Modifying an AM MS381 Cylinder to fit on a Stihl 440.

[Rich Fife]

I haven't been building too many saws, just tinkering around with the saws I have... swapped out the carb on the hybrid... it runs much better... maybe this weekend I'll toss it into some hardwood and video.

 

[srcarr52]

Sounds snappy. The 440 chassis really likes a 52mm bore.

 

[Rich Fife]

Sounds snappy.

Yeah, it's not too bad! I wish it was a couple pounds lighter though... that's my only complaint.... so far.

The 440 chassis really likes a 52mm bore.

Agreed, it definitely packs a nice little charge.

 

[Maintenance Chief]

I haven't been building too many saws, just tinkering around with the saws I have... swapped out the carb on the hybrid... it runs much better... maybe this weekend I'll toss it into some hardwood and video.

Looks pretty good to me!

 

[Rich Fife]

Looks pretty good to me!

It's a runner... might pull the 7 tooth and try an 8 or whatever the shop has available. I'm curious how a 460 or a 660 cylinder with a Husky piston would do on this chassis...
I'm comparing to the 381 cylinder.

 

[Rich Fife]

Well, $h!t happens... luckily, the cylinder was fine.
Pulled it apart, cleaned the cylinder and honed it... that plating is tough.

 

[Rich Fife]

She's back up and running....with a flat top 272 piston... it's MUCH stronger than before. 25" bar 3/8" full comp 063 chain.

 

[Wonkydonkey]

It’s sweet it’s back up and running and also It sounds very nice…….but. Yes …



But Your only cutting 16” or less wood.

Do mee a favour and make my xmas present ( make a vid of your saw buried to the dawgs in wood with that 25 inch bar)

Pritty please .

 

[smokey7]

I chuckled when he took all those logs to the shins trying to show his strong saw. A wild thing sounds mean tuned lean in little wood too

 

[Rich Fife]

It’s sweet it’s back up and running and also It sounds very nice…….but. Yes …



But Your only cutting 16” or less wood.

Do mee a favour and make my xmas present ( make a vid of your saw buried to the dawgs in wood with that 25 inch bar)

Pritty please .

This coming weekend maybe I can find some wood as big or bigger.

 

[Rich Fife]

I chuckled when he took all those logs to the shins trying to show his strong saw.

My shins are fine... The Saw has some decent power... but, it should as it's a 77cc saw.

A wild thing sounds mean tuned lean in little wood too

It's the only wood I have at the house... if I want to cut bigger wood I gotta drive 20mins to a buddies house. For the 1st heat cycle this will do. Lol

 

[Rich Fife]

Well, time for a Stihl cylinder.

 

[Maintenance Chief]

That's Dramatic!

 

[EFSM]

Was it aftermarket?

 

[Rich Fife]

Was it aftermarket?

Yes... CHINA

 

[Rich Fife]

That's Dramatic!

Yeah, Juuuust a bit over the top. Lol.
He said it was his favorite saw until it stopped running. Lol
I picked it up, pulled the rope heard what i thought was the piston hitting the squish-band, figured rod bearing weren't. NOPE.. thats tight like new... so, with nothing visible on the outside... I can only assume this saw ran so hard that it went into Pac-Man mode... Chomp chomp chomp
Though, it looks like it ingested a bit of junk... the filter was spotless but I did notice fine particulates inside the carb...
He's been running Amsoil 100:1. The plug is dark, had oil on the bottom side...

 

[lehman live edge slab]

H

Yeah, Juuuust a bit over the top. Lol.
He said it was his favorite saw until it stopped running. Lol
I picked it up, pulled the rope heard what i thought was the piston hitting the squish-band, figured rod bearing weren't. NOPE.. thats tight like new... so, with nothing visible on the outside... I can only assume this saw ran so hard that it went into Pac-Man mode... Chomp chomp chomp
Though, it looks like it ingested a bit of junk... the filter was spotless but I did notice fine particulates inside the carb...
He's been running Amsoil 100:1. The plug is dark, had oil on the bottom side...

How thin was the base after machine work was it just crap pot metal or that thin causing the two ears snapping off. Or piston got hot bound up and did the snapping?

 

[EFSM]

Yeah, Juuuust a bit over the top. Lol.
He said it was his favorite saw until it stopped running. Lol
I picked it up, pulled the rope heard what i thought was the piston hitting the squish-band, figured rod bearing weren't. NOPE.. thats tight like new... so, with nothing visible on the outside... I can only assume this saw ran so hard that it went into Pac-Man mode... Chomp chomp chomp
Though, it looks like it ingested a bit of junk... the filter was spotless but I did notice fine particulates inside the carb...
He's been running Amsoil 100:1. The plug is dark, had oil on the bottom side...

bad idea. I refuse to believe that oil is twice as good as anything else.

 

[Rich Fife]

H
How thin was the base after machine work was it just crap pot metal or that thin causing the two ears snapping off. Or piston got hot bound up and did the snapping?

Approximately .300". I can measure later.

 

[Rich Fife]

bad idea. I refuse to believe that oil is twice as good as anything else.

Imnot a fan of 100:1... then again, im used to 40-50:1. I know guys that run 100:1 without any issues.