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

[huskyboy]

The bearings were perfect when I built it as only had 25 hours or so use from new. I’ll double check, but I don’t think it has more than 100 hours on now!

Was it a ex rental saw? I had one come here with play on pto side. I caught it just in time.

 

[Lightning Performance]

I have two tight rental ones and well we won't talk about the third saw
Any Solo cranks around...sniff sniff

 

[stranter]

Was it a ex rental saw? I had one come here with play on pto side. I caught it just in time.

No, bought new from a dealer here in UK

 

[Wilhelm]

The bearings were perfect when I built it as only had 25 hours or so use from new. I’ll double check, but I don’t think it has more than 100 hours on now!

100 hours of work are 200+ tanks of fuel, thus over 150 liters of fuel mix.

The saw got tinkered with and was no longer to designed specs, probably got run hard too.
Damage due to material fatigue is the simple answer.

Although, the damage looks like a hung ring or piston head slap.

 

[Wilhelm]

A big thank You to @Steve for the US style 1 Klingon spikes, and an equally big thank You to Sondre @SOS Ridgerider for taking care of shipping to me.

The Klingon spikes are replacing the single inner small EU spike on my Dolmar PS-7300, this will greatly improve handling.

 

[stranter]

100 hours of work are 200+ tanks of fuel, thus over 150 liters of fuel mix.

The saw got tinkered with and was no longer to designed specs, probably got run hard too.
Damage due to material fatigue is the simple answer.

Although, the damage looks like a hung ring or piston head slap.

Thanks for the input.
100 hours is not much when falling full time (4-8 weeks use depending). I work alongside the owner, yes the saws are used hard, but are serviced very regularly.
I will double check the cylinder, but pretty sure it wouldn’t be a hung ring as I radius and bevel the ports pretty good.
Trying to make sense of it as if it was down to me of course I will put it right for him. Also don’t want the same thing happening in future.

 

[Steve]

A big thank You to @Steve for the US style 1 Klingon spikes, and an equally big thank You to Sondre @SOS Ridgerider for taking care of shipping to me.

The Klingon spikes are replacing the single inner small EU spike on my Dolmar PS-7300, this will greatly improve handling.

View attachment 223180 View attachment 223181 View attachment 223182

It needs a little more bar now!

 

[Wilhelm]

It needs a little more bar now!

I only have this little 36" Iggesund Forest bar.
Europe is not very big on long bars.

 

[old_sir_henry]

Hi y'all,
I'm just fiddling around with a serial number puzzle for the PS-7900.
Thing is, my PS-7900 No. 4 I bought in January is missing its serial number decal
next to the back handle.



What I found instead was this sticker at the bottom of the crank case magneto side:



I have been told by my Dolmar dealer that there should be a label like this one but none of my other 3 three PS-7900 had one.
This one reads

039.100.300
2007 204729

and this is where I'm getting confused.
1.
The model designation for a PS-7900 H (and this particular saw happens to be a H) is
038.100.300 — 38 not 39! Is this just a typo or what does the "039" refer to?

2.
"2007" looks like the year of production and "204729" I would assume could be a serial number.
However: The assumed serial number does not fit into the normal run of serial numbers of the PS-7900.

Out of curiosity I have recorded serial numbers of PS-7900 whenever I found a picture of one with a legible S/N-label
and harvested a small collection of existing serials together with their respective years of manufacture:

2001 031022
2004 039341
2004 040105
2004 040776
2004 041482 H
2006 045985
2006 046537
2006 047377
2006 048664 H
2006 049298
2006 049681 H
2006 050085
2007 051722
2007 052023

Looks like the serials have been a straight run of consecutive numbers
over the years and the H saws share the same number pool with the non-H.

And then comes 2007 204729 which yields a gap of about 150000 numbers.

But the again there come

2008 274472
2010 318011
2010 345904

Assuming 204729 indeed is the serial number of the saw and considering the numbers I found of the 2008 to 2010
builds, then it looks like they have abandoned the original serial number scheme about mid 2007
and have added some offset to the numbers and may be even did this multiple times (hence the gap between both
2010 numbers: Too large for production numbers)

Who knows more about this subject?
Is 204729 possibly the correct serial number of my saw?

 

[chipper1]

Hi y'all,
I'm just fiddling around with a serial number puzzle for the PS-7900.
Thing is, my PS-7900 No. 4 I bought in January is missing its serial number decal
next to the back handle.

View attachment 224385

What I found instead was this sticker at the bottom of the crank case magneto side:

View attachment 224386

I have been told by my Dolmar dealer that there should be a label like this one but none of my other 3 three PS-7900 had one.
This one reads

039.100.300
2007 204729

and this is where I'm getting confused.
1.
The model designation for a PS-7900 H (and this particular saw happens to be a H) is
038.100.300 — 38 not 39! Is this just a typo or what does the "039" refer to?

2.
"2007" looks like the year of production and "204729" I would assume could be a serial number.
However: The assumed serial number does not fit into the normal run of serial numbers of the PS-7900.

Out of curiosity I have recorded serial numbers of PS-7900 whenever I found a picture of one with a legible S/N-label
and harvested a small collection of existing serials together with their respective years of manufacture:

2001 031022
2004 039341
2004 040105
2004 040776
2004 041482 H
2006 045985
2006 046537
2006 047377
2006 048664 H
2006 049298
2006 049681 H
2006 050085
2007 051722
2007 052023

Looks like the serials have been a straight run of consecutive numbers
over the years and the H saws share the same number pool with the non-H.

And then comes 2007 204729 which yields a gap of about 150000 numbers.

But the again there come

2008 274472
2010 318011
2010 345904

Assuming 204729 indeed is the serial number of the saw and considering the numbers I found of the 2008 to 2010
builds, then it looks like they have abandoned the original serial number scheme about mid 2007
and have added some offset to the numbers and may be even did this multiple times (hence the gap between both
2010 numbers: Too large for production numbers)

Who knows more about this subject?
Is 204729 possibly the correct serial number of my saw?

Pretty sure if I had that saw in my possession I could tell you a lot more about it .
Sorry I don't know as this isn't something I've looked too deeply into, but I do really like the saw, I don't have one like that .

 

[Wilhelm]

Maybe You have a "RS" in disguise/all red.

 

[166]

Hi y'all,
I'm just fiddling around with a serial number puzzle for the PS-7900.
Thing is, my PS-7900 No. 4 I bought in January is missing its serial number decal
next to the back handle.

View attachment 224385

What I found instead was this sticker at the bottom of the crank case magneto side:

View attachment 224386

I have been told by my Dolmar dealer that there should be a label like this one but none of my other 3 three PS-7900 had one.
This one reads

039.100.300
2007 204729

and this is where I'm getting confused.
1.
The model designation for a PS-7900 H (and this particular saw happens to be a H) is
038.100.300 — 38 not 39! Is this just a typo or what does the "039" refer to?

2.
"2007" looks like the year of production and "204729" I would assume could be a serial number.
However: The assumed serial number does not fit into the normal run of serial numbers of the PS-7900.

Out of curiosity I have recorded serial numbers of PS-7900 whenever I found a picture of one with a legible S/N-label
and harvested a small collection of existing serials together with their respective years of manufacture:

2001 031022
2004 039341
2004 040105
2004 040776
2004 041482 H
2006 045985
2006 046537
2006 047377
2006 048664 H
2006 049298
2006 049681 H
2006 050085
2007 051722
2007 052023

Looks like the serials have been a straight run of consecutive numbers
over the years and the H saws share the same number pool with the non-H.

And then comes 2007 204729 which yields a gap of about 150000 numbers.

But the again there come

2008 274472
2010 318011
2010 345904

Assuming 204729 indeed is the serial number of the saw and considering the numbers I found of the 2008 to 2010
builds, then it looks like they have abandoned the original serial number scheme about mid 2007
and have added some offset to the numbers and may be even did this multiple times (hence the gap between both
2010 numbers: Too large for production numbers)

Who knows more about this subject?
Is 204729 possibly the correct serial number of my saw?

The code below the serial number is for a PS-7300

038 = PS-7900
039 = PS-7300
040 = PS-6400

Other examples
181 = PS-5000 / PS-5100s / PS-5105
180 = PS-4600 / PS-4605
179 = PS-510 / PS-500
178 = PS-460

Pre 2006 there wasn't much distribution in the US & Canada. Many more saws built 2006+ than pre 2006.

I'll PM you an excel spread sheet with a bunch of serial numbers.

 

[old_sir_henry]

Thanks a lot,
looks like I'll have to check piston diameter, maybe I have received a 7300 in place
of the advertised 7900. Badge on the starter says 7900 but that one is much easier
to change then the sticker on the crankcase.

 

[old_sir_henry]

I have measured bore: 52mm thus the saw has a 7900 top-end. Might have been born as 7300 though...

And thanks to the serail numbers Steve sent me, my assumption that in mid 2007 and several times
afterwards Dolmar did skip ranges of serial numbers by tenth of thousands seems to be confirmed.
Was this done to obfuscate the real production numbers?

 

[ajschainsaws]

View attachment 215284Trash-canned. View attachment 215285 View attachment 215283 Installed.

good fix there another choice if you ve got any lying around in parts bins
Are the spacers from the top bolt of a ps-420 muffler

 

[Wilhelm]

Yesterdays 36" PS-7900 fun, large oak crotch.

 

[David _4]

Wilhelm, I know you have mentioned this before, but do your 6400, 7300 and 7900's all adequately oil a 36" bar? The longest I run now is a 28", but have an occasional need for a 36" bar.

 

[Wilhelm]

Wilhelm, I know you have mentioned this before, but do your 6400, 7300 and 7900's all adequately oil a 36" bar? The longest I run now is a 28", but have an occasional need for a 36" bar.

The majority of times I just shake my head when there are arguments about the PS-64xx/73xx/79xx putting out insufficient oil!

All four of my large frame Dolmar's will oil my 36" B&C setup more than sufficient bucking fresh and semi fresh logs.
None of my saws has any oiler pump mods.
Dry seasoned logs may require more oil, but I never encounter "fully dried large logs" that would call for a 36" B&C setup.

I did open up the oiler holes on my 36" Iggesund Forest bar!

After bucking up a large log I can shut down the saw lift the chain out of the bars bottom side groove and clearly see the drive links being wet with oil.
Is there oil dripping off the chain after finishing a bucking cut?
No, and it doesn't need to!

 

[huskyboy]

Wilhelm, I know you have mentioned this before, but do your 6400, 7300 and 7900's all adequately oil a 36" bar? The longest I run now is a 28", but have an occasional need for a 36" bar.

Do they oil as good as a 372/390xp? No. But they usually oil better than a 440/441/460 do. Most of the time when people have oiling problems with them the little plastic oiler control bolt is worn out. A easy fix if you go back thru the thread I posted how to take apart the oiler. If I wanted to run a 36” bar all the time I would be looking at a 90cc class saw though... once in a while? Yeah a healthy 7900 will do it.

 

[Wilhelm]

Do they oil as good as a 372/390xp? No. But they usually oil better than a 440/441/460 do. Most of the time when people have oiling problems with them the little plastic oiler control bolt is worn out. A easy fix if you go back thru the thread I posted how to take apart the oiler. If I wanted to run a 36” bar all the time I would be looking at a 90cc class saw though... once in a while? Yeah a healthy 7900 will do it.

A 9010 can literally pi$$ oil compared to the 64xx/73xx/79xx!