McCulloch Chain Saws

[GASoline71]

Randy... that Super 250 is sick mang!!! One of the coolest ones I've seen!

Gary

 

[leeha]

Here ya go Randy and Cliffy,
This came in today, Model Super LG2 and
came with this bow bar. Not sure if
it's original to the saw. But looks good.
And runs well also. Just needs a muffler
or just the muffler cover. Hint, Hint.

Lee

QUOTE]

Looks to be in nice shape Lee. Well I might of had a muffler cover
but you called me the wrong name so I don't think
I could look for it now.

I'm Sorry Cliff
Could you look now PAAALEASE.


Lee

 

[swamprat46]

Congrats Lee, you saved me! I was thinking about grabing it because it was pretty, thought about making an offer, decided I should really think about selling at least one. I decided to look one more time and it was gone! Really happy someone here got it, and we all get to share

John

 

[heimannm]

All this talk about the Super 250 stirred me enough that I got my "good" one down last night to see what I could find. I picked this one up about a year ago from Injun Joe, took it home and started it once, then put it up waiting for the right time to clean it up and maybe put it to a little use.

When I took it down last night I decided it was fairly clean already, no need to tear it down for a thorough scub inside and out. Look in the fuel tank, a little old fuel but it didn't smell bad so I simply topped it off, a squirt of prime down the carburetor, and it was running. Automatic and manual oilers work fine, and I had a decent "age appropriate" bar from another saw so all I had to do was make up a chain, find a couple of bar plates, and put it together.

This particular one has the McCulloch/Walbro flat back carburetor, but with a choke instead of a primer. I did take a close look at my other Super 250 and see it is equipped with the Tillotson, looks to be original equipment as well. From the looks, this one had been stored in a damp location somewhere along the way so the paint and some of the magnesium has a bit of oxidation.

Well anyway, if I can find a little room in the truck I will carry this one along to the PNW GTG 12/13 June and give it some run time.

Mark

 

[heimannm]

Brian, if you were to measure the crankshaft very carefully you will find the Super 250 has a stroke of 1.500", the standard 250 is 1.375", hard to see .0625" difference in the throw when they are just setting there.

The Super 250 cylinder is on the left in your photo, notice the bigger "window" below the intake for starters, then if you look in the "third port" to the right of the intake, you may discover an extra hole as well.

I'm not sure is they changed the exhaust port(s) on the Super 250's, most of the 80/87cc saws have three open holes in the exhaust, some early saws have only 2 holes open, and I have one cylinder at home that I cannot identify that has one large oval opening and a sort of step in the exhaust port. The cylinder is equipped for a compression release like the 795/797 type saws but has (had) a chrome plated bore.

Mark

 

[gallegosmike]

I got this real nice Double Eagle 80 a few weeks ago. It came with
no bar and chain. I had the bar and I made up a chain for it.
It runs real nice. Thanks again BillG.

That is nice looking saw! I really like the shape of them mac saws. It is really timeless!

Now I need to find one for myself! Argggg! First a super 250 and now a Double Eagle 80!!!

Thanks guys for turning on the "yellow fever" !!!

:monkey:

 

[RandyMac]

That is nice looking saw! I really like the shape of them mac saws. It is really timeless!

Now I need to find one for myself! Argggg! First a super 250 and now a Double Eagle 80!!!

Thanks guys for turning on the "yellow fever" !!!

:monkey:

You are welcome Mike, we are here to serve the cause.

!-40

 

[Brian13]

Brian, if you were to measure the crankshaft very carefully you will find the Super 250 has a stroke of 1.500", the standard 250 is 1.375", hard to see .0625" difference in the throw when they are just setting there.

The Super 250 cylinder is on the left in your photo, notice the bigger "window" below the intake for starters, then if you look in the "third port" to the right of the intake, you may discover an extra hole as well.

I'm not sure is they changed the exhaust port(s) on the Super 250's, most of the 80/87cc saws have three open holes in the exhaust, some early saws have only 2 holes open, and I have one cylinder at home that I cannot identify that has one large oval opening and a sort of step in the exhaust port. The cylinder is equipped for a compression release like the 795/797 type saws but has (had) a chrome plated bore.

Mark

Exhauste ports look the same. Both 3 hole. I will look tomarow try to find the 3rd port see if there is any differance. Pretty simmelar overall.

 

[RandyMac]

 

[cpr]

Ok I had some time after dinner and here is a 250 side by side with a Super 250.

The 250 has dividers but everything looks the same in size.

Looks like the transfer holes "might" be lower to crank center on the Super also 2 more intake port windows into the crankcase at the bottom of the Super. Only way to tell is coil some paper in the bore tight to the squish band and rub out a port map with a pencil for both and measure. Might end a lot of speculation on "Super" porting. I need to re-ring (at least) my Super 797. When I get to it, I will port map it and if someone could do a 797 jug, we would know on those, too.

 

[Brian13]

Looks like the transfer holes "might" be lower to crank center on the Super also 2 more intake port windows into the crankcase at the bottom of the Super. Only way to tell is coil some paper in the bore tight to the squish band and rub out a port map with a pencil for both and measure. Might end a lot of speculation on "Super" porting. I need to re-ring (at least) my Super 797. When I get to it, I will port map it and if someone could do a 797 jug, we would know on those, too.

I should be able to do a port map tomorow. I havnt done this before but I need to practice. A port job will be my next project. I will do some more precise mesuring tomarow, when I get off work.

 

[cpr]

I look forward to it. I have the "PROJECT: Super 1-72" sitting here. My goal is to try porting an old Mac for max performance. I'm waiting on the "Prelude Block" to show up to begin, though. Seller didn't know what it was, but it appeared to be a complete 250 engine on ebay for $10... I'd rather butcher that than a good 1-72 out of the gate :monkey:.

 

[jnl502]

I have caught the yellow fever and it has been a while but down here there are none to be had. craigs list has some but to far to drive to get and it is hard to get people to ship. if any of u have any old mac's u are thinking of getting rid of please let me know. i would like a 10-10 or two and a larger one or two. they could be minor projects but no train wrecks. thanks
jnl

 

[Jacob J.]

J- I have two pretty decent 10-10s I could send your way and possibly a larger Mac. I have a couple of the larger carcasses I need to ID and I'll let you know.

Be careful on porting those Macs, those loop scavenged engines need to be ported differently than a more modern through-scavenged engine or a partial loop transfer engine. Directional intake and transfer ports need to be kept directional and most of the Mac engines already have a lot of intake time and area. One thing you can do on the third-port engines is remove the rib divider. This will give you a lot of additional intake but you'll need more carburetion to feed it.

 

[jnl502]

J- I have two pretty decent 10-10s I could send your way and possibly a larger Mac. I have a couple of the larger carcasses I need to ID and I'll let you know.

thanks JJ i have a few big mac part saws but no clew what they are but not enough to build anything
jnl

 

[cpr]

Be careful on porting those Macs, those loop scavenged engines need to be ported differently than a more modern through-scavenged engine or a partial loop transfer engine. Directional intake and transfer ports need to be kept directional and most of the Mac engines already have a lot of intake time and area. One thing you can do on the third-port engines is remove the rib divider. This will give you a lot of additional intake but you'll need more carburetion to feed it.

Well said. I plan on introducing a new thread to cover the build and lots of pictures and questions to go with it. I've begun exploring kart forums for more input, too, as well as offering up the $10 Prelude Block as a sacrafice to failure if this is a witch hunt...

 

[jnl502]

Well said. I plan on introducing a new thread to cover the build and lots of pictures and questions to go with it. I've begun exploring kart forums for more input, too, as well as offering up the $10 Prelude Block as a sacrafice to failure if this is a witch hunt...

there is a good 2 part video on u tube on building a cart motor from a 1-53 block. i think it wood make a killer chainsaw
jnl

 

[RandyMac]

I got this real nice Double Eagle 80 a few weeks ago. It came with
no bar and chain. I had the bar and I made up a chain for it.
It runs real nice. Thanks again BillG.

Pine Killer!!!!
That would be a total blast in 30-36 inch Pines, it would go them through as fast as you could think.

 

[abikerboy]

I have an old 1-50 thats in need of a carb, also a mid 70's 10-10, and a pro mac PM10-10S that I bought new in 1990. The 1-50 does not run until I can find a carb, but the two 10-10's are regular work saws.

 

[Urbicide]

J- I have two pretty decent 10-10s I could send your way and possibly a larger Mac. .

Can you get fries & a Coke with that Big Mac?


That's my idea of a happy meal.