Stroking a Dolmar 7900

[tickbitintn]

Cottonwood is much softer than ash. Grows like a weed around here. Smaller stuff cuts fast, larger wood loads up the chain and can bind. Very stringy. Weighs a ton wet but dries up light like a sponge.

You can say all that again!
Cut up a very large one for my brother a couple summers ago. As in 36" bar from one side which left about half the bar from the other side.
It had been down a while and whittled up everything that was up off the ground pretty quickly with a 550. When it came time for the bigger pieces that were in contact with the squishy low lying ground, not so quick
Had to block up the trunk sections to be able to move it. Soggy and weighed a metric chit ton. 394 noodling clogged up real fast.
No fun!

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[mettee]

Any rpm difference in the cut with the unlimited coil? Not sure if you took a tac reading or not, but it sounded faster.

 

[Deets066]

Any rpm difference in the cut with the unlimited coil? Not sure if you took a tac reading or not, but it sounded faster.

It’s hard to accurately measure rpm in the cut. I don’t waste my time with it. Stopwatch is about all that matters

 

[Fruecrue]

I haven’t put a tac on it at all.

 

[mettee]

Well it's faster I can hear it

 

[Time's Standing Stihl]

Stock carb still?

 

[00wyk]

That is the sound I am used to from mine!
Deep low grunt, not a high pitched scream.

Is cotton wood much softer than ash?
From the videos I'd say yes, but I am not familiar to those two wood species.

I will have some play time with my Dolmar's in large beech, just waiting for the acquaintance to give me a call.

We would call it poplar here in Europe. And it is remarkably similar to the black cottonwood I've cut in Oregon and Washington.

 

[Fruecrue]

Stock carb still?

Nope.
There’s some voodoo in there.

 

[mettee]

Did you see this ?

 

[Fruecrue]

Did you see this ?

The competition?
Yup, I seens it.
Dude beats me every year. Lol.

 

[mettee]

Yours will be there, just need the porting and compression.

And to spend about a week dog boning a chain and shrinking the teeth and rakers. Or like he does build one, one tooth at a time out of 325 link to 3/8 cutters. Or something of the sort

 

[Time's Standing Stihl]

Did you see this ?

Lol'z

 

[Terry Syd]

out of 325 link to 3/8 cutters. Or something of the sort

Not so sure about that combination, but racers in Oz have used .325NK chassis with regular square .325 cutters. The chassis is just as strong and you don't have to do any 'dog boning' or thinning of rivets.

 

[Fruecrue]

Lol'z

That Clint Davis guy....

 

[Redfin]

Lol'z

Nice saw Dood.

 

[mettee]

Not so sure about that combination, but racers in Oz have used .325NK chassis with regular square .325 cutters. The chassis is just as strong and you don't have to do any 'dog boning' or thinning of rivets.

Yeah I'm not sure of the actual combo but he mentioned something about building one from scratch link by link with 325

 

[mettee]

That Clint Davis guy....

Is Clint on here? I'm not sure of everyone's name yet.

 

[mettee]

Lol'z

Are you Clint?

 

[Fruecrue]

Are you Clint?

Ding ding ding

 

[Fruecrue]

Now we know what saw Clint will be running, but more importantly, what chain will Clint be running?