What saw's the best candidate for a MC91 engine?
McCulloch Chain Saws
- Thread starter Bruce Hopf
- Start date
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which macs does this fit ? my 1-71 uses a broader tailed bar. the chain rubs on the side plates with this one.
the slot is 3/8" wide
Just a guess but I would say PM800 series since it is narrow at the end?
Eccentric
Mister Wizard
If that bar has a 3/8" slot, it's either a 10-series bar (such as for a PM800 like Shane suggested) that has had the slot opened up from 5/16" to 3/8", or it's a "slim line" bar intended for the large frame McCullochs (such as your 1-71) when used with a set of special bar plates once sold by McCulloch (and maybe others) to allow it's use without rubbing. Guys have made their own bar plates for the same purpose (to use 'slim line' and 10-series bars on the big saws). Slim Line bars were an attempt at putting "lightweight" bars on the large, old saws. They are also what many of the the SP/PM105 and CP/SP125 saws were sold with....
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Eccentric
Mister Wizard
CP/SP125, just like with the 101's. If you use the non-AV top tank saws (such as a 790), you will run into serious intake restriction unless you cut out the intake manifold and carb box floor sections of the lower tank half. I have a 790 tank with a busted intake manifold flange that may someday get butchered that way for a 'kart saw' project, since it's useless in the stock configuration.
eccentric- i like the "slim line" version, makes sense. at 24" the bar is heavy built. it has a 3"+ beam and weighs 3+ lbs. it would seem light on the 1-71.
i was eyeballing it for the cp-55 'cause of the tip but it would really make it nose heavy. the 55's hardnose bar is narrower yet.
what material should i use for bar plates ? i noticed the large ones were spring steel when i tried to tweek them !
i was eyeballing it for the cp-55 'cause of the tip but it would really make it nose heavy. the 55's hardnose bar is narrower yet.
what material should i use for bar plates ? i noticed the large ones were spring steel when i tried to tweek them !
Eccentric
Mister Wizard
Since these plates aren't any wider than the bar and don't take abuse from the chain, I'd think that mild steel would work fine. I have a 24" bar on my PM700 (about the size of your CP-55), but it's a much slimmer 'modern style' D176 Poulan/Echo/McCulloch sprocket nose Windsor Speed Tip.
i'll look to the modern bars for the cp-55, don't know much about bar types, but do have some poulan echo spares around. the windsor speed tip sounds good.
found a pair of plates for a sp-125 on the bay, will have to check spacings.
found a pair of plates for a sp-125 on the bay, will have to check spacings.
cpr
Addicted to ArboristSite
I put one in a 790 chassis. It's easier than the 125, and not any more restrictive than a 125 through stock reeds. Plus you can fit the much larger 48890b flatback without hacking up the airbox. Actually, a 250 would be easiest. The small saws were designed for the 90 series engines, the big ones for the Super series.
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Brian13
Addicted to ArboristSite
I agree as well, Mc91 in a 250. I think the 250 would be the easiest to cut up as well to use a kart intake.
RandyMac
Stiff Member
And use an airbox cover from a Super 250, those portholes are worth .99 horsepower right there.
little possum
Crash and Burn
I like the sounds of a 250 with MC91. If going with a 790/125, might as well go with a 101.
fearofpavement
Trying them all
strange old mac on Atlanta CL Old Mc Culloch Chain saw
joeymt33
I bleed YELLOW!
whatscooking
ArboristSite Operative
Help with a 300
Hellow, while checking different places for old saws i have found a 300 that is complete but has no spark. Since i don't have any yellow saws in my collection i am undecided on wheather to keep it and get it running or trade for something i know, are these saws sought after by the McColloch collectors?
Hellow, while checking different places for old saws i have found a 300 that is complete but has no spark. Since i don't have any yellow saws in my collection i am undecided on wheather to keep it and get it running or trade for something i know, are these saws sought after by the McColloch collectors?
RandyMac
Stiff Member
A 300 is a good example to have if you want only one McCulloch. It is 87cc, does all things McCulloch, parts are not hard to find, not hard to work on.
8433jeff
Aftermarket connoisseur
Who in the heck would want only one?
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