Stihl 044 advice

[Adirondackstihl]

How can you tell a 10mm slant fin cylinder from a 12mm slant fin?

The 10mm cylinders taste sweet.
The 12mm cylinders taste salty.

 

[huskyboy]

I believe the serial number as @Adirondackstihl mentioned, and mine has metal tag red choke lever

 

[junkman]

Measure the piston pin

 

[Canadian farm boy]

Measure the piston pin

Thanks Brian. Lol

I'm talking about just the bare cylinders. Is there a way to tell the difference?
Casting numbers? Cooling fins?

 

[maulhead]

Canadian farm boy, post: 352949, member: 309"]How can you tell a 10mm slant fin cylinder from a 12mm slant fin?

You can't. I think a 10mm slant fin is the same cylinder as a 12mm slant fin.

Its my understanding they were using up left over inventory/stock on hand and the early 12mm saws had angle fin cylinders on them.

 

[Canadian farm boy]

Thanks @maulhead. That does make sense. Automotive industry does this sort of thing all the time.

 

[junkman]

I think someone said the ring pins on a 12mm piston are further apart than the 10mm ,maybe that's why the early 12mm ones had an A piston and the newer ones a B piston or a/b fit piston ,i am just brainstorming though ,i could be wrong .

 

[junkman]

Thanks Brian. Lol

I'm talking about just the bare cylinders. Is there a way to tell the difference?
Casting numbers? Cooling fins?

I have never seen a ks on a 12mm saw ,those i would call 10mm jugs ,i would say mahle with 4 or so ++++ marks could be a 12mm jug

 

[GeorgiaVOL]

This is all very interesting. Now I want to check all of mine and see what they are.

 

[junkman]

second image can see the ks logo ,the 3rd image is the top of the mahle one

 

[dall]

ive had a few of the slant fin stihl cylinders from 10mm saws the one i have here now is a 127 serial number i sent one to @T.Roller and one to @huskihl kevin

 

[huskihl]

ive had a few of the slant fin stihl cylinders from 10mm saws the one i have here now is a 127 serial number i sent one to @T.Roller and one to @huskihl kevin

Yep. The one I got from you was a mahle 10mm slant non decomp.


1) Are there any 10mm with decomp?
2) Are there any 12mm non decomp?

 

[leadfarmer]

Yep. The one I got from you was a mahle 10mm slant non decomp.


1) Are there any 10mm with decomp?
2) Are there any 12mm non decomp?

Yepper I gots a 12 mm slant no decomp. Atleast that was what was on the saw when I got it. Still has the plastic on the metal badge. It resides in a box cause a 046 now lives on top of her [emoji38]

 

[junkman]

Decomps only on straight finned ones ,the early ms440 had a non decomp strait fin ,there is a ported early 440 jug for sale right now on the site.

 

[lwn9186]

Handy this came up. Chatting with Ted, big t double about an nos piston and cylinder I have for an 044. May be sending it down the road. Has a 12mm piston but looks like the oe 10mm I have here has the pins in the same place.

Sent from my iPhone using Tapatalk

 

[lwn9186]

Here is the base of the cylinder.

Sent from my iPhone using Tapatalk

 

[wcorey]

View attachment 62672
second image can see the ks logo ,the 3rd image is the top of the mahle one

130986337 has the Mahle like the third pic.

 

[Basher]

You can't. I think a 10mm slant fin is the same cylinder as a 12mm slant fin.

Its my understanding they were using up left over inventory/stock on hand and the early 12mm saws had angle fin cylinders on them.

True that. On my rebuilds I had two saws,one 10mm made just before the changeover and a 12 mm made just after the changeover, both cylinders have the same 6 + symbols on them. Both saws had been straight gassed within the first week of service so I bought new slant fin cylinders for them both plus one more to have as a spare. Next time I needed a cylinder they had gone to the straight fin style.

 

[GeorgiaVOL]

Here are the 3 different cyls I have.

 

[drf256]

The best running saw will be the one with the best numbers at the best squish you can get without machine work.

The 10mm saws have a lighter and weaker crank/rod. There's a reason Stihl changed the pin size, it wasn't to waste money as a corporation. The 10mm have a cult following because they did run better than the 12mm from the factory. Was it EPA rules? I'm not sure. I haven't heard of many failures though.

The 12mm saws have wider ports and the piston has wider skirts. Putting a 10mm piston in a 12mm jug can/may freeport or catch a ring. The 10mm Meteor piston has the same skirt widths as the 12mm Meteor and oem piston, but the pin bosses are too far apart-this allows for side to side movement of the pin bearing. Freaks some guys out, but I haven't heard of a failure. I believe a meteor 10mm slug will allow any jug to be used on a 10mm crank.

Personally, I'd sell the 10mm slant fin jug to someone because it's worth more. I'd pic the decomp jug because I'm getting older and I like a decomp now. I have a feeling in a few years, I'll like the decomp even more.

One of the best running 044/440 I have ever done was a straight fin decomp jug with no porting at all. I took .010 from the chamber and then cut the base for an .020 squish with base gasket. Added a flywheel side deflector and advanced the timing by .025 of the key. I didn't time the jug but I sure wish I had.

You can get someone here to do that machine work for very little cash and do the muffler and advance yourself.