Dolmar 64xx/73xx/79xx series, smurfs and solo 665/675/681 thread

[PA Dan]

@PA Dan
In case it helps having the factory spec.....

View attachment 199709

Thanks! As Drew mentioned yesterday I am running a Walbro HD12 right now. I have the Zama but am not finished with the mods I wanted to do on it. Should be finished within a week and I try it on the saw.

 

[huskihl]

Thanks my friend! I will try and correct as this saw will get a good bit of run time in the coming weeks!

The tune actually sounds fine to me. Hair bit rich on the high side maybe. What I've noticed after they get shut off is that the needle leaks. I'm guessing maybe a longer spring, or some shims. The tank vents are supposed to build pressure , but the needle and seat are supposed to hold it also

 

[PA Dan]

The tune actually sounds fine to me. Hair bit rich on the high side maybe. What I've noticed after they get shut off is that the needle leaks. I'm guessing maybe a longer spring, or some shims. The tank vents are supposed to build pressure , but the needle and seat are supposed to hold it also

Thanks Kevin! What about it taking a while to come back down to idle?

 

[huskihl]

Thanks Kevin! What about it taking a while to come back down to idle?

Normal. If it returns to idle slowly after a long cut, it would be the high side that was too lean during the cut, causing the heat. Yours was 4 stroking as soon as the log got smaller, so it wasn't that.

I just saw above where you said you were running the walbro. I'd scratch my explanation of what I thought was happening with the needle. That I know of, that problem was only on the Zama

 

[chipper1]

The tune actually sounds fine to me. Hair bit rich on the high side maybe.

Sound familiar Dan lol.

 

[PA Dan]

Sound familiar Dan lol.

The general consensus...

 

[mettee]

Go to bed

 

[huskyboy]

I’m about 1 3/4- 2 turns out on my ported 7900 I think depending on outside temperature. Too fat or too lean kills power. I tune any saw where they want to run, maybe a touch fat for long cuts with a big bar.

 

[PA Dan]

I’m about 1 3/4- 2 turns out on my ported 7900 I think depending on outside temperature. Too fat or too lean kills power. I tune any saw where they want to run, maybe a touch fat for long cuts with a big bar.

I assume the Zama carb and is it stock or modded?

 

[huskyboy]

I assume the Zama carb and is it stock or modded?

Yessir and I think I just thinned shafts on it if I remember right.

 

[PA Dan]

Yessir and I think I just thinned shafts on it if I remember right.

Explain your thinning shafts? Got any pics?

 

[mettee]

He made dem shafts skinny so the air doesn't hit them and goes right on by

 

[mettee]

 

[PA Dan]

View attachment 199871

I see! I can probably mess that up while I'm at it!

 

[huskyboy]

View attachment 199871

Eggzackly

 

[dustinwilt68]

Little much for a work saw though imo.

 

[Mastermind]

Chainsaws are loud and scary.

Just sayin.

 

[Wilhelm]

... and have dirty air filters and stuff ...

 

[mettee]

Eggzackly

I know a guy

 

[PA Dan]

Little much for a work saw though imo.

Says a guy who puts a work saw cylinder on a lathe and cuts in two places then spends a lot of time with various instruments grinding, sanding and polishing! All for a work saw...[emoji6]