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

[David Young]

Predictions? View attachment 248873

Clean looking saw

 

[mdavlee]

Predictions? View attachment 248873

Hopefully not a crank out of time. Has that one been welded?

 

[RI Chevy]

Already runs good

 

[huskyboy]

Hopefully not a crank out of time. Has that one been welded?

Yes, and also on the newer serial # solo’s apparently it is less of an issue and they revised the crank or something along those lines from what I heard. The bearings in the solo are the same size as a 395 or 660 on both sides (unlike the 7900 with a 6202 on the flywheel side). Obviously I would never advise to anyone to run a 42” bar on a saw this size full time. For a test cut or two? It’s fine and provides some interesting info regarding the potential of the saw.

 

[huskyboy]

Personally I think some of the problem with the solo crank is the piston is too heavy for it, fitting the lightweight 7910 slab side piston reduces weight and vibrations significantly in both the 7900 and 681 solo. There is a reason why the engineers reduced the weight of the piston that much in the newer 7910... it’s close to the same weight as a smaller 6400/665 piston which the crank/rod was designed for. Coincidence? I don’t think so. It’s not really rocket science to figure this out.

 

[redlight066]

Yes, and also on the newer serial # solo’s apparently it is less of an issue and they revised the crank or something along those lines from what I heard. The bearings in the solo are the same size as a 395 or 660 on both sides (unlike the 7900 with a 6202 on the flywheel side). Obviously I would never advise to anyone to run a 42” bar on a saw this size full time. For a test cut or two? It’s fine and provides some interesting info regarding the potential of the saw.

Bearings are supersized on the Solo. 6303 pto side, 6302 flywheel side.

 

[huskyboy]

 

[huskyboy]

Bearings are supersized on the Solo. 6303 pto side, 6302 flywheel side.

Yes and that’s why they are noticeably heavier than the 7900. Heavier chassis and a few more parts as well.

 

[redlight066]

Yes and that’s why they are noticeably heavier than the 7900. Heavier chassis and a few more parts as well.

Lemme go check my saw for extra parts.

 

[huskyboy]

Lemme go check my saw for extra parts.

Carb box lines/foam pieces in carb box, primer circuit and bulb, extra plastic in top cover shroud, tank vent circuit line to carb box, extra screws in miscellaneous places (one being the case protector on pto side and the handle bar spring setup). This stuff adds up. I’m sure I’m missing a few things but that’s what I can remember off the top of my head. Anything else you would like to add?

 

[redlight066]

Foam is heavy. Ain’t you got a tree to go cut down? Treetard.....

 

[huskyboy]

Foam is heavy. Ain’t you got a tree to go cut down? Treetard.....

Is that really the best you got?

 

[redlight066]

Is that really the best you got?

It really doesn’t take that much. Just keep talking about what you don’t know about.

 

[huskyboy]

It really doesn’t take that much. Just keep talking about what you don’t know about.

Well, I was right about the solo crank bearings being larger... and the solo having more parts. So what’s your point? Explain...

 

[redlight066]

The bearings in the solo are the same size as a 395 or 660 on both sides (unlike the 7900 with a 6202 on the flywheel side).

6203’s on both sides of the 395.

Edited ur quote there. Proprietary bearing (Oversized 6302) on the PTO side of the 661 and standard 6302 on the flywheel

 

[huskyboy]

6203’s on both sides of the 395.

Edited ur quote there. Proprietary bearing (Oversized 6302) on the PTO side of the 661 and standard 6302 on the flywheel

The inside diameter that holds the crank is the same as a 395 or 066 bearing. The outside diameter and width are the main difference. So I guess if you want to get technical your right. But that was beside my point. My point was the solo has large bearings to handle a long bar.

 

[redlight066]

Hahahaha!!! Glad you have a sense of humor. Have a good night. I’ll work on my form and chains. Promise

 

[mdavlee]

Yes, and also on the newer serial # solo’s apparently it is less of an issue and they revised the crank or something along those lines from what I heard. The bearings in the solo are the same size as a 395 or 660 on both sides (unlike the 7900 with a 6202 on the flywheel side). Obviously I would never advise to anyone to run a 42” bar on a saw this size full time. For a test cut or two? It’s fine and provides some interesting info regarding the potential of the saw.

I know the racers didn’t have as much trouble as the ones working the woods and getting pinched and pulled on. I was just curious since it’s not the end of the world go have to put it back and weld it. It’s just a bit of a pain to split them.

 

[huskyboy]

I know the racers didn’t have as much trouble as the ones working the woods and getting pinched and pulled on. I was just curious since it’s not the end of the world go have to put it back and weld it. It’s just a bit of a pain to split them.

Makes sense to me Mike. Maybe the 37mm dolmar crank is a better choice for a loggers saw that will get beat on? The performance difference between the two doesn’t seem to be extreme to me, but that is subjective opinion. There does seem to be a bit more torque with the solo from the limited time I ran the 665 and 665/7910 hybrid. The dolmar crank saws seem to have good response. But that could be related to things other than the crank. What one were you able to get stronger?

 

[mdavlee]

Makes sense to me Mike. Maybe the 37mm dolmar crank is a better choice for a loggers saw that will get beat on? The performance difference between the two doesn’t seem to be extreme to me, but that is subjective opinion. There does seem to be a bit more torque with the solo from the limited time I ran the 665 and 665/7910 hybrid. The dolmar crank saws seem to have good response. But that could be related to things other than the crank. What one were you able to get stronger?

I only messed with one Solo and none with the actual 681 top end. I think the 7900s were stronger but we’d have to put them on the dyno to see. The strongest ones probably went to people not on the forums any more.