MCCULLOCH The official McCulloch thread

[heimannm]

The CP125 is a pretty capable saw, that's Don Lane's (sawfun) saw with a 48" bar tackling a 48" diameter oak.



Mark

 

[lehman live edge slab]

The CP125 is a pretty capable saw, that's Don Lane's (sawfun) saw with a 48" bar tackling a 48" diameter oak.

View attachment 470552

Mark

My 090 cut well also but realize they’re not as fast as a 125 Mac but not way behind either. Sold the 090 because it was just to rough on the hands to use with no av for any length of time. Now I’m down to an 075 and 076 super for my big large mount stihls. No they aren’t an 090 but much nicer to run.

 

[Woodslasher]

Heck yeah Mr. D - awesome!

I figured 3 years was verging on a bit too long to just lap a clutch 'n' snug it down. Bugger is the clutch nut rounded off when I was installing it, but since the clutch is good and snug I'll worry about that later.

 

[Sloa]

Like woodslasher my saw needs a serious bite, had a taste but bar/chain not cutting straight so worked on it and changed carb to a 090. Rumbles . Have questions should have asked a long time ago. Does the filter get placed under the tank liner in a 797 ?. Finishing a grommet set up for fuel and want to get the run time it should have before done is done.
The other Question I have , is it all my gas cap allowing and causing the gas to continue to run through the carb and fill air box when off ?

 

[jacob j.]

Like woodslasher my saw needs a serious bite, had a taste but bar/chain not cutting straight so worked on it and changed carb to a 090. Rumbles . Have questions should have asked a long time ago. Does the filter get placed under the tank liner in a 797 ?. Finishing a grommet set up for fuel and want to get the run time it should have before done is done.
The other Question I have , is it all my gas cap allowing and causing the gas to continue to run through the carb and fill air box when off ?

If your airbox is filling with fuel, then it's likely the inlet needle not closing. It could be that the inlet needle lever isn't adjusted correctly or that something is holding it open. Old diaphragms can get sucked in and hold the lever down which keeps the needle open. The Mac gas caps originally had a check valve which allowed the tank to build pressure but disallowed a vacuum. So your gas cap shouldn't be an issue unless the needle is being held open. Of course, a lot of check valves in gas caps have rotted due to the passage of time so most saws aren't building much pressure in their tanks.

 

[Scott Kelsey]

Does anyone know of a source for the special socket/splined Mcculloch connecting rod bolts?

 

[hacskaroly]

Does anyone know of a source for the special socket/splined Mcculloch connecting rod bolts?

Do you have a part number or a saw that uses it that I can look up on an IPL to see what the part is?

 

[Woodslasher]

Does anyone know of a source for the special socket/splined Mcculloch connecting rod bolts?

You do need the special socket for the original Mac bolts. New nos bolts can be had as I have
found a few on ebay and keep a couple sets in stock. Terry Ives in Ca. uses allen head screws
with what he says better results as they don't break like the Mac bolts, But he is in the karting
world not the chainsaw world we are in. Not sure which screws he uses as I have never needed
them.

 

[heimannm]

The spline socket is 85584, there is also a "L" shaped wrench PN 85583.



Vintage Vixen was selling the "L" wrenches again recently under a new eBay name.

McCulloch 85583 Splined Wrench Chainsaw Go Kart Spline Rod Bolt Socket Tool Cap | eBay

Up for sale is aMcCulloch tool, part number 85583.

www.ebay.com

Mark

 

[heimannm]

Dan - the clutch nut is 3/8-24 just like the bar nuts. You can probably find them at your local hardware store or the next time you visit Lowes or Home Depot.

Mark

 

[Woodslasher]

Dan - the clutch nut is 3/8-24 just like the bar nuts. You can probably find them at your local hardware store or the next time you visit Lowes or Home Depot.

Mark

True, but in the other shop bay there are a few nut and bolt bins I could check first:

 

[Al Smith]

"Vintage Vixen was selling the "L" wrenches again recently under a new eBay name".( Mark )-----and she's selling them for around 50 bucks a piece for them . I have both the wrench and the socket .What I had done for a couple of people is cut down the head of a grade 8 socket head bolt to get the clearance on the stuffer . Nothing else I could think of would fit,low head, button head etc . I used "hollow chrome " bolts the toughest grade 8's I could think of at the time .

 

[Sloa]

If your airbox is filling with fuel, then it's likely the inlet needle not closing. It could be that the inlet needle lever isn't adjusted correctly or that something is holding it open. Old diaphragms can get sucked in and hold the lever down which keeps the needle open. The Mac gas caps originally had a check valve which allowed the tank to build pressure but disallowed a vacuum. So your gas cap shouldn't be an issue unless the needle is being held open. Of course, a lot of check valves in gas caps have rotted due to the passage of time so most saws aren't building much pressure in their tanks.

I have placed four different carbs on . Three of them have all consistently behaved the same, including the new 090 carb just bought new. I cleaned out cap and replaced valve and believe it to be working.

 

[jacob j.]

I have placed four different carbs on . Three of them have all consistently behaved the same, including the new 090 carb just bought new. I cleaned out cap and replaced valve and believe it to be working.

Then maybe the fuel line barb is leaking?

 

[Sloa]

Then maybe the fuel line barb is leaking?

No just a steady second and a half wait for a tear drop amount to come from the back. Thankfully saw sits with a degree back so doesn’t go down the manifold. I am just going to disconnect fuel line from tank after use if keeping gas in tank.
I had another question, fuel filter and placement. Does it go under fuel liner, my brain says no because it is there to protect tank from the weighted filter, just so much gas not able to be used confuses me.

 

[hacskaroly]

Does it go under fuel liner, my brain says no because it is there to protect tank from the weighted filter, just so much gas not able to be used confuses me.

I would guess that it would snake around the right side of the liner (circled in red) and the fuel filter would rest underneath it. This to me would seem to allow the filter to move around a bit, but not bang around the fuel tank and allow it to help maximize use of fuel in the tank rather than sitting on top and not being able to get to the rest without potentially putting the saw on its side.