McCulloch Chain Saws

[PogoInTheWoods]

Was wondering if anyone has used one of these. There are less expensive versions but this one has two threaded inserts specifically for smaller applications to handle both sizes of puller bolts -- the smaller size for the pin and the larger size for the bearings. Evidently Mark has fashioned something similar.

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Here's a pretty bad video of how it's supposed to work...

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[vinnywv]

I would like to try that, till then i use sockets and a hammer to remove the pin and sockets and a bench vise to install it. It does take some funky hand work but you cant argue with success! That set up has worked for me on several saws.

 

[fossil]

View attachment 798449

Item 12 is the check valve, same part number as the check valve in the early 10 Series saws, 62909.

Tim - I may be just a bit senile...

Mark

Thanks Mark. We all get a bit forgetful as we age. You are in good company.

I'll be 68 soon and not particularly liking it.

A "how are you?" usually starts with blah, blah, blah and ends with, "Other than that I'm fine."

 

[PogoInTheWoods]

Calling all 7-10 (and 6-10) brethren! Show me your spark plugs!

Actually what I'm really interested in are transfer pics through the hole. It's looking more and more like Kevin's (now mine) 7-10 had the wrong piston for the particular cylinder transfer design from the beginning (before Mark even acquired the saw). As a matter of fact, it's looking more and more like Jethro may have nailed it some time ago when he suggested the saw may indeed just be a LH start 6-10 in the first place.

This saw has the three finger transfer ports like earlier 6-10's and some CP70's. The only other pics I've seen of 7-10 transfers are of a totally open transfer with no divider(s). There were clearly different pistons for each transfer design. The piston that came with the saw was damaged and simply replaced with a new one of the same type that would typically be used (and listed) for a 7-10 with the open transfer cylinder design.

I'm hoping for confirmation (or at least a bit more evidence) that the majority of 7-10's have open transfers and windowed pistons after serial number prefix '10' (which is what this saw is and the first in the series).That would pretty much confirm the '10' prefix as simply a LH start version of a 6-10 with a 7-10 sticker that should ideally have either a 69412 or 85340 full skirt thick ring piston for an iron bore -- instead of the more widely recommended 85239 that seems to have later superseded all other piston and ring combinations for any 70cc 2" bore application.

And while this subject has been beaten senseless and has seemingly narrowed down the possible problem with this saw, Vinny threw a new wrench into everything last night in a series of PM's with some measurements taken from both a 69412 and an 85240 he just received from Bob for his 6-10 not knowing exactly what he may find when he tore it down. Of course they have slightly different dimensions and evidently use different ring sets as well.

Gee, thanks Vinny! Just when I thought I had it nailed down! LOL Seriously though, I really appreciate all the effort on the side and the time you've taken to assist, as well as every one else.

Now more transfer pics, please!

TIA, fellas.

 

[Jethro 2t sniffer]

Calling all 7-10 (and 6-10) brethren! Show me your spark plugs!

Actually what I'm really interested in are transfer pics through the hole. It's looking more and more like Kevin's (now mine) 7-10 had the wrong piston for the particular cylinder transfer design from the beginning (before Mark even acquired the saw). As a matter of fact, it's looking more and more like Jethro may have nailed it some time ago when he suggested the saw may indeed just be a LH start 6-10 in the first place.

This saw has the three finger transfer ports like earlier 6-10's and some CP70's. The only other pics I've seen of 7-10 transfers are of a totally open transfer with no divider(s). There were clearly different pistons for each transfer design. The piston that came with the saw was damaged and simply replaced with a new one of the same type that would typically be used (and listed) for a 7-10 with the open transfer cylinder design.

I'm hoping for confirmation (or at least a bit more evidence) that the majority of 7-10's have open transfers and windowed pistons after serial number prefix '10' (which is what this saw is and the first in the series).That would pretty much confirm the '10' prefix as simply a LH start version of a 6-10 with a 7-10 sticker that should ideally have either a 69412 or 85340 full skirt thick ring piston for an iron bore -- instead of the more widely recommended 85239 that seems to have later superseded all other piston and ring combinations for any 70cc 2" bore application.

And while this subject has been beaten senseless and has seemingly narrowed down the possible problem with this saw, Vinny threw a new wrench into everything last night in a series of PM's with some measurements taken from both a 69412 and an 85240 he just received from Bob for his 6-10 not knowing exactly what he may find when he tore it down. Of course they have slightly different dimensions and evidently use different ring sets as well.

Gee, thanks Vinny! Just when I thought I had it nailed down! LOL Seriously though, I really appreciate all the effort on the side and the time you've taken to assist, as well as every one else.

Now more transfer pics, please!

TIA, fellas.

All mine are open transfer chrome bores so I'm no help sorry.

My hypothetical scenario went like this. It lived a long and successful life chewing trees with ease and 1 day someone decided to rebuild it and ordered a piston the way the numbers intended and yeah never ever ran right. He tried and tried and gave up. Another poor chap acquired the 7-10 from hell and after giving up he decided to pull it down and while doing that took that chunk out of the piston with a "something" in the bore eg clutch removal. Or perhaps while being stripped for parts.

But anyway the evidence is still stacking up for that skirt poge. 54cc shows the same 57cc went to the later style piston and ports all the 70s so far show that same pattern

So the difference in vinny's with the rings still has that same skirt?

 

[Jethro 2t sniffer]

Forgot to mention the new 850 runs amazing very very happy

 

[PogoInTheWoods]

All mine are open transfer chrome bores so I'm no help

That does help. The more evidence of the open transfers, the more the theory holds up. Now did they only go to open transfers with the chrome bore? I'd guess, yes, but who knows. That's a whole new bag o' snakes trying to determine break points in cylinder assembly part numbers vs. serial prefixes, model numbers, etc.

I'll let Vinny explain the dimensional differences between the two pistons, but they are both full skirt pistons. Limited research in the IPLs suggests they also use different rings sets and both are thick ringed.

 

[rwoods]

Forgot to mention the new 850 runs amazing very very happy

Good, Now run the 800 in one hand and the 850 in the other and let us know your impressions. I dare say with the q-port upside down in Zland they will be very close in performance. Ron

 

[Jethro 2t sniffer]

That does help. The more evidence of the open transfers, the more the theory holds up. Now did they only go to open transfers with the chrome bore? I'd guess, yes, but who knows. That's a whole new bag o' snakes trying to determine break points in cylinder assembly part numbers vs. serial prefixes, model numbers, etc.

I'll let Vinny explain the dimensional differences between the two pistons, but they are both full skirt pistons. Limited research in the IPLs suggests they also use different rings sets and both are thick ringed.

Right well that's good then still goes along with the evidence.

Good, Now run the 800 in one hand and the 850 in the other and let us know your impressions. I dare say with the q-port upside down in Zland they will be very close in performance. Ron

Yeap all well and truly upside down here haha.

Ron to be honest with the very open exhaust setup on the 800 it seems very very close. I have the reed still in the 850 and its fairly quiet infact really quiet compared to the 800. The 800 is a fire breathing monster with that exhaust.

I feel like the 850 perhaps has a bit more staying power really under a big load and down in the rpm the 800 seems to lose a bit down at the bottom but up higher in the range it almost seems opposite.

Perhaps it's just the exhaust reed perhaps its just sound. The clutch is a little tired on the 800. Its all not very scientific at all

They are both weapons the old muffler on the 800 and an open cover it really really is a beast and sounds amazing.

The tat tat idle of the 850 is amazing I really like it I will remove that reed next time and get rid of the terrible Oregon semi chisel chain.

It was new had been ran a bit it took four sharpenings before it finally came nice (ish) the stihl semi in comparison is far nicer it self feeds with out being grabby and pulley it's much nicer.

I'm finding same with carlton semi too it's just not worth the 10 bucks price difference.

Anyway bla bla very happy to have both 82cc styles need an 81 now

 

[2broke2ride]

That does help. The more evidence of the open transfers, the more the theory holds up. Now did they only go to open transfers with the chrome bore? I'd guess, yes, but who knows. That's a whole new bag o' snakes trying to determine break points in cylinder assembly part numbers vs. serial prefixes, model numbers, etc.

I'll let Vinny explain the dimensional differences between the two pistons, but they are both full skirt pistons. Limited research in the IPLs suggests they also use different rings sets and both are thick ringed.

I should have the 5-10 pulled totally down tonight and I will get some pictures for you Poge. I think we both know already what it will look like.
On another note, I have ordered the necessary parts for the PM700!

 

[fossil]

Calling all 7-10 (and 6-10) brethren! Show me your spark plugs!

Actually what I'm really interested in are transfer pics through the hole. It's looking more and more like Kevin's (now mine) 7-10 had the wrong piston for the particular cylinder transfer design from the beginning (before Mark even acquired the saw). As a matter of fact, it's looking more and more like Jethro may have nailed it some time ago when he suggested the saw may indeed just be a LH start 6-10 in the first place.

This saw has the three finger transfer ports like earlier 6-10's and some CP70's. The only other pics I've seen of 7-10 transfers are of a totally open transfer with no divider(s). There were clearly different pistons for each transfer design. The piston that came with the saw was damaged and simply replaced with a new one of the same type that would typically be used (and listed) for a 7-10 with the open transfer cylinder design.

I'm hoping for confirmation (or at least a bit more evidence) that the majority of 7-10's have open transfers and windowed pistons after serial number prefix '10' (which is what this saw is and the first in the series).That would pretty much confirm the '10' prefix as simply a LH start version of a 6-10 with a 7-10 sticker that should ideally have either a 69412 or 85340 full skirt thick ring piston for an iron bore -- instead of the more widely recommended 85239 that seems to have later superseded all other piston and ring combinations for any 70cc 2" bore application.

And while this subject has been beaten senseless and has seemingly narrowed down the possible problem with this saw, Vinny threw a new wrench into everything last night in a series of PM's with some measurements taken from both a 69412 and an 85240 he just received from Bob for his 6-10 not knowing exactly what he may find when he tore it down. Of course they have slightly different dimensions and evidently use different ring sets as well.

Gee, thanks Vinny! Just when I thought I had it nailed down! LOL Seriously though, I really appreciate all the effort on the side and the time you've taken to assist, as well as every one else.

Now more transfer pics, please!

TIA, fellas.

Hi Poge,

I just checked both of my 7-10's and both have chrome bores with divided transfers. Two finger ports. Easy to see through the plug hole.

I have no camera that will allow a pic.

 

[PogoInTheWoods]

Thanks, guys. (You're gonna like that PM700, Kevin!)

And speaking of which, Tim..., interesting that your 7-10's have PM700 style transfers. Do they have the tag numbers? How about your PM700 cylinder?

 

[Jethro 2t sniffer]

Thanks, guys. (You're gonna like that PM700, Kevin!)

And speaking of which, Tim..., interesting that your 7-10's have PM700 style transfers. Do they have the tag numbers? How about your PM700 cylinder?

I'm very interested also. Are they points or electronic?

I also remember yours have op levers mine do not

 

[2broke2ride]

Here you go Poge, as expected.

 

[PogoInTheWoods]

Yessir. Thanks.

 

[Maintenance supervisor]

Here you go Poge, as expected.

Just too be clear with the factory disassembly, was the short skirt on the exhaust side?

 

[Jethro 2t sniffer]

Here you go Poge, as expected.

Looks like you got a good engine there Kevin

 

[fossil]

Both PM700's have divided transfers
The older one is,

600061B SN 12-044330

The 7-10's

600052D SN 17-11979

600052E SN 17-10211

I could be mistaken but the transfers look larger on the 7-10's

I'll have another look tomorrow and have them side by side if I get time.

 

[PogoInTheWoods]

Thanks, Tim. I appreciate the additional data.

 

[Goinwheelin]

Nice saw Kevin that thing is real clean. And nice one Poge you let go of a dam fine saw there for a fellow enthusiast

I dragged home a saw today I can't take pictures so here is the listing pics
View attachment 798283 View attachment 798284

It's very nice just a bit of "ute" rash and still has its read and screen in the muffler. bummer of a half wrap and soft sad miserable AV mounts.

Seems to have great compression and runs nice. It's that solid somehow perfectly sealed feeling as you try and turn it over then give up and push the valve in.

Very happy. It cost me alot but it is nice

Welcome to the club Homie I’m happy for you.