old stihl MS 260 clutch drum needed

Phil

Phil

Carpal tunnel level member
Location
Oak Lawn, IL
I have a couple MS 260 chainsaws that are missing the clutch drum. Part Number is 1121 160 2900. Can't find one anywhere. These are shallower drums that don't have a notch for the oil pump arm. If anyone has one or two they'd be willing to sell me I would be grateful. If not, my question is: do you think I could take the newer, deep style drum that has a notch and mill in shallower to meet the depth of the drum I need?

Thanks for any input. These saws work and I would like to actually use them, not just have them sit for parts.
 
Have you looked at Oregon 100791X. These guys say it it is compatible. I have one sitting here that I had on a 271 at one time, but for $25 you could just get it new. I don't think having a notch is an issue for saw that don't use it.

loggerchain.net

100791X Oregon chainsaw saw sprocket fits Stihl MS 260, 270, 024, 026, .325 pitch

100791X Oregon chainsaw saw sprocket fits Stihl MS 260, 270, 024, 026, .325 pitch It is .325 pitch 7 teeth. No bearing included. It fits Stihl 024 AND 026 after serial # 25809074 and MS260, MS260 PRO, MS 270, MS 270C That use .325 pitch bars and chains. Older style drives oiler gear by sprocket...
loggerchain.net loggerchain.net
 
Oh FYI. If you go to the Oregon, I'm not 100% sure if the old Stihl rim sprockets will mate up to the Oregon drum, if that's a concern.
 
Birdyman88 said:
Oh FYI. If you go to the Oregon, I'm not 100% sure if the old Stihl rim sprockets will mate up to the Oregon drum, if that's a concern.
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that part won't work, it has the notch and is too deep.

I'll poke around more for parts oregon offers but this is a tough problem to solve.
 
Phil said:
that part won't work, it has the notch and is too deep.
Click to expand...
Assuming the depth was correct, is there some reason you know of that having a notch is a problem? I don't think it matters.

As far as depth, just curious if you have tried one with a deeper depth to verify it won't work? I have the Oregon part here if you need some measurements.
 
Birdyman88 said:
Assuming the depth was correct, is there some reason you know of that having a notch is a problem? I don't think it matters.

As far as depth, just curious if you have tried one with a deeper depth to verify it won't work? I have the Oregon part here if you need some measurements.
Click to expand...
If it's the same depth the notch shouldn't matter I would think. I'll pull one of the working saws apart to get a measurement and get back to you for a comparison to the Oregon drum you have. That would definitely be helpful to know for sure.
 
Working in shop today, so here you go. Oregon 100791X that spent some time on a MS271.

This is probably the measurement you really need, from the inside to edge
0824221035.jpg
From outside to edge
0824221037a.jpg
Overall diameter
0824221039.jpg
Spline measurement
0824221040.jpg
 
@Phil I was just taking a look at the 11211602900 oem part that you're looking for. I noticed that the top of part where the spline is has a pronounced bell. The effect appears to be that the side walls where the clutch engages is thinner. But the overall measurement from outside edge of sidewall to inside edge where shaft goes through drum might actually be the same as the aftermarket with notch. Unless there's some reason that pronounced bell shape is important, the deeper sidewall may work just fine. On the first picture I posted in the previous post - that measurement is the same all the way across inside of drum. My drawing of the oregon shows a slight bell efect - but on the inside it's the same measurement all the way across because of some extra metal around shaft hole. Hope that makes sense.

0824221418.jpg
 
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Birdyman88 said:
@Phil I was just taking a look at the 11211602900 oem part that you're looking for. I noticed that the top of part where the spline is has a pronounced bell. The effect appears to be that the side walls where the clutch engages is thinner. But the overall measurement from outside edge of sidewall to inside edge where shaft goes through drum might actually be the same as the aftermarket with notch. Unless there's some reason that pronounced bell shape is important, the deeper sidewall may work just fine. On the first picture I posted in the previous post - that measurement is the same all the way across inside of drum. My drawing of the oregon shows a slight bell efect - but on the inside it's the same measurement all the way across because of some extra metal around shaft hole. Hope that makes sense.

View attachment 83274
Click to expand...
So I don't have a digital caliper tool like you have. My measurement is based on using a tape measure but was pretty accurate I think for the comparison.
The depth of my drum is only .5" This measurement is from the bottom edge to the underside of the bell surface. Its quite a bit shallower than the oregon part you have.
Inked20220825_082737_LI.jpg


Hears a couple more pics just o show the overall profile and contours of its construction.20220825_083100.jpg
20220825_082733.jpg
 
Phil said:
The depth of my drum is only .5" This measurement is from the bottom edge to the underside of the bell surface.
Click to expand...
So you measured from point 1, where the drum physically stops on the shaft? Here's both mine and yours for comparison. The OEM has that little recess, so just wondering if that will measure out to same as Oregon. May not, but you see where I'm going. When I used my tape and measured depth using points 1 and 2, I got 5/8" exactly.

Inked20220825_082733.jpgInked0825220927.jpg
 
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Have you checked with your local stihl dealers? Mine has a pretty good amount of parts saws from stuff that wasn't cost effective to repair, and I've gotten multiple parts for free from them. I do spend enough money there that they know me well, so that covers the free part but still available to whoever for a small price.
 
The made 2 different style clutch drums for 260. One is thinner and with out a notch for the non adjustable oil pump which i believe you have. Part #
  • 1121 007 1001
    Rim sprocket kit 0.325" 7T
The thicker one with a notch is for the adjustable oil pump 260 pro for example.
 
jmester said:
The thicker one with a notch is for the adjustable oil pump 260 pro for example.
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That's what I read too and that's what the Oregon part mimics. There was somebody on another site that said the adjustable oiler drum could be used in place of the non-adjustable oiler drum. IDK.
 
jmester said:
I dont know on the oregon drum. Could be worth a shot if the price is right and could be returned if wrong. May have to email tech oregon for sure.
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I would honestly consider getting the cheapest one I could get and putting it a drill press and filing it down to the right dimension ;) The bitch of going to Oregon, while inexpensive, is rims aren't interchangeable with Stihl rims in case that's an issue.

@Phil I have to laugh at the whole thing, Stihl says 1121 160 2900 isn't even a valid part in their database even though you know it exists. I guess you have to get it part of a kit. But, the kit number they gave me for the 260 shows that it has the deeper drum with notch :ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:
 
jmester said:
dont know on the oregon drum. Could be worth a shot if the price is right and could be returned if wrong. May have to email tech oregon for sure.
Click to expand...
Oregon tech service said the 100791X fits the 260, but they could not talk much about the saw being adjustable or non-adjustable oiler. The problem is that they said Stihl calls for the same part number on the 260 and 260 Pro, and they know nothing of their being a different part available :ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:
 
Rim drums are not sold individually threw stihl you have to buy the kit. Part # 1121 007 1001.

Buy the time you sand down the oregon drum if it is deeper. Did you really save any money if your time is worth money. IDK.
 
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