Brian13
Addicted to ArboristSite
Got a pic. Sounds like the weep hole, main seal goes under that hole, and thinner seal goes above it. If I am at all understanding what your talking about.
Building a SP125C / 101B Kart Saw
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Got a pic. Sounds like the weep hole, main seal goes under that hole, and thinner seal goes above it. If I am at all understanding what your talking about.
ausneil 1
Addicted to ArboristSite
hahah,I have a soft spot for them as well and i'm not knocking them in any way or form, merely stating what some of our old timers have said to me who did work in our big timber in the 60's and 70's.
Even old Bill Boyd ( hardened mac man and lifelong professional log faller) said they were a top saw but they spent a lot of time in the workshop and his 090's hardly ever missed a beat. He gave me his entire mac collection from his working days which amounted to a lot of preloved stuff. I gave him a carton of tooheys old stubbies and he was satisfied.
ozflea
Good ol' BP Zoom 25-1
At least Bill will be happy
McBob.
McBob.
This cover may very well be from a SP125.
There isn't room for two of these seals.
Brian13
Addicted to ArboristSite
Yes that is the weep hole, iirc its to keep any oil out of the points. Should have one regular seal that sits just below that hole. And then one thin one that goes just above it.
Why two seals? I've never seen a saw with double seals. Is it necessary with these new seals?
Brian13
Addicted to ArboristSite
That is the only series I have come across that have 2 seals like that. I have always reused the outer seal, because the bearing store I go to doesnt have a match for it. If you can find one I would put one on, cant give you a yes or no as to if it is absolutely necessary. It was there when I took it apart so I put the same back LOL.
Dennis Cahoon
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Don't worry Brad.......those holes are there just to let the steam out......Hahahahahahaha!
The hole between the seals are to keep from forcing a seal out, under pressure. You need two seals.
The other hole is to allow fresh air to the points. For some reason, unknown to me, the points will not work when all the air is burned by the points. or at least won't work well.
The other hole is to allow fresh air to the points. For some reason, unknown to me, the points will not work when all the air is burned by the points. or at least won't work well.
ozflea
Good ol' BP Zoom 25-1
According to Terry, which I understand you can take to the bank, the outer seal is a dust seal needed to keep saw dust and engine oil out of the points. It's not needed on a kart. I'm assuming I can leave it out of this saw since it's running an Atom module, so no points.
watsonr
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There is a cover that goes over the points to keep out the saw dust. Guess it wouldn't really matter on a kart...your building a saw.
But the first one's not running points, so shouldn't need the seal. I've asked Terry for clarification on that point.
watsonr
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U could probably skip that seal and the points cover...however that slot in the raised area around the points holds a felt wiper. It would have soaked up any oil and does touch the crank to wipe it clean, I would not skip that part.
ozflea
Good ol' BP Zoom 25-1
Na still use both seals if you can get em
McBob.
McBob.
McC
ArboristSite Guru
Brian13, thanks for embedding my youtube video of me running my saw, and my cousin Paul running his saw. Mine is a mc92 in a 250 frame, .020 over with no mods to the ports. Running a mac v4 intake and a tilly hr carb. Pauls is a mc93 in a 250, pretty sure it's a mac v4, but he runs a tilly hl. They are very close in power. I usually have it set rich, don't want to stick it. Set rich it will make 3 cuts in a 10x10 in about 6-7 sec. This year I leaned it some and it ran much better and time went down to 5.7. Lots of fun to cut with.
ozflea
Good ol' BP Zoom 25-1
The 92 and 93 are good engines and i don't quite grasp why the 91b/1 gets going a bit harder i have one here and at 100cc and a bit of port work it kills a 125cc
The 91b/1 is an outstanding engine
McBob.
The 91b/1 is an outstanding engine
McBob.
T
Teddy.Scout
Guest
With the labor, prep, and actual material used to accomplish this,
(same as plastic with a micro layer of chrome)
Might as well gold plate it.
It is EXPENSIVE!
Looked hard at this when looking into options for a 090case.
ozflea
Good ol' BP Zoom 25-1
Lookin' good ol mate did you block off the origional decompressor valve ?
A saw with a flowing flag of stars and stripes over the fuel tank would look tuff.
McBob.
A saw with a flowing flag of stars and stripes over the fuel tank would look tuff.
McBob.
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