc (80.7) same basic weight as the 7900 but with some major improvements.
The 681 has a larger air filter then the 7900, that is why the air filter cover is shaped a little different.
681 also has the good Walbro carburetor not the typical cheap Zama from China like the Dolmar.
681 has the side chain tensioner in the case like a Stihl not in the side cover like Dolmar.
681 also has a large top AV spring. The Dolmar had problems with them breaking.
681 also has a better bracket set up on the AV mount to the top handle. 681 bracket is bolted to the top cover. The Dolmar has a strap that wraps around the handle and it is always turning and putting stress on the top av spring.
681 has a two year YES TWO YEAR commercial warranty.
Parts for the Dolmar are a problem, you have to find a dealer.
Parts for a Solo can be ordered online from Solo at the same price they cost from the dealer.
At first you will think that it is built by Dolmar. That is not the case. This saw is built by Solo. Solo does sell the large Dolmar 9010, they call it the 694 but the 681 and its smaller sisters 675, 665 are Solo built.
From what I understand is that Dolmar did not design all of the 7900. Solo designed a lot of the parts for that saw. They were to be sold together in joint venture like the large Dolmar 9010.
Dolmar took all of the credit for the 7900 and Solo got the shaft.
Solo took it one step farther and made the same basic saw with a larger engine and a few improvements.
OK I have had a lot of questions about installing the 681 parts on the 7900 to make it 81cc.
Both of the above saws have the same bore size of 52mm. The 681 jug will bolt right on the 7900 case the muffler and carb boot will line right up but the jug is taller to accommodate the longer stroke so you will loose compression with the 7900 crank. I am sure that you can put the 681 crank in the 7900 case. That is a lot of work and with the cost of the crank and labor its not economically feasible."
Mastermind
Work Saw Specialist
Never heard of nobody named Cut4fun.......
That Solo Dolmar info came straight from Dozerdan and his website when it was up.
Now like I said, go put a 681 on a 7900 and try it out with the large squish etc etc.
Now like I said, go put a 681 on a 7900 and try it out with the large squish etc etc.
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