McCulloch Chain Saws

[heimannm]

Struggle - It certainly is possible to open the center hole in the exhaust to help it breathe but I am not sure if the rest of the porting is set up to take advantage of it.

Mark

 

[a. palmer jr.]

apj - A standard 250 that is fresh will put any 1-4X saw or the 200 to shame. The porting on the 250 was more aggressive including a three hole exhaust where most of the others only had two holes opened up. McC (Scott Mueller) has a stock 250 that routinely won the vintage 5 In³ (80 cc) and under competition at Baraboo until last year anyway.

The Super 250 is another notch above the standard 250 but most were 87 cc compare to the 80 cc 250, except of course for some early models. McCulloch did like to mix thing up.

CPR - sparks at the points may indicate the condenser is not properly matched to the coil. In theory at least, if they are matched the condenser "absorbs" the surge when the points open, then reverses the current flow back through the windings to speed the collapse of the magnetic field and induce a greater voltage in the secondary windings of the coil. Sparking at the points indicates some of the energy is being lost when the point open.

Mark

I think I'll go over and give it another look tomorrow afternoon. The saw is has the color of a Super 250 with the black starter and top cover. I guess it would be a steal for under $50 if it's a Super. It needs a bar and chain and I guess it's a .404.

 

[Eccentric]

I have an NOS SP-81/PM850 cylinder and 'A' piston that I can loan for measurements/mapping if needed. I did some cutting with my SP-81 on Sunday. I REALLY like that saw, and would love to have the same saw with 17-18 more cc's. This discussion makes me want to seek a 'roached' 82cc SP/PM saw to someday rebuild as an SP100/PM1001.
opcorn:opcorn:

 

[heimannm]

apj - there were a few other saws with the long black top covers and black starter cover including the 300 and 380, both were 87 cc's and pretty nice saws. If the top cover is angular rather than rounded, you may have a 450 or 550, 91 or 99 cc's.

If you need bar and chain, even a new drum with spur sprocket I can help.

Mark

 

[watsonr]

Someone tell me the diameter of the 125 piston?
Thanks,

 

[RandyMac]

2.28"

 

[watsonr]

2.28"

Thank you Sir, just what I needed.

 

[homelitejim]

Here are the first two candidates for the 100cc project, I will be on the hunt for more cylinders and some body parts tomorrow. Below is why I want to do this, not that there is anything wrong with these fine 5 cube examples.

 

[Brian13]

I really hope this works out Jim!! I think a 6cu. 10 series would put any current saw to shame.

 

[OREGONLOGGER]

Well fellas I scored a good two saws yesterday the sought after 797G gear drive made back in the late 60's by the dealer only and a rare one I don't see is the 1-61G gear drive in mint condition has the goose stamp on a big belly Mac bar. I'll get some pic's together

Cascade Saw

 

[Jacob J.]

I might have an SP-80 cylinder I could donate for an overbore/oversize project. I'll have to see if it's roached or not.

 

[OREGONLOGGER]

I have a couple of sweet SP81's sitting under my bench collecting dust..someone building one here??

 

[gomlin]

So I got this very large McCulloch, sold to me as a 895. It has no model markings that I can find. Is this indeed an 895? How can I identify if it is an 895c? Can anyone identify the carb in the pic? I do believe I will need a carb kit to get it going again. I know it is dirty, this is exactly how it came out of the shipping box. Thanks for your time folks,

 

[OldDeadWood]

895

gomlin

Clean up, and take some pics of the bottom.

ODW

 

[54stude]

So I got this very large McCulloch, sold to me as a 895. It has no model markings that I can find. Is this indeed an 895? How can I identify if it is an 895c? Can anyone identify the carb in the pic? I do believe I will need a carb kit to get it going again. I know it is dirty, this is exactly how it came out of the shipping box. Thanks for your time folks,

I believe this is a 890, due to the lack of a DSP valve (compression release). Could also be an 840?

Any numbers on the bottom?

 

[dieselsmoke]

Oh my, what a big saw you have!!!! Said the little red wood cutter.
Gomlin, pull the muffler and use your dial caliper to take two measurements, ex. port face to piston skirt and ex. port face to the far side cylinder wall. Subtract the small number ( first measurement ) from the big number and you will have the bore size. 840 is the small size at 2.165", 890 and 895's are 'bout 103cc's and should measure 2.217". The 895 has a DSP under the air box . LET US know what you come up with.

 

[homelitejim]

Picked up this Mac today, tore it all apart cleaned it up and put it back together. Just as I was thinking that it wasn't too bad I realized I forgot to clean out the carb, now I am looking at it a little differently.

 

[HeRoze]

i went shopping today. the guy was young to have so many saws, and has sold some stuff to a few folks here. i rummaged through what was left over and picked up a couple of nice ones. mostly macs. pretty sure that is a S-250 in the middle, some nice bars, and a rough sign that looks good in the shop.

 

[hoss]

So I got this very large McCulloch, sold to me as a 895. It has no model markings that I can find. Is this indeed an 895? How can I identify if it is an 895c? Can anyone identify the carb in the pic? I do believe I will need a carb kit to get it going again. I know it is dirty, this is exactly how it came out of the shipping box. Thanks for your time folks,

Lord knows i've been wrong before, but to me it looks like no auto oiler=840.

 

[gomlin]

Well I looked on the bottom and it is stamped 740 and 840. So I'm guessing I got an 840 not the 895 I thought I was buying. Guess thats the chance you take with Craigslist out of state buys. At least I didn't pay squat for it. Are carb kits available for this beast?

gomlin

Clean up, and take some pics of the bottom.

ODW