Progressive Modding of a Dolmar 7900
- Thread starter blsnelling
- Start date
Help Support Arborist Forum:
Same way as in 155 or 190?
I'm actually a bit concerned about the reading on my ported 7900, the last time I checked the compression it was well over 180. It may have been the fact I ran the saw an hour before I tested it, or it a gauge issue.:dunno: I'll test my stock when I get my gauge back.
mowoodchopper
Polar Bear
150-160 brad and looks like new inside.
This is another way to go on a 7900 muffler. Functional but doesn't look as good as Brads!
On the first pic you 'll notice that I opened up the factory port too!
IMG]http://www.arboristsite.com/attachment_29586.php[/IMG]
/http://www.arboristsite.com/attachment_29590.php
On the first pic you 'll notice that I opened up the factory port too!
IMG]http://www.arboristsite.com/attachment_29586.php[/IMG]
/http://www.arboristsite.com/attachment_29590.php
Last edited:
scotclayshooter
Addicted to ArboristSite
Err im not sure what you quoted of mine but ive never had a 6400??????
Im sure my guage is near right and yes it has a shrader valve
At 155 i would say it aint run in!
My 7900 will just stop the rope when i try to start it and pull the handle out of my hand, If i had the know how i would fit a de-comp!
mowoodchopper
Polar Bear
Something is messed up with the quote system, it did it to me earlier. I quoted Brad and something else came up. My 6400 is broken in and is about 150-160 as I said .
mowoodchopper
Polar Bear
This is another way to go on a 7900 muffler. Functional but doesn't look as good as Brads!
/http://www.arboristsite.com/attachment_29590.php
Looks good to me!!!!
Work Saw Collector
GTG Coffee Maker
Me too.
The nice thing with this method is that you can open up the cage with the hole in the front!
scotclayshooter
Addicted to ArboristSite
mowoodchopper
Polar Bear
How does she sound? I like it when they have a nice pop to them at idle.
Sounds good.........mine is modded but sounds good stock.
A few years, most you guys weren't here, a whole different crowd was here and we did the GTG thing a lot. I attended 5 in all. Anyway I decided to try my hand at warming over a 7900. I have since sold the saw but it ran nice, I eliminated the base gasket giving a squish of .022." I also cleaned up all the casting flash and worked the piston a little plus a muffler mod!
mowoodchopper
Polar Bear
I just went and checked mine for you again brad, its never been tore down but looks exc through the port, has ran klotz at 40-1 all its life and has been used 1 season and part of another, IMO its as strong as it was new and is at 152 right now.
mowoodchopper
Polar Bear
Where is Iberia?
45 min south of Jefferson City and 25 min north of Ft Leonard Wood
That isn't bad idea..........did you de-burr the inside of all the holes???
I drilled it with the saw running (chain brake on) an used a dental pick to check for large burrs. But there are probably some small ones still hanging around.
rms61moparman
Addicted to ArboristSite
Just went out and tested mine, just shy of 170.
Of course my gauge is about as junky as my saws, so I will have to test again with the one youall used sometime.
Pulled a flat 120 with the compression release pushed in. The same as my 3400! LOL
Mike
