McCulloch Chain Saws

[rwoods]

Stirring pictures Ron. Sorry my ?'s are interfering with your story.

Are there two SP125's in your car?

No apology necessary. If I hadn't asked questions here and gotten answers there would not be two SP125Cs in the car much less the two 82CC MACs in the back seat. Ron

 

[Eccentric]

Thanks for the comments. I didn't realize that the 790 did not have DSP. The saw picture on Acres' site shows a DSP lever.......

It will be awhile before I get down to the bore and stroke on this one. Good compression, and great spark, but the carb is giving me fits. I'll keep at it.

If you look real close at the "790" pic in the Acres 790 listing you will see that it sez 795 on the AF cover. It's a stock photo...

Don't feel bad about missing that. I'm far less observant. I was rattling on about Deprime's LH start 740frankensaw he just got while replying to your post. D'oh!:jester:

You shouldn't have to measure the stroke. Just remove the muffler and reach into the exhaust port with a popsicle stick until it rests against the far side of the bore. Keep it straight as you slowly run the piston up against it to mark it. Remove the stick and measure from the end to the mark. 2.165" (or thereabouts) means 99cc. 2.217" or close to that means 103cc.

 

[Mr. Bow Saw]

700 Series saws all have the pulse operated oiler, 740 and 790 with no compression release, 795 and 797's with the latching compression release.

My 740 and 795 both have the McCulloch flat back carburetor with primer. The Super 797 has perhaps a big SDC (not sure of the number) with an adapter to mate it to the larger flange.

Mark

The Super 797 with serial number prefix 13 had HL 103 E carb.
S 797 with S/N prefix 15 and 16 had SDC 19 carb.
795L with S/N prefix 10 and 11 had SDC 19 carb.

My S 797 has the SDC 19 carb.

 

[promac850]

What a mess.

For the record, I did not call mom stupid or disrespectful, the idea, yes... my mom, no. I was frustrated at the idea that she had of setting the part down on the floor. We here at home have resolved the issue. I don't see why everyone here has to make a big deal out of it. She said that it simply was in the way (my fault) and so she moved it. We have since moved on from this issue, as of last night after supper.

Yesterday was an 'off' day for half of my feeble brain. I could still get stuff done, but obviously stihl 440's bad day rubbed right onto me and the #### hit the fan in that Craftsman bar thread. I am prone to 'off' days under enough stress.

I fact, I left my supper on the stove and burned it to a crisp. Normally, I remember that I have stuff cooking and check on it, but my brain was lagging and I completely forgot about it. So much for supper.

If you don't believe me, fine. That's your choice. I wouldn't be surprised if some of you have done something like this somehow at one point or another, whether on the internet or in real life, older than I am or younger. I wouldn't give you crap about it. It happens, no one is perfect, as much as they wish they are.

I've been under a bit of stress because my barn is filled from wall to wall with stuff making it difficult to get around, my brother is graduating college today, I'm done with school and need to find a job, I've got a bit of a mess in the basement where I am cleaning some rifles, I'm worried about and praying and hoping for those that recently went through all of the storms and wildfires down south; I could go on and on.

I thought we were here for saws, not to judge someone by the cover of their book. I'm gonna have ####ty days just like everyone else. I am going to try as hard as I can, from this post on to do that five minute wait before posting as RandyMac suggested.

Sometimes, there is so much going on that I can't hardly think. I don't recall guaranteeing that I would not make a stupid post or the like, IIRC, I said I would try. From what I can remember, I am doing quite a bit better than when I first joined, and stopped plastering threads as much with unrelated off topic stuff. So much for thinking I was understood here.

CPR, if that guy doesn't give you your 101 soon, let me know. The 790 is still 'yours' so if nothing goes right, like it seems to be right now, I'll send it back. A few of the parts are clean now.

Ron, good work cleaning up. I'm glad you're okay from being hit in the head from a branch and that the other guy didn't get crushed by that tree. God bless you all.

RandyMac, you're right about kids being different nowadays. I'm just happy that I am not like those kids walking around with his pants halfway down his thighs smoking cigarettes and calling people obscene and bad names. I'm more respectful and decent than they are. There are a lot of kids like that around here.

If I met any of you at a GTG, you'd get a handshake and an introduction, just like I was taught to do, thanks to dad and mom, they both raised my brother and I to hold doors open for people and everything else that is mostly gone nowadays.

I have held the door for people that sneered at me and the simple gesture, did I slam it in their face because they sneered at me? No, I didn't. They just didn't know anything about or don't care about the gesture. If they started punching me, then I'd have a problem. Otherwise, I'm still going to hold the door open for people.

I apologize for me not being as perfect as you want. Everything I said or do, whatever, I apologize for it.

I waited about 6 minutes and revised this before posting.

 

[leeha]

First of all promac610
We here on this site DID NOT MAKE A BIG DEAL OUT OF IT.
You did. You were the one that copped an attitude with your
mother and expressed it here.
This is a chainsaw forum, Here we talk about chainsaws,
new ones, old ones, broken ones, rare ones, etc.
We are not here to discuss and councel you through your
lifes up's and down's.



Lee

 

[cpr]

I don't want it back. I gave it to you and expect to see it run in your hands. I want the monster!

 

[promac850]

First of all promac610
We here on this site DID NOT MAKE A BIG DEAL OUT OF IT.
You did. You were the one that copped an attitude with your
mother and expressed it here.
This is a chainsaw forum, Here we talk about chainsaws,
new ones, old ones, broken ones, rare ones, etc.
We are not here to discuss and councel you through your
lifes up's and down's.


Lee

Yeah, it's all my fault. My temper can get the best of me every so often. Let's forget about it.
-------------------------------------------------------------------

The cylinder/points side of the crankcase is quite clean now, will receive some carb cleaner and be thoroughly wiped down with a shop towel to remove the last of the crud. Not much left on there, anyone have a paint code and a recommendation as to what paint brand to use? I'm thinking I may repaint the saw, since the paint is coming off of basically everything.

Cylinder needs at least one more boiling process to clean more gunk off of it. For the most part, it is pretty clean.

Sorry about the randomness of me jumping from one project to another, got lots going on. I have some pics that I will try to upload into the 790 build thread tonight.

 

[leeha]

cpr, Was this 101 a private deal or ebay,
I sure hope your not out any money.
I was sure hoping to see the saw done.
Looks like i will have to get into high gear
and get my KILLER geardrive done to keep
us mac fans satisfied.



Lee

 

[dieselsmoke]

Ron, I'm glad to hear everyone is safe. It sounds like you had some "green" help out there.
That's always a chalenge on it's own to get the work, done while watching and keeping others safe. Also, I appreciate you taking the time to share with pics, of this event. Thanks.

 

[cpr]

cpr, Was this 101 a private deal or ebay,
I sure hope your not out any money.
I was sure hoping to see the saw done.
Looks like i will have to get into high gear
and get my KILLER geardrive done to keep
us mac fans satisfied.



Lee

Not ebay, it was a classified on a kart forum... I have full documentation of emails, calls, when and how my payment was sent, and when he cashed it. I don't want to get into it here, it isn't the place and should be dealt with between me and him.

I wanted to do this one first before I started putting together the alky/piped one, but at this rate I just might as well get after the other one. It's patiently waiting on a shelf...

 

[dieselsmoke]

But back to saws, My 740 has no model numbers stamped on the bottom. Once I stripped it down for cleaning, I measured the bore, 2.16?". No decomp, and no auto oiler.
My new to me, 790 has the "790" stamped on the block, no decomp, and has the auto oiler on the top of the oil res. I pulled the muff. for inspection and measurment, I got 2.218 thru the exhaust port. I guess i'm just to lazy to post pics, not enough coffee yet.

 

[leeha]

Not ebay, it was a classified on a kart forum... I have full documentation of emails, calls, when and how my payment was sent, and when he cashed it. I don't want to get into it here, it isn't the place and should be dealt with between me and him.

I wanted to do this one first before I started putting together the alky/piped one, but at this rate I just might as well get after the other one. It's patiently waiting on a shelf...

I completely understand.
Keep us updated on your projects.



Lee

 

[rwoods]

I hate pestering you guys with my petty questions but there is so much conflicting advice given in the general threads that most of my searchs are worthless to a novice like me. Although differences of opinion exist here too, I have found this thread to be very reliable and my hat is off to you for helping guys like me especially when you are answering the same question for the umpteenth time.

I believe I have solved my smoking PM800. I recently repaired the oiler and turned it up. It is throwing off a lot of oil which is ending up in the muffler "mod" a previous owner had made. I'll clean the bar and tinker with it some more. If necessary I'll put a sawdust flap on the guard.

Now to my perplexing question. I have a PM8200 which I had fixed up for my brother. It runs like my PM700 has always run except not as long. PM700 after one or two tanks of gas won't start. PM8200 after 1/2 to 2/3 of a tank won't start. I wrote the PM700 off to vapor lock as it boils gas constantly. PM8200 doesn't boil the gas; it just quits idling and then you can't restart it. It has a recent carb rebuild - my first ever (except for autos back in the early 70s). What should I be looking for or trying?

Thanks, Ron

 

[Jacob J.]

Ron-

Are the impulse passages on the intake block clear? No gasket material in the way?

 

[rwoods]

Ron-

Are the impulse passages on the intake block clear? No gasket material in the way?

I'll show my ignorance here. I'm not sure what you mean by "intake block". The impulse line runs from nipple to nipple (located below the carb and on the cylinder); the only gasket I am aware of is the carb base gasket. Are you speaking of something internal to the carb?

Ron

 

[Jacob J.]

Most saws in Australia look like that after an hour or so of cutting...

Mark

They have super-hard wood? Therefore dust instead of chips?

They also have a lot of ham-handed operators with calloused frontal lobes.

 

[Jacob J.]

I'll show my ignorance here. I'm not sure what you mean by "intake block". The impulse line runs from nipple to nipple (located below the carb and on the cylinder); the only gasket I am aware of is the carb base gasket. Are you speaking of something internal to the carb?

Ron

No, it's been so long since I've seen an 8200 I couldn't remember if it had an intake block or not. If it uses a pulse hose and the hose is good, then you should be looking at the fuel line and filter if you haven't already. Sometimes a saw will have a cracked fuel line and will stop sucking fuel after a certain point.

 

[rwoods]

No, it's been so long since I've seen an 8200 I couldn't remember if it had an intake block or not. If it uses a pulse hose and the hose is good, then you should be looking at the fuel line and filter if you haven't already. Sometimes a saw will have a cracked fuel line and will stop sucking fuel after a certain point.

Thanks. I'll check that. I can't remember if I replaced the line and filter on the 8200 or not.

To my knowledge, the Double Eagle 80 is the only 82cc MAC with the impulse line connected to a removable manifold. A set up I really like as it eliminates the intake boot. It does however require a seal between the manifold and the air box.

Thanks again, Ron

 

[Ambull]

Promac, yes your comments were off base, but you were a big enough person to admit you were wrong. That my friend shows a lot of character. Now lets all put it behind us.

 

[a. palmer jr.]

I'll show my ignorance here. I'm not sure what you mean by "intake block". The impulse line runs from nipple to nipple (located below the carb and on the cylinder); the only gasket I am aware of is the carb base gasket. Are you speaking of something internal to the carb?

Ron

Just a little confusion, I think. Some saws have impulse hoses, some have a hole in the carb base. I think he just meant is the impulse passage clear? I would rather think you might have had some dirt somewhere, either still in the tank, fuel filter or carburetor that may have worked it's way to the carb orfices...that or the coil might be opening up when hot.