MCCULLOCH The official McCulloch thread

[heimannm]

McCulloch made a lot of their own fasteners so if someone decided a 10-24x11/16" slotted hex head screw was needed, they gave it a part number and made them. Generally speaking, their hardware was very good quality but the slotted, flange hex head screws (8-32 and 10-24) could be troublesome.

Mark

 

[Sloughfoot]

Definitely differently built than a 2100!!

No doubt. Mine are built within a couple years of each other and the 2100 isn't much different than saws 20-30 years newer and this 6000U 10-10 is stuck in the past .

 

[Sloughfoot]

McCulloch made a lot of their own fasteners so if someone decided a 10-24x11/16" slotted hex head screw was needed, they gave it a part number and made them. Generally speaking, their hardware was very good quality but the slotted, flange hex head screws (8-32 and 10-24) could be troublesome.

Mark

All of them were snug on this old saw and it doesn't look like it had ever been apart. I did see what looked like blue loctite on two handle screws.
Funny that the one hidden in the roof of the oil tank connecting it to the fuel tank for whatever reason had to be an Allen head with everything else slot head.

 

[hacskaroly]

All of them were snug on this old saw and it doesn't look like it had ever been apart. I did see what looked like blue loctite on two handle screws.
Funny that the one hidden in the roof of the oil tank connecting it to the fuel tank for whatever reason had to be an Allen head with everything else slot head.

Yeah, you get into a groove taking it apart with one tool and then they switch it up on you, in the end it takes 3-4 tools to get them all apart! I found that out with my R-P 1200B, thought someone had swapped out some pan head slots with socket bolts. I ended up getting the manual and nope, that is the way it came!

 

[Sloughfoot]

Yeah, you get into a groove taking it apart with one tool and then they switch it up on you, in the end it takes 3-4 tools to get them all apart! I found that out with my R-P 1200B, thought someone had swapped out some pan head slots with socket bolts. I ended up getting the manual and nope, that is the way it came!

My 1/4 socket is AWOL and that size isn't close enough to anything metric, so that 2nd set of the smaller case to cylinder bolts made me go shopping. Other than that it went pretty smooth. Case, cylinder and piston look good. Ring gap is larger than my largest .038 feeler gauge so I'll get new ones. With the loose rings it showed 130 psi.

 

[Squareground3691]

 

[cinci5]

ChatGPT version of Mark Hmmmm what do you think ?

 

[Sloughfoot]

View attachment 462440

What models of saw are those?

 

[Squareground3691]

What models of saw are those?

SP81,125,PM800 with a 850 exhaust, the original 800 exhaust was a terrible design,

 

[edju1958]

I picked up this Timberbear a little more than a yr.ago.It had some issues which I thought I'd straightened out,but I went to loan it out to my brother & it wouldn't start.I left it set all this time until a few days ago.The switch was bad,it was missing a thrust washer in the clutch drum,& it had a clang in it when I pulled it over.Originally I replaced the recoil & fan housing to get it operational last yr.I got it running again a couple of days ago.I did a compression test & it has 165 psi.The saw ran,then quit & I went to pull it over again & the pulley wasn't catching on the pawls.Pulled it apart & found the flywheel was loose.I tightened it down & the saw fired right up again (I don't know how),but it had an air leak,so I decided it needed a new crank seal.I pulled the flywheel to find the woodruff key had sheared vertically (strange!).I replaced the seal & woodruff key & it fired right up.I had to re-adjust the carb because it was no longer sucking air.It runs & oils gret now.

 

[Al Smith]

SP81,125,PM800 with a 850 exhaust, the original 800 exhaust was a terrible design,

To add to that most likely the best muffler is the one with a curvature at the bottom exiting straight out the side .Baffle optional ,mine have none .Presently I have a 805 with a complete early 850 engine and an sp-81 ,all stock .Plus nearly enough parts to build another 81 cc Mac .Not to mention two 125's

 

[heimannm]

Mark wishes he were as handsome and trim as that fellow...

 

[Sloughfoot]

SP81,125,PM800 with a 850 exhaust, the original 800 exhaust was a terrible design,

Was the original 800 exhaust a sliver about the size of a checkbook, like what's on 10-10s.

 

[Squareground3691]

Was the original 800 exhaust a sliver about the size of a checkbook, like what's on 10-10s.

 

[Rio95]

I finally managed to get my hands on an big mcculloch as I picked up this SP105 for less than $50 at an auction including the chainsaw cases behind it. I've been going through it, and it's easily the filthiest saw I've worked on so I've done a lot of cleaning. The saw is in pretty good shape under the grime other than a few minor missing parts and the piston and cylinder are perfect, but I can't get spark. I've changed the spark plug, cleaned and set the points, swapped the condenser to one from a Super 250 parts saw and I'm stumped. I occasionally get a small flicker when I spin it really fast with the drill, but nowhere near what it should be. I've got a multimeter, and the condenser seems to test fine, but I not sure what else I should test or look for? Does anyone have any pointers?

 

[hacskaroly]

I finally managed to get my hands on an big mcculloch as I picked up this SP105 for less than $50 at an auction

That is awesome to get that saw for $50!! Yes it is dirty, but should look good after a good cleaning! You probably already did this as part of your troubleshooting, but did you test with a new spark plug (or a known good one)? Gapped correctly? Are the ground wire ends clean and free of corrosion (on the saw too where it connects)?

Congrats on the saw!!

 

[Rio95]

Thanks, yes, surprised that it didn't get more bids, but lucky me, I guess.

I have tried 3 different spark plugs, 2 brand new, with no difference. Everything is clean now, but still no spark. Looking around a bit I put the multimeter from ground to the point wire and got 1.1ohms - not sure if that's good, but it's something. I got nothing (open) from the spark plug to ground, and even tried taking out the wire but still got nothing from the screw inside to the ground. Maybe the coil is dead?

 

[heimannm]

The secondary should be around 9K ohms, make sure your meter is on the correct range when testing.

Mark

 

[Bigmac]

Thanks, yes, surprised that it didn't get more bids, but lucky me, I guess.

I have tried 3 different spark plugs, 2 brand new, with no difference. Everything is clean now, but still no spark. Looking around a bit I put the multimeter from ground to the point wire and got 1.1ohms - not sure if that's good, but it's something. I got nothing (open) from the spark plug to ground, and even tried taking out the wire but still got nothing from the screw inside to the ground. Maybe the coil is dead?

What are you setting your points gap to? Are you testing to see if the points are opening and closing with a meter, have had worn lobs on the crank that wouldn’t allow proper functioning at normal specs, a chip is needed in thouse circumstances. If the coil is open and your not getting a reading I would say it’s your problem! I have had a few bad coils. Double check you air gap on the coil to flywheel too.

 

[Al Smith]

The points should be set at 18 thou . On a points type ignition the trouble will be on the low voltage side,the points and condensor .If you burnish the contacts use a piece of lens tissue ,printer paper or something to make sure a little bit of sand or something is not holding off making good contact .It doesn't take much to screw them up .They have to close and make conductivity else the system will not work .Mac coils seldom fail .If in doubt stick it in the oven at the lowest temp possible for a couple of hours .
My 105 looks almost like brand new .I found it on e-bay,cheap after sitting in a repair shop for 20 years waiting for a recoil .It's obviouly has plenty of power but it is a shelf queen I have other over100 cc saws to use if need be. Which is also seldom