The Dolmar 7910 - Snellerized Style

[blsnelling]

It's been 5-6 years since I last modded a Dolmar 7900. I never was quite satisfied with the results I was getting at that time. I've followed MillerModSaws threads very closely. I've talked to Randy and Poleman as well. I owe a lot of this build to them. I've taken what I learned from them and applied it to this new 7910. Thanks guys!

Here's the saw as I received it, straight from our friend FordF150.

Those of you that have followed some of the other 7910 threads will know that they have a very restrictive chamber in the muffler. This chamber actually protrudes from the muffler and inserts into the exhaust port. The muffler must be uncrimped and this chamber removed. I then cut the chamber and the protrusion from the thick metal flange they're welded to. I ground most of the grooves from the exhaust port. This meant a LOT of port matching on the thick flange of the muffler. Lots of extra work on this saw in the muffler and exhaust port!

 

[blsnelling]

I then proceeded to install a 272XP coil. No unlimited coil is available for the 7900/7910, so I chose to make the mods necessary to run this unlimited 272 coil. The stock coil is limited to 12,800, IIRC. In addition to being much harder to tune, that's just way to close to the RPMs this saw will want to turn.

The 272 coil fires at a much different time than the stock coil. For that reason, the key must be ground from the flywheel and then advanced approximately 30°. I have marked the case at 0°, 25°, 30°, and 35°. You'll notice that I've filed the one fin to a point, to make timing adjustments more accurate and easier to set.

 

[Deets066]

Nice lookin grinding there B Rad

 

[blsnelling]

There are some more mods coming for this saw. I have the HD filter kit on order. This kit is only available in gloss black and wouldn't look that good with the flat black cylinder cover. So, some asthetic mods are going to be done to this saw as well. You'll just have to wait to see what that's all about

 

[Ironworker]

Nice, I got nuttin doing tonite so keep it coming or I'll have to go on Facebook and post my Athiest/anti-religion stuff.

 

[Stihl 041S]

Nice work Ol Buddy.

 

[blsnelling]

Nice, I got nuttin doing tonite so keep it coming or I'll have to go on Facebook and post my Athiest/anti-religion stuff.

Lol. That's all I've got for now. I will tell you this, I saw 15,100 while playing with the tune

 

[Ironworker]

Lol. That's all I've got for now. I will tell you this, I saw 15,100 while playing with the tune

Good stuff.

 

[stihlaficionado]

There are some more mods coming for this saw. I have the HD filter kit on order. This kit is only available in gloss black and wouldn't look that good with the flat black cylinder cover. So, some asthetic mods are going to be done to this saw as well. You'll just have to wait to see what that's all about

You going to etch your name on the cylinder fins?

 

[blsnelling]

You going to etch your name on the cylinder fins?

Good idea

 

[stihlaficionado]

Good idea

I'd do each letter in a different color

 

[redfin]

Looks good Brad. Lots of Dolmar poppin up around here lately.

 

[blsnelling]

Looks good Brad. Lots of Dolmar poppin up around here lately.

We've got a couple good dealers on the forum now. That makes a real difference.

 

[nnero]

Oooo this is exciting. I'm liking all the Dolmar stuff going on lately. Those spikes are huge!! Great job, can't wait to see more (and the Solo twin)!

 

[Babaganoosh]

Oddly enough I just got to really run my dolmar/makita 6421 today. I was very pleased. Probably do the 79cc upsize over the winter.

 

[Adirondackstihl]

The 7900 at the bottom with the 20" Cannon is my PTM7900. The AF cover was brandy new gloss. The top cover was nasty stained faded red. Few coats of Fusion gloss black and she matched the AF cover real nice.
I have one more saw in the pic, can you find it?

 

[MillerModSaws]

I know your not particularly found of these saws. Has that changed any?

 

[Poleman]

Good job Brad!!!!! Don't the r's make you grin compared to stock???
You really spent some time on the exhaust.....looks GREAT!!!

 

[CR888]

That trailer of saws shows how long term cad can be managed. lts not the point that there is more saws than logs of wood to cut.

 

[Adirondackstihl]

That trailer of saws shows how long term cad can be managed. lts not the point that there is more saws than logs of wood to cut.

There was/is still plenty of wood there to cut!