Mark, what size wood are you guys cutting? I'm curious about the 250 beating an sp81, I would have never thought that'd happen.
McCulloch Chain Saws
- Thread starter Bruce Hopf
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tricky50
ArboristSite Lurker
joeymt33
I bleed YELLOW!
If the 250 was a standard and not a "super" model, I also find it hard to believe that it would beat a sp81. If the 250 was ported with a square grind chain, then maybe. That's just my experience though, I've had the super 250 and regular 250's and 300's, 380's. They wouldn't hang with any of my 82cc macs. Now that doesn't mean that I could hang in the 5cube class in baraboo. I'm just stating my experience.
tricky50
ArboristSite Lurker
Mark,
I just got a mini Mac 140 running & working on a 110. It's in excellent shape and probably frustrated several
other people before they gave up on it. I don't have spark so I replaced the coil,condenser,flywheel & checked the
points. The on & off switch is good and so is the spark plug. The coil air setting is exact. Where else should I look?
I enjoy your postings!
Thanks in advance
Rich
I just got a mini Mac 140 running & working on a 110. It's in excellent shape and probably frustrated several
other people before they gave up on it. I don't have spark so I replaced the coil,condenser,flywheel & checked the
points. The on & off switch is good and so is the spark plug. The coil air setting is exact. Where else should I look?
I enjoy your postings!
Thanks in advance
Rich
joeymt33
I bleed YELLOW!
Do you have the three insulated washers on coil screws? Also, do you have the three insulating sleeves for those same three coil screws?
joeymt33
I bleed YELLOW!
Also, try a couple more spark plugs.
If all of those did check out (make sure the points are nice and clean), is the flywheel key sheared? Or, is a piece of bare wire grounding the circuit out somewhere? Those coils are pretty good, I've been through hundreds of those saws and only seen one bad points coil, and can probably count the amount of bad condensers on one hand.
Looking back through the photos, I see he also beat Bill G in 2011 running a PM800. Let me assure you that Scott's 250 is a strong, fast saw.
2013
2012
2011
Square ground chain is only allowed in the hot saw class. Scott does know how to sharpen a chain, as well as how to run a saw. I would suggest you schedule something to take you near Wisconsin the third week in August and experience it for yourself.
I figured with an SP81 in good shape I should have been competitive, but the last two years in a row my 82 cc 10 Series were badly beaten like Bill's 800 in '11. I will make sure I have a good bar and good sharp chain for 2014 to try and improve on past poor performances.
Mark
2013
2012
2011
Square ground chain is only allowed in the hot saw class. Scott does know how to sharpen a chain, as well as how to run a saw. I would suggest you schedule something to take you near Wisconsin the third week in August and experience it for yourself.
I figured with an SP81 in good shape I should have been competitive, but the last two years in a row my 82 cc 10 Series were badly beaten like Bill's 800 in '11. I will make sure I have a good bar and good sharp chain for 2014 to try and improve on past poor performances.
Mark
joeymt33
I bleed YELLOW!
I should send my latest sp81 for you to take if I can't make it. Seriously, I may send it up to you.
54stude
ArboristSite Operative
That is me wearing the packer hat in the 2012 picture, and I can assure you that if you heard the 250 in question run, it would not surprise you that it finishes well. I have heard that the porting on the 250 is a lot hotter than a 1-4x series or 200 series 80cc mac. Also, there is nothing restrictive (or quiet) about the stock 250 mufflers.
joeymt33
I bleed YELLOW!
Is that saw stock? Or has it been modded? Maybe it's got a super 250 motor in it?
I have not had any ignition issues with any Mini Macs, but I did have one 10 Series that I could not get to work without changing out the points.
I don't understand the purpose of the insulators that mount the coil, but I don't think electrical insulation is the point since the coil is grounded with a wire like all others. Check the points for continuity when they are closed, and make sure the circuit is broken when they open. Search other threads for diagnosis of point ignition problems, perhaps something will become obvious.
Joey - You will have to come up with something better than a snowmobile, I happen to know you don't have much snow in your area.
Mark
I don't understand the purpose of the insulators that mount the coil, but I don't think electrical insulation is the point since the coil is grounded with a wire like all others. Check the points for continuity when they are closed, and make sure the circuit is broken when they open. Search other threads for diagnosis of point ignition problems, perhaps something will become obvious.
Joey - You will have to come up with something better than a snowmobile, I happen to know you don't have much snow in your area.
Mark
Scott reports the only non stock item on the saw is a chip in place of the points.
Mark
Mark
Mark-
Got any videos of this 250 running?
Got any videos of this 250 running?
joeymt33
I bleed YELLOW!
Mark, I meant, send that snowmobile engine up here. I'll find a good use for it.
Seriously, I couldn't afford that bp399 and the cost of making a kart. I'm not brave enough to make a hot saw. And I'm not creative enough to come up with other ideas for a 17k RPM balanced piston twin cylinder beast.
Seriously, I couldn't afford that bp399 and the cost of making a kart. I'm not brave enough to make a hot saw. And I'm not creative enough to come up with other ideas for a 17k RPM balanced piston twin cylinder beast.
54stude
ArboristSite Operative
17K? We scratched 22,000 at the GTG last month...don't plan on doing that very often though.
Mark
Mark
ethar
ArboristSite Operative
You have way more patience than me mark. The mini Macs are one of those saws you dread having on your bench. I have a motor from one bad fuel line decided it wasn't worth my aggravation.
joeymt33
I bleed YELLOW!
Wow, that's quick. I'm a little worried
The Mini's with a removable starter are no trouble to work on. The originals require you align the fins on the flywheel with the starter clutch and snake it all together. It is possible, but that task does test your patience.
If you put the engine in without the fuel/oil tank, connect the throttle, then work the fuel line together they are not so bad. McCulloch intended the fitting to pull out of the tank when the saw was disassembled, then you were to hook the fitting through the slot in the bottom of the housing to hold it in place when the tank is pressed on to the oil and fuel lines. It works, but I am always suspect when putting them together.
Mark
If you put the engine in without the fuel/oil tank, connect the throttle, then work the fuel line together they are not so bad. McCulloch intended the fitting to pull out of the tank when the saw was disassembled, then you were to hook the fitting through the slot in the bottom of the housing to hold it in place when the tank is pressed on to the oil and fuel lines. It works, but I am always suspect when putting them together.
Mark
