McCulloch Pro Mac 700

[homelitejim]

I picked up a CP70 cheap because someone melted the piston, fortunately I had a roughed up PM850 with a pristine engine block and I made the swap, total investment about $60.

[video=youtube;OuA0W9APlbE]http://www.youtube.com/watch?v=OuA0W9APlbE[/video]

It is a pro saw through and through.

 

[2Twannabe]

I picked up a CP70 cheap because someone melted the piston, fortunately I had a roughed up PM850 with a pristine engine block and I made the swap, total investment about $60.

[video=youtube;OuA0W9APlbE]http://www.youtube.com/watch?v=OuA0W9APlbE[/video]

It is a pro saw through and through.

Nice vid. I had to run out to the garage and get my muffs.

 

[half_full]

Here's what I'm up against...

I've already sourced and ordered the parts. Hope this has a happy ending.

Remarks re: finding a running saw for what I plan to spend repairing this one are duly noted, but where would be the fun and the challenge in that? I get a lot of satisfaction in taking something that someone else gave up on and returning it to it's rightful place as a useful tool. And then there's the part about having a good running pro saw for a third (or less) of the price of a new saw, and one that not many of my pals have ever seen to boot.

I suspect there are many of you who feel the same way.

Regards,
Jeff

You have inspired me to get mine off the shelf and take it along on the next trip. And yes, I typically spend enough on my saws to ensure I can't recoup the investment. So therefore cannot sell them...

 

[Modifiedmark]

I find the PM700 to be slower and heavier than a 7-10, but generally they are a lot more durable. Certainly they are very capable saws and when properly care for will cut a lot of wood.

Keep an eye on e-bay as you may well be able to pick up a running saw for what you are plannning to spend for parts, then over time you can add some parts as needed (rings, piston, cylinder) to keep that saw running forever.

As Scooterbum points out, hearing protection is a must as the old McCulloch saws are loud.

Enjoy.

Mark

I found the same to be true about the 7-10 vrs PM700. I have had both.

 

[bplust]

I find the PM700 to be slower and heavier than a 7-10, but generally they are a lot more durable. Certainly they are very capable saws and when properly care for will cut a lot of wood.

Keep an eye on e-bay as you may well be able to pick up a running saw for what you are plannning to spend for parts, then over time you can add some parts as needed (rings, piston, cylinder) to keep that saw running forever.

As Scooterbum points out, hearing protection is a must as the old McCulloch saws are loud.

Enjoy.

Mark

Mark-

I haven't had to tear any of my 5 70cc Macs (3x 7-10a, 2x pm700) apart, so I haven't taken a look in the cylinders, but is there much difference between the two inside (all I know of differences for sure is the ignition bolt patterns)?

Regarding reliability, are you speaking of points vs electronic ignition?

I too have found that the 7-10a's are a bit stronger, but haven't had a good enough reason to check the porting out. Also, I've never ran a cp70 or a 5-10, how do these stack up in power?

Bryan

 

[homelitejim]

Mark-

I haven't had to tear any of my 5 70cc Macs (3x 7-10a, 2x pm700) apart, so I haven't taken a look in the cylinders, but is there much difference between the two inside (all I know of differences for sure is the ignition bolt patterns)?

Regarding reliability, are you speaking of points vs electronic ignition?

I too have found that the 7-10a's are a bit stronger, but haven't had a good enough reason to check the porting out. Also, I've never ran a cp70 or a 5-10, how do these stack up in power?

Bryan

My CP70 runs like a PM850, I did not get a chance to run it with the original engine so I do not know how it would stack up.

 

[bplust]

My CP70 runs like a PM850, I did not get a chance to run it with the original engine so I do not know how it would stack up.

Nice video, Jim. I'm jealous!

Do the 80cc Mac motors (sp81, pm800, pm850) bolt right into all of the 70cc saws (7-10a, pm700) or does it only work with the CP70 due to antivibe?

 

[kgip2k]

I think I talked to the guy about that saw, not a bad price for it, but the guy didnt seem to know or acted like he had no clue about it. I got 2 calls on 2 seperate days because he could not even remember who was coming to look at it and he thought it was me that was supposed to be coming to check it out.

 

[homelitejim]

Nice video, Jim. I'm jealous!

Do the 80cc Mac motors (sp81, pm800, pm850) bolt right into all of the 70cc saws (7-10a, pm700) or does it only work with the CP70 due to antivibe?

I just bolted the body parts of the CP70 right onto the PM850 engine block. I will have to look but I think it could be possible with any of the 10 series.

 

[Eccentric]

I picked up a CP70 cheap because someone melted the piston, fortunately I had a roughed up PM850 with a pristine engine block and I made the swap, total investment about $60.


It is a pro saw through and through.

Giveya $65 for it Jim...:jester:

 

[NORMZILLA44]

Figured I could find Aaron and Jim here:cool2: Gotta love an old war horse, that has stood the test of time.

 

[Eccentric]

Figured I could find Aaron and Jim here:cool2: Gotta love an old war horse, that has stood the test of time.

Yep. I really like the PM700 that I got from you Norm. It's my 'go to' saw much of the time. I also have a 7-10A to compare it to.....but haven't gotten it running yet. Maybe I'll go do that this afternoon. I'm curious about whether the 7-10A really runs any stronger than the PM700. It is a bit lighter, but only due to the short non-chainbrake clutch cover and smaller muffler (compared to the larger muffler and long 'muffler guard' chainbrake CC on the PM700). I have a short CB clutch cover on the way to run on that 7-10A in the places where a CB is required.

Both of these saws came from you Norm. Two of my favorites.

 

[2Twannabe]

Well, I got into the cylinder tonight and it's not nearly as good as I had hoped. The before pics I took didn't turn out well, but here's a couple pics after removing the aluminum transfer and some careful honing by hand:

As you can see, there are some fairly deep scratches in the cylinder bore. I also noticed several pin holes in the plating. At this point, I'm thinking of taking a drive to an old McCulloch dealer who's been around since '57 to see what he has laying in the parts heap. I sure don't want to put a new piston in this crappy bore. Maybe he'll have a decent cylinder (hopeful) or at least a decent used piston for cheap. At least I have parts coming in case I run across another decent PM700.

 

[heimannm]

If you happen to find two NOS pistons for the PM700 please let me know, I am need of one.

If you need other parts around the saw I have just about everything except clutch covers.

Thanks,

Mark

 

[2Twannabe]

If you happen to find two NOS pistons for the PM700 please let me know, I am need of one.

If you need other parts around the saw I have just about everything except clutch covers.

Thanks,

Mark

I ordered the piston kit from an on-line store, I'd be happy to call and see if he has another. Come to think of it, I better call and see if he even has the one I already ordered.

Jeff

 

[z50guru]

Got the old PMac7 hunnie out today for a rip :msp_w00t: Luuuuuv that sound!

<iframe width="420" height="315" src="http://www.youtube.com/embed/5qxasTWBdTA" frameborder="0" allowfullscreen></iframe>

 

[2Twannabe]

Hey guru...

The saw vid is nice, but as a fellow dirt biker, the hill climb vid is way more impressive.

 

[djones]

If you happen to find two NOS pistons for the PM700 please let me know, I am need of one.

If you need other parts around the saw I have just about everything except clutch covers.

Thanks,

Mark

Mark, If you haven't found a NOS piston yet, there is one on chainsawr. Piston and rings.

 

[2Twannabe]

Mark, If you haven't found a NOS piston yet, there is one on chainsawr. Piston and rings.

Good luck! Mine's been on back order for a month. Different source though. Got a Stihl 031AV the other day for free, so I may be shifting gears and getting the old Stihl running while I wait. Might have to part out the PM700 if the Stihl's good.

 

[Eccentric]

Good luck! Mine's been on back order for a month. Different source though. Got a Stihl 031AV the other day for free, so I may be shifting gears and getting the old Stihl running while I wait. Might have to part out the PM700 if the Stihl's good.

Ugh. That's not good news. The PM700 is three times the saw that the 031AV is..............while only weighing a tad more. Keep 'em both, or part out/sell the Stihl. I had both at one time..........and the 031AV is long gone.