parrisw
Tree Freak
That new saw sounds really good.
PS-7900 vs PS-7910
- Thread starter cuttinscott
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spike60
Addicted to ArboristSite
Sounds like this new 7910 might be a good excuse for another GTG up at The Cutting Edge, eh?
166
Addicted to ArboristSite
Have you tried out the demo 7910 that Bob has?
spike60
Addicted to ArboristSite
Not yet. Haven't seen him since he got it. He's happy with though. Good power right out of the box, and compared well with a broken in 7900. A little time on the 7910 and I'd say they'll be neck and neck.
I like how Dolmar came up with an innovative solution to make a great chassis compliant, rather than have to do a clean sheet strato design. Is there a chance that they could use this controlled bleed muffler idea to replace the cat on saws like the 5105? The heat from those things is not good for any saw.
166
Addicted to ArboristSite
They came out with the SLR cylinder/muffler on the cut off saws first. I'm sure they are working on this design on other models. But they do have strato model chainsaws in the works. It is nice to share the majority of parts with the 7900. Especially on a saw that gets beat up and crashed a lot.
We have had Zero issues with the cat mufflers on the 350/351/420/421/510/5105/6400/7335 (Cut Off) other than burning off the foil insulation on the cylinder cover.
166
Addicted to ArboristSite
Maybe a mini GTG at Boonville?
Opening the muffler
So what would opening up the muffler do? Or replacing it with an earlier 7900 muffler? I guess it would need to be richened on the jets.
Has anyone done this? I guess its basically the same as the original 7900?
Thanks Dave.
So what would opening up the muffler do? Or replacing it with an earlier 7900 muffler? I guess it would need to be richened on the jets.
Has anyone done this? I guess its basically the same as the original 7900?
Thanks Dave.
Last edited:
Hedgerow
HACK
That sir, is a good question...
I'm hoping to find out some info in a couple weeks...
I have a customers saw here that wants the extra muffler port, so I want to find out if I would be upsetting anything by messing with the new system.
Dave
Hedgerow
HACK
You got a test log? If so, run it through... Give it an extra port, and compare... Then let us know... Worst case scenario, you gotta order another muffler...
Best case, it improves performance...
Something tells me there's not much to be gained there... But I could be wrong...
I will try that, I happen to have dual port 7900 muffler here right now, so I will just swap it out and see, Dave
Hedgerow
HACK
Please let us know.... I hope I'm wrong about my theory... Since I would like a new 7910. The existing 7900 will be going under the grinder soon...
Hedgerow
HACK
That The engineers at Dolmar have figured out how to make a small expansion chamber inside the muffler of their saw... Reducing emissions while not hindering performance of the saw...
If so, you'll get a net gain of zero... Possibly a decrease in performance...
Dolmar 7910 Carb
So I went to look at the 7910's new carb before I put the 7900 dual port muffler on to test. I see the highspeed is not adjustable with a screwdriver. I call up Dolmar and ask for the special tool needed to richen the carb and they tell me that we are not allowed by epa to have them.......
So I went to look at the 7910's new carb before I put the 7900 dual port muffler on to test. I see the highspeed is not adjustable with a screwdriver. I call up Dolmar and ask for the special tool needed to richen the carb and they tell me that we are not allowed by epa to have them.......
You should be able to get the tool from a dealer.
I AM a dealer....lol. This is what my distributer just told me.
Hedgerow
HACK
These?
carb adjusting tools | eBay
carb adjusting tools | eBay
