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MS290man

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Here's the MS271 I bought off eBay. PO straight gassed it. Doesn't even look like it was used to cut anything. Cylinder was salvageable and I scored a new OEM piston off eBay as well (bought before I disassembled the saw). Rebuild was going well until I noticed the piston looked different than the one that came out. Got on the board here who helped me to realize that I actually had a newer version and that they had changed the internals. So it sits here waiting for the new, correct piston to show up at the dealer; 2.5 week back order.

So I went ahead and replaced the cylinder and piston on a MS250 that I had previously got running but only had 110 psi compression. 170 psi now...

PISTON IS IN THE HOUSE! Guess what I'm doing this weekend? Woohoo!
 

Tor R

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Do you have any pictures of the 242 ports and transfers versus the 42
not the best pictures, but here you go (the best way to double check fast if it's one 242 jug or not is to look after the cut in the transfer bulge):
new 242 Mahle, 42 special year 92, 42 special year 97
_DSC3439.jpg

Intake difference:
42 special to left, Mahle 242 to the right
_DSC3441.jpg

Didn't take exchaust pictures, but biggest difference is timing (242 may be bigger also)

Very few know, something that isn't named in Huskies 42 IPL's, but there was two different piston (the one with more skirt is from 42 special year 92):
_DSC3440.jpg
 
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Chainsaw Jim

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Nice work! As far as my experience goes, those transfers are the reason they are unbelievable milling saws. See the same transfer design in the 144,152/3 & 166.

Put a step into the exhaust?

What is the bar fitted? Looks awesome!
I appreciate the compliment.

I would think the 42mm stroke would be the reason it may be favored for milling.

It already has a step in the exhaust floor from the factory.
 

Iron.and.bark

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I appreciate the compliment.

I would think the 42mm stroke would be the reason it may be favored for milling.

It already has a step in the exhaust floor from the factory.

Good work is good work, and it is great to see interesting saws like this. :)

You would assume that it is stroke and quite rightly so.

It is a pity the 143 has only a 40mm stroke, it has transfers more like a stihl. At 95cc doesn't even touch the load a 144 at 90cc carries.

The 144 at nearly 30cc less mills slightly slower but as easily as an 084 (next time I get an 084 will have to do a comparison video too a 153 I think). 084 has a 43mm stroke... 42 on a 144. This is with a 42/44" bar setup. Just holds it's rpm and keeps chugging along. Milling stuff a lot harder than pine though, pretty sure a softer wood would see a bigger speed/time gap in favour of 084.

As I said before, the cylinder design is like an old Villiers. For 2 stroke standards, these were torque motors.

My appologies, don't mean to lecture :) this stuff just interests me.

Sorry I ment did you enlarge the step, was a lot of room and seems to have worked well for me.
 
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