McCulloch Chain Saws

[Brian13]

That sucks Charles. Im with Lee and Randy, crank it down. Should work, and it wont hurt anything to try.

 

[genestar]

$10

That's what I was thinking....he wants $65 OBO.....:taped:

 

[RandyMac]

That's what I was thinking....he wants $65 OBO.....:taped:

Tell him that shop time for repairs is $55

 

[Overtrained]

Not really i got a 101 with a busted crankmkeyway like that a few years ago someone had welded up and ground smooth they covered their patchup with a clutch and the moment i went to remove such it fell in half

Mungrels best replace it

McBob.

Whoever welded it most likely didn't have the welder amps set hot enough.

 

[cpr]

For the 2 times a year I'll run it from here on out, I may just torque it down and leave it. While I mull that over I dragged back out the D44 keen gave me to see if I can get a spark this time. When I last left it, I had all NOS ignition parts and still no worky.

 

[homelitejim]

Has anyone done the math on what size bore and stroke it would take to get 99cc out of a 10X series case? I can probably have a crank, rod, piston, and cylinder drawn up in a cad program but I am waiting on what it might cost me material and labor wise. I would probably let the computer take a 3D pic of a 82cc top end and have it enlarged enough to get the displacement, then work the base, intake, and exhaust back down to the original 82cc size so it will bolt up common parts.

 

[RandyMac]

Has anyone done the math on what size bore and stroke it would take to get 99cc out of a 10X series case? I can probably have a crank, rod, piston, and cylinder drawn up in a cad program but I am waiting on what it might cost me material and labor wise. I would probably let the computer take a 3D pic of a 82cc top end and have it enlarged enough to get the displacement, then work the base, intake, and exhaust back down to the original 82cc size so it will bolt up common parts.

I ran across someone that bored a PM80 out and put in a cast iron liner, I think they said it was 90cc.
I'll see about hunting down that site, it was quite awhile ago.
Is there enough material to bore one out to that size?

 

[Eccentric]

Has anyone done the math on what size bore and stroke it would take to get 99cc out of a 10X series case? I can probably have a crank, rod, piston, and cylinder drawn up in a cad program but I am waiting on what it might cost me material and labor wise. I would probably let the computer take a 3D pic of a 82cc top end and have it enlarged enough to get the displacement, then work the base, intake, and exhaust back down to the original 82cc size so it will bolt up common parts.

The math would be easy. Look at the B/S of a Mac 550 or 740. Those are both 99cc. You can play around with the numbers a bit to find the best 'fit'. I'll play with the numbers and give you some possible combinations to look at tomorrow morning. Port timing will need to be altered depending on what stroke you settle on. To achieve the increased stroke, you may be able to offset grind a stock crank and run a rod with a smaller big end bearing. Another way to go would be to have a custom full circle crand fabbed up. Getting into big bucks here....

 

[RandyMac]

Engine Cubic Inch/CC Displacement Calculator

2.25" bore

 

[rwoods]

Has anyone done the math on what size bore and stroke it would take to get 99cc out of a 10X series case? I can probably have a crank, rod, piston, and cylinder drawn up in a cad program but I am waiting on what it might cost me material and labor wise. I would probably let the computer take a 3D pic of a 82cc top end and have it enlarged enough to get the displacement, then work the base, intake, and exhaust back down to the original 82cc size so it will bolt up common parts.

I have. But since I don't seem to have the time or free cash to follow up on all my plans, I'll share with you my stalled RandyMac inspired vision of a 100cc Ten Series (code name - the WoodsMAC). Assuming the custom pistons are affordable, I envision a bore of 2.28" after a Nikasil plate with a custom ceramic coated piston that accepts 125 rings. Boring and plating will run around $200 per cylinder. I don't yet have a quote on the pistons but I know there is a minimum order quantity. With the goal of producing a reliable work saw, I was going to start with porting as is and I would just see how it will run. Of course, the timing will be changed a little due to the existing flares of the ports. I have several 800 cylinders for boring and stock pistons for samples but I have yet to approach the piston manufacturer. I also have in mind a few other mods for the WoodsMAC that I will keep to myself for now. :msp_wink: Ron

PS FWIW to those who like to call dibs, if I do this little project all my cylinders are already spoken for.

 

[Nardoo]

If anyone has a Partner P100 Super pulled down i would dearly luv to see a few pics internally of the Super piston and cylinder to compare with the P100.

G'day Bob, my 1020 is based on the Super and the PM1000 I have is the earlier model. I have had them apart and there is a clear difference in the pistons. The PM1000 has a piston the same as a Husqvarna K900 but the Super is different and if memory serves me correctly looks more like a 395 piston. Modifiedmark and Jacob have a lot of information on this. I cannot remember how the porting differs - my old brain struggles at times!:msp_biggrin:
I will have a look at the seriel number when I get home.

PM1000 on the left, new OEM K900 on right, .

Al.

 

[homelitejim]

I think the problem we are going to have is getting it stuffed into a 10-10 body without some modification, I was looking at my SP 81 and there is not much room to play with.

I will tear apart the CP 70 block and do some measuring to see if a simple bore job and sleeve will get it to 6 cubes, man that would be a lot cheaper and easier than manufacturing a new cylinder, I do have a good friend who is a machinist and a creative one at that so I will run it by him this weekend to see what he thinks. I am not good with the kind of math it takes to figure out durations and timing on the intake and exhaust and getting them to make the best power, I am just a simple wrench monkey who occasionally gets lucky.

 

[RandyMac]

I have some cylinders, both types.

 

[homelitejim]

I have. But since I don't seem to have the time or free cash to follow up on all my plans, I'll share with you my stalled RandyMac inspired vision of a 100cc Ten Series (code name - the WoodsMAC). Assuming the custom pistons are affordable, I envision a bore of 2.28" after a Nikasil plate with a custom ceramic coated piston that accepts 125 rings. Boring and plating will run around $200 per cylinder. I don't yet have a quote on the pistons but I know there is a minimum order quantity. With the goal of producing a reliable work saw, I was going to start with porting as is and I would just see how it will run. Of course, the timing will be changed a little due to the existing flares of the ports. I have several 800 cylinders for boring and stock pistons for samples but I have yet to approach the piston manufacturer. I also have in mind a few other mods for the WoodsMAC that I will keep to myself for now. :msp_wink: Ron

PS FWIW to those who like to call dibs, if I do this little project all my cylinders are already spoken for.

What is yours is yours. I will share what I find out, but as money is tight at the moment I was going the friend route with maybe a one off piston and cylinder to start just to see if we could get a running example and then work from there. I am purely doing this just for the fun of it and for the fun of running a fairly light compact 6 cube saw.

With the 2.28 bore is that using the same crank and connecting rod of the 82 cc block or is increasing the stroke required?

 

[RandyMac]

What is yours is yours. I will share what I find out, but as money is tight at the moment I was going the friend route with maybe a one off piston and cylinder to start just to see if we could get a running example and then work from there. I am purely doing this just for the fun of it and for the fun of running a fairly light compact 6 cube saw.

With the 2.28 bore is that using the same crank and connecting rod of the 82 cc block or is increasing the stroke required?

same crank and rod.

 

[struggle]

That's what I was thinking....he wants $65 OBO.....:taped:

I have been giving a couple of them over the last year. Not worth a lot and much hated by many

I kind of like them but don't want anymore currently:msp_sneaky:

 

[rwoods]

What is yours is yours. I will share what I find out, but as money is tight at the moment I was going the friend route with maybe a one off piston and cylinder to start just to see if we could get a running example and then work from there. I am purely doing this just for the fun of it and for the fun of running a fairly light compact 6 cube saw.

With the 2.28 bore is that using the same crank and connecting rod of the 82 cc block or is increasing the stroke required?

I think the problem we are going to have is getting it stuffed into a 10-10 body without some modification, I was looking at my SP 81 and there is not much room to play with.

I will tear apart the CP 70 block and do some measuring to see if a simple bore job and sleeve will get it to 6 cubes, man that would be a lot cheaper and easier than manufacturing a new cylinder, I do have a good friend who is a machinist and a creative one at that so I will run it by him this weekend to see what he thinks. I am not good with the kind of math it takes to figure out durations and timing on the intake and exhaust and getting them to make the best power, I am just a simple wrench monkey who occasionally gets lucky.

No stroke change. As Aaron said big bucks. Other than some unrelated mods, I intended to use all MAC parts except the piston itself. These parts would be standard 82cc parts except the 125 rings. If you look at your 82cc cylinder just imagine that you are going to shave 1/8 inch all the way around the bore. I think there is room unless you are going to use a sleeve. You will lose some of the entry bevel which may make installing the piston difficult but I think it will work. Getting a quote on the piston is my hold up.

I didn't mean to suggest by my PS that I thought you personally might want dibs. I just know this seems to be a popular AS thing to do and while I have several saws available for this wishful project, the dream includes not only the fun and cool factors but also where these saws would go.

Is your friend capable of milling a piston? If so, maybe we can work together and save some $$$. I have a NOS stock 82 cc piston with bearings and a NOS 125 piston with rings for measurement purposes. My thinking on boring and plating the cylinder is to stick with someone that specializes in this as I am not interested in spending the bucks and not having a durable cylinder.

Ron

 

[ozflea]

G'day Bob, my 1020 is based on the Super and the PM1000 I have is the earlier model. I have had them apart and there is a clear difference in the pistons. The PM1000 has a piston the same as a Husqvarna K950 but the Super is different and if memory serves me correctly looks more like a 395 piston. Modifiedmark and Jacob have a lot of information on this. I cannot remember how the porting differs - my old brain struggles at times!:msp_biggrin:
I will have a look at the seriel number when I get home.

PM1000 on the left, new OEM K950 on right, .

Al.

From what you have shown above those are the standard run of the mill pistons in the 3 different saws Partner Mac and 1020 now what i need is a pic of the super piston.
The Partner IPL lists different set of numbers for the Super Piston assy

and the standard piston and cylinder below

I think but not sure the diffence between the two was the circlips ??



McBob.

 

[Nardoo]

From what you have shown above those are the standard run of the mill pistons in the 3 different saws Partner Mac and 1020 now what i need is a pic of the super piston.
The Partner IPL lists different set of numbers for the Super Piston assy
McBob.

Bob,
Yes, they are standard pistons - what I am saying is my 1020 must be a Super as it has a different piston. It also has the side brace and a different filter set up. I do not have a pic of the piston as it is back together now.

Al.

 

[ozflea]

Bob,
Yes, they are standard pistons - what I am saying is my 1020 must be a Super as it has a different piston. It also has the side brace and a different filter set up. I do not have a pic of the piston as it is back together now.

Al.

There were two types of airfilter a screen and a flocked filter

The screen filter was origionally fitted but superceeded as it let too much fine dust through so Mac upgraded to the flocked

The early P1OO'S and the EARLY PM1000 had no side brace that came later to stiffen the handles

DID YOUR SUPER PISTON LOOK LIKE THIS

The piston above is from a k950 much the same as the 2100husky piston as i have one here in front of me but it has 2 rings
did the 1020 piston have 2 rings .... maybe the 2100 huskie thin ring piston would fit ?

The K950 piston uses a larger diameter wrist pin than the PM1000 / P100.