McCulloch Chain Saws

[watsonr]

Give her a good squirt down the throat, they take a healthy dose for a prime.

 

[promac850]

When it stops pouring rain, (which we need that water) then I'll try priming the heck outta it and see if she'll start.

Now that I think about it, there is no way that my feeler gauge set has a .200" piece in it... that's almost a 1/4"...

I'm fairly sure that the ignition is set right. I'm going to try cleaning the plug real well and then priming it well like I mentioned before.

We'll see... it may simply be the plug acting up. My typical cleaning of the spark plug involves carefully bending the side electrode away from the center electrode enough to allow a small flat file to get in there and flatten out/shine up the center as well as square away/shine up the side electrode.

Done this to many spark plugs and it seems to help a lot. For some reason, I did not do it this time with the Champion J6J...

 

[rwoods]

Anyone have a muffler that will fit an 850? If not I may have to take a lesson from Ron and make an adapter to fit some older type muffler. The 850 is different from the smaller 10 Series, and different from the PM800 as well

Mark

Mark, the chamber of an 850 muffler is shaped different than a SP80 or SP81 (5 sided instead of 4 sided) and the reed set up is a little different but otherwise they are the same and will bolt up. I have the rusted (as in unusable) carcass of an 850 (with everything I believe except a spark arressor screen) that you can have if you want it for measurements/reproduction. I know there are NOS muffler parts out there but I am not sure about the main chamber or an entire kit. I just returned from a lunch hour trip to the scrap yard; I picked up a small sheet of SS to see if I can fab a cover for one of my SP81 chambers. Ron

 

[rwoods]

Mark, it looks like M&D may have an assembly but it is over $50. Scroll down to the McCulloch section of the page. M&D Mower -- Search results Ron

 

[promac850]

Before I get into the 790 too much, does anyone think a 1/4" in tank pick up line is too big? Could that be the problem?

While I wait for an answer, I'm going to refresh the spark plug and see if anything else looks wrong on the saw.

Still pouring over here... good thing. Been without a good rain for over a month.

 

[watsonr]

Before I get into the 790 too much, does anyone think a 1/4" in tank pick up line is too big? Could that be the problem?

While I wait for an answer, I'm going to refresh the spark plug and see if anything else looks wrong on the saw.

Still pouring over here... good thing. Been without a good rain for over a month.

Nope, as long it's able to fill the line and keep it full, it will work. Fill the tank full to help it, that is a pretty big line. If it pops and runs for just a second, prime it again.

 

[leeha]

Kyle, Pick up a new spark plug. That 790
takes a champion DJ8 with the tapered seat,
Not the J6J you have in it.




Lee

 

[promac850]

Kyle, Pick up a new spark plug. That 790
takes a champion DJ8 with the tapered seat,
Not the J6J you have in it.




Lee

That would explain the intermittent spark... it'll pop, but not pick up and run.

####ing spark plugs. Wish they would standardize a small range of them rather than 6 billion different ones.

This thing is starting to piss me off. I'll get the right plug tomorrow, and if it doesn't run then, I'm taking a ####ing sledgehammer to the saw. Just ####ing ridiculous.

 

[ozflea]

That would explain the intermittent spark... it'll pop, but not pick up and run.

####ing spark plugs. Wish they would standardize a small range of them rather than 6 billion different ones.

This thing is starting to piss me off. I'll get the right plug tomorrow, and if it doesn't run then, I'm taking a ####ing sledgehammer to the saw. Just ####ing ridiculous.

Now now take a little blue pill and settle down we dont need no nervous wrecks

McBob.

 

[promac850]

Now now take a little blue pill and settle down we dont need no nervous wrecks

McBob.

Nervous wreck? More like a real angry hotheaded person made more so from struggling to get something started because it likely has the wrong plug in it...

But supper will be done real soon. I've calmed down a bit.

 

[paccity]

it's ok . they just go suck - bang - blow. :msp_rolleyes:

 

[promac850]

it's ok . they just go suck - bang - blow. :msp_rolleyes:

You forgot the squeeze...

 

[paccity]

damn . thats why my saws won't run.:msp_biggrin:

 

[promac850]

damn . thats why my saws won't run.:msp_biggrin:

If an engine don't squeeze that mixture, nothing is gonna happen...

As for the 790, it has plenty of compression. I think it's the spark plug now, since Lee mentions a tapered seat plug is needed, not a washer and flat seat plug. While that will hold compression, it likely is a poor connection for the spark.

 

[little possum]

How are the seals Kyle. I had a C-72 Homelite that I rebuilt with new rings, carb kit, etc... Wouldnt run, but would backfire and shoot flames. Stumped me for a while, but the bearings and seals are wore slam out and it was sucking too much air

 

[Deer Camp]

Mac 10-10A RHP Guide Bar Plates?

Hi All,

I have a Mac 10-10A RHP that I recently replaced the chain tensioner on because the chain would loosen up after running for a few minutes. The chain is still loosening up so I checked the parts list and noticed I may be missing the inner and outer guide bar plates.

Did the RHP saws come with inner and outer guide bar plates and if so, could this be the reason the bar and chain are loosening?

Also, I have been searching for a NOS bar and found one that is 3/8 .58 gauge; however, the current set up is 3/8 .50 gauge. Can I run the .58 or do I need to change out the sprocket?

I have attached a few pictures of the saw to show the current set up.

Any help you can provide is greatly appreciated.

 

[Warped5]

Deer Camp - You have mail!

 

[promac850]

How are the seals Kyle. I had a C-72 Homelite that I rebuilt with new rings, carb kit, etc... Wouldnt run, but would backfire and shoot flames. Stumped me for a while, but the bearings and seals are wore slam out and it was sucking too much air

Seals and bearings are fine. I checked them very thoroughly and they didn't look or feel worn out. Spinning the crank on the bearings is smooth, seals are tight on the crank as well.

Now that you mention that, I did see what appears to be fuel on the bottom saw casing, under the cylinder. Very little, but there was some there. That might have something to do with it.

And it does not spit flames. I think that is more of an issue with me not pulling hard enough, or the spark plug firing a little off due to the flat washer seat instead if a tapered seat. I have heard that minor difference in plug design can cause all kinds of problems.

 

[heimannm]

The difference in the spark plug won't really affect the way it starts and runs, most in fact were intended the be able to operate with either type. The gasket design will form a complete seal, just make sure the reach is correct so you are firing in the cylinder and the plug will not punch a hole in the piston.

Ron - I have three different "bodies" but no cover. One has the spark arrestor screen so I will probably use that until I can get one whole muffler. $50 for a new one is high, but not unreasonable.

By the way, the 850 is now a runner. My compression gauge must be on the Fritz as this thing has very good compression but the guage only reads 120 PSI now. I can't wait to try this one along side my SP81 and PM800.

I will try to get photo's up tomorrow.

Mark

 

[RandyMac]

I'm betting the timing is off, the symptoms indicate too much advance.