McCulloch Chain Saws

[Eccentric]

Thanks for putting Mac, IHC, and a helicopter in one post Mark.

 

[heimannm]

Well I was drunk the day my mom got out of prison, I went to pick her up in the rain, but before I could get to the station in my pick up truck, I got run over by a rail road train...

 

[Toolslinger]

I got the idle down to what it should be... Took almost 2 full turns. High end sounds right, and it gives just the slightest hesitation from idle to WOT... Close enough for me.

So I cut something...

Yea, I know, it ain't much, but it was the only thing handy, and I can't exactly drop a giant log in my 1/8 acre yard to make a test cut or two... Hell, all the trees around me are just off my property, I just get to deal with their leaves... She'll get to cut something more appropriate once I get out to PA to deal with the trees that are the whole reason I got the saw...

Cheers!

 

[leeha]

Toolslinger, Thats a sweet 795L. Great saw.
Just back the L screw out a tad and that should
correct your slight hesitation. You may have to
go up on your idle a tad when you do.




Lee

 

[homelitejim]

sorry I forgot the pics of the 1-80, now don't laugh I thought it might actually have $5 worth of parts on it somewhere.

 

[Toolslinger]

Well... The dogs might still be ok...

Yikes...

 

[rwoods]

sorry I forgot the pics of the 1-80, now don't laugh I thought it might actually have $5 worth of parts on it somewhere.

Now that there is a part saw. :msp_thumbup: Ron

 

[promac850]

Speaking of dogs, I could use one (or both) for the 790...

I'd be tickled if they happened to be H&S, but will be happy with stock one(s) as well.

Does anyone know if the stock one offered on fleabay happens to have the hardware included? Just curious.

 

[dieselsmoke]

No, and no.
just 3 machine screws.

 

[wendell]

sorry I forgot the pics of the 1-80, now don't laugh I thought it might actually have $5 worth of parts on it somewhere.

Thank goodness for JB Weld.

 

[heimannm]

Bryce would get $15 for the flywheel...you did alright for $5.

Kyle, just three 1/4-20 x 3/4 FHCS with an internal star lock washer and you will be golden.

Mark

 

[mad murdock]

Well gentlemen, I will repent and post some helo pics tomorrow. No time to do it today, between reassembling the engine and installing a new computer DGPS swath guidance system, did not have time to get them on here. Tomorrow will be a better day. :msp_sad:

 

[Eccentric]

Jim that's a 1-70. A 1-80 is a gear drive. Both used the same engine (and their engines often have both "1-70" and "1-80" stampings). A 1-70 is basically the 'next' 87cc top-tank direct drive saw after a S-44A. I'd give $5 for the carb.

 

[homelitejim]

Jim that's a 1-70. A 1-80 is a gear drive. Both used the same engine (and their engines often have both "1-70" and "1-80" stampings). A 1-70 is basically the 'next' 87cc top-tank direct drive saw after a S-44A. I'd give $5 for the carb.

You know I didn't even look it up other than to see the displacement. The thing is only the 1-80 is stamped on the bottom, usually both numbers are stamped, that is why I didn't check more closely. I will be pulling it apart today to reduce its mass and I will see what makes it into the parts bucket.

 

[Overtrained]

S250 breakdown.....

I started pulling the S250 apart for a total overhaul. Looks like death but to my surprise the internals are in great shape. Planned on putting a set of rings in it so i broke it down completely. I have a few questions for the pros but let me post all the pics first.....

 

[Overtrained]

 

[Overtrained]

Alright........where can I get seals for this crank? The clutch side seal looks ok but the flywheel side is shot. Id like to replace both regardless. Bearings are in great condition however.

Also the coil works but it has cracks all over it if you look closely, prob from heat and age. Not to mention the plug wire is cut. Should I replace it or just run it?

 

[Eccentric]

You know I didn't even look it up other than to see the displacement. The thing is only the 1-80 is stamped on the bottom, usually both numbers are stamped, that is why I didn't check more closely. I will be pulling it apart today to reduce its mass and I will see what makes it into the parts bucket.

Whoever was in charge of stamping Mac blocks must've been a drunk. I've seen many misstamped blocks on Macs.

It is also possible that long ago somebody took a 1-80 and swapped on a direct drive saw oil tank, clutch, clutch cover, and other parts to make it a direct drive. That's happened before.When I asked for pics, I had a secret hope that the gearbox wasn't smashed (if it was a 1-80) since you'd already mentioned your intent to pull the engine for another saw. I have a 103cc 790 engine that I'm "someday" gonna use to build a gear drive once the right gear drive carcass/parts comes along (preferably a 640 or other auto oiler equipped GD). It's a low priority....

 

[promac850]

Back with a minor problem... ran the 790 today, and it'll start up and idle well. However, sinking it into this soft maple with a good loop of 24" chain results in the saw simply bogging down. Doesn't seem to change much with adjustment of the high side screw. Has very little power up top, it spools the chain right up from idle, though.

Is it the high side passage of the carb plugged up?

Oh, and the clutch nut came off twice. Then while I was working on it the second time, I dropped the crank key into the lawn. Took a while to find that little *******. I know, should've had a tray out there to set parts on.

 

[Eccentric]

Back with a minor problem... ran the 790 today, and it'll start up and idle well. However, sinking it into this soft maple with a good loop of 24" chain results in the saw simply bogging down. Doesn't seem to change much with adjustment of the high side screw. Has very little power up top, it spools the chain right up from idle, though.

Is it the high side passage of the carb plugged up?

Oh, and the clutch nut came off twice. Then while I was working on it the second time, I dropped the crank key into the lawn. Took a while to find that little *******. I know, should've had a tray out there to set parts on.

Something may be clogged. You're running the flatback correct? There's a check valve (or a sintered capiliary 'filter') under the big welch plug on those. It's acting like the H side is set too lean, but you say that adjusting the H side has no affect (so there could indeed be a problem with the high speed circuit). I have had zero luck with those flatbacks. Make sure you set the H side according to my sig line...

Clutch nut came off twice???