joeymt33
I bleed YELLOW!
There is a sealant used when installing those bushings. You may have to punch it out and reseal it with some fuel tank sealer.
McCulloch Chain Saws
- Thread starter Bruce Hopf
- Start date
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ethar
ArboristSite Operative
Joey like the half kart half chainsaw models of the 60's and 70's or the partner/mcculloch monster. I don't know who was the lead design over the years but whoever it was made some definite frankensaws. But you gotta consider Mac was at the top of the industry for years so it worked for them. I'm not 100% but Mac did partner with quite a few other manufacturers to come out with some hybrids.
machinisttx
Addicted to ArboristSite
48" on a 60cc saw? Did it at least have full skip on it?
OldDeadWood
ArboristSite Operative
joeymt33
I bleed YELLOW!
And a side of mini Mac bites.
Got my SP125 running today. Still runs pretty fat on the top end. I'm going to get a carb rebuild kit. It has a Tillotson HS124A in it and I'm not sure how to adjust it.
Tried multiple times to post video to no avail.
Tried multiple times to post video to no avail.
Last edited:
joeymt33
I bleed YELLOW!
I think those carbs have a fixed high jet. The one and only adjustment screw is the low adjustment. You could get a walbro SDC-20 which would be a direct swap and have an adjustable high side.
joeymt33
I bleed YELLOW!
You're welcome, great saw you got there.
joeymt33
I bleed YELLOW!
I'm not sure about replacing just the jet. I would think you could.
I would just get the SDC 20 and make it tuneable. <---is that a real word? Or just an Alabama word? Anyway, tune that a little rich and put a long bar on it so you can make it work.
I would just get the SDC 20 and make it tuneable. <---is that a real word? Or just an Alabama word? Anyway, tune that a little rich and put a long bar on it so you can make it work.
Eccentric
Mister Wizard
You can indeed change the high speed jets on the HS. Here's the jet list from the SP125C IPL. Not sure how easy those jets are to find. You can also affect the high speed operation with the L speed needle setting. It only does so much however.
Getting an SDC20 would be simpler from a tuning perspective. Guys aren't in a hurry to get rid of those however. May take a while to land one....
joeymt33
I bleed YELLOW!
Well then at least get a .404 8 tooth sprocket and and bury it. It's just begging to be worked.
Thanks for the info. I spend 20 years tuning 2 stroke dirt bikes and snowmobiles that required changing jets. The low speed jet did lean things out and sped the saw up, but that just resulted in lower performance when it was loaded a little bit. I'll keep my eye out for that carb. There's no real hurry to get this saw running. I have another project starting next week.
Eccentric
Mister Wizard
I've never tach'd them. Just tuned them by ear in the wood. They need fuel to make power and stay alive.
joeymt33
I bleed YELLOW!
If I had to guess, 7500 to 8500. But like Aaron said, I've never tached one and i actually own a $100 non contact tach and I've had a sp125. Don't go off what I said, it could be out if that range. That's just a guess from running them.
joeymt33
I bleed YELLOW!
Maybe Lee will enlighten us soon. He has forgotten more than i know about the Big Macs.
ethar
ArboristSite Operative
I've got an old Mac 380 and when it is running at all I know it's gotta be hitting atleast what your guessing there Joey. Only thing I can't understand I've cut with a few 250's and some bigger saws they feel like the cut slower than my 10-10 or 610.
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