Mastermind Meets The Stihl MS441CRM

[sgrizz]

opcorn:

 

[HittinSteel]

Nice of you and your family to help out those victims.... I imagine it just comes naturally for you and you've instilled those values in your family.

oh, also interested in watching this saw progress

 

[Mastermind]

Cool.

You just don't ever stop do you Randy?

Nope..........not till I have too.

Suscribed

Would like to see before and after vids please.

Of course there will be before and after videos. I've been waiting for awhile to get started on this build. This saw has been on the shelf waiting on that muffler for three weeks.

??? There should be a "Wing" topped screw holding that air filter to the air baffle. Not a traditional "wingnut" like the older regular 441's use to have, and two nuts holding the air baffle to the carb?

I have never seen a regular steel muffler on a 441 CM before, ours have always been Stainless Steel Mufflers. Thats different. Keep an eye on if it is "tuned" different, electronically from the factory or not from the stainless one.

Sam

Thanks Sam, that's the way it is. I was just missing the two nuts that hold the baffle on.

The "tune" won't really matter as the saw will be modded anyway. I'm just curious how far one can go on these before the auto tune can't supply enough fuel. I know Terry built several, but I can't find any info on enriching the metering system on the M-tronic.

The auto tune 562s that I build more than compensates for the mods. I am thinking that as long as the venturi isn't enlarged the low pressure signal should be strong enough to pull plenty of fuel. If the venturi was enlarged I think that's when fuel supple issues would show up as the low pressure signal would weaken....we shall see.

The original stainless muff has been are lost somewhere.

Yep.

The original stainless muffler was modded. Stihl MS441RCM Free Muffler Mod - YouTube

About 3-4 weeks ago another AS member sent me a pm to inquire about the mod and was looking for some tips on how i did it. After some back and forth and a phone conversation, I offered to send him mine for free and he agreed to send his to randys shop (where my saw was going). I got a PM that he loved my muffler and that was the last i ever heard from him - i guess he decided to keep both mufflers . So after three weeks of no muffler we had to get a replacement.....and the black one was in stock.

Not sure about the air filter nuts though....i never took the cover off as i didnt even run a tank of fuel through the saw.

Anyway....moving on.....cant wait to see the results!


Greg

Thanks Greg for explaining what happened here. I didn't know the whole story, just that you got burned by one of our own.

 

[Mastermind]

Nice of you and your family to help out those victims.... I imagine it just comes naturally for you and you've instilled those values in your family.

oh, also interested in watching this saw progress

We should have been gone already if you ask me.

You of the guys that has a trailer is running late. He is meeting me here so.........

 

[blsnelling]

The 441C will have no trouble supplying the fuel required by the port work. The one I did is still running strong.

 

[FATGUY]

subscribed.

 

[naturelover]

Subscribed!

 

[Stihlofadeal64]

Subbed in with opcorn:!
opcorn::

 

[fastLeo151]

Sweeeeeeet!!!

Im excited to see the results!

Andrew
(Btw Randy Get anthing in the mail yet?)

 

[Mastermind]

The 441C will have no trouble supplying the fuel required by the port work. The one I did is still running strong.

Thanks for the info Brad. That helps set my mind at ease.

How to the 346 work out?

Im excited to see the results!

Andrew
(Btw Randy Get anthing in the mail yet?)

I'm not sure what all I got. I was gone until just a few minutes ago. My mailman and UPS guy both left several boxes in my van. I've not gone thru them yet.

I did get to run the 441 a bit today. I cut thru a nail and ruined a damn chain..........

 

[porsche965]

Mastermind meets the 441C

Absolutly subscribed!

 

[gcsupraman]

Randy,

Not sure if you've seen this before but Sam posted info in another 441 M-Tronic thread on recalibrating a M-Tronic saw. Good info.

(To recalibrate a 441 M-Tronic) The directions are as follows:

1. Remove the bar/chain and replace the cover (not sure why you have to have the cover back on).
2. Push the control lever all the way down to start.
3. Start the saw and don't touch the lever or trigger for over 1 minute. So start the saw in the start/choke position and let it idle (usually sounds pretty rough) for over 1 minute.
4. Then lift the control lever to the OFF position (again don't touch the trigger at any point).
5. Put the bar/chain back on and cut wood.

If the saw was out of tune or whatever it needs to be to run correctly, this is suppose to help it gauge itself. If the saw was closer to being in tune, then you won't notice anything.

I and a few others have noticed better idling (smoother) and it was smoother running at the higher rpms while in the cut, after I performed this procedure.

Sam

 

[deye223]

I did get to run the 441 a bit today. I cut thru a nail and ruined a damn chain..........

them trees have a lot of nails in em over there if i was you i'd grab me trusty 30-30 and go hunt'in bums with a hammer in there hand LOL

 

[Bowtie]

them trees have a lot of nails in em over there if i was you i'd grab me trusty 30-30 and go hunt'in bums with a hammer in there hand LOL

Railroad spikes suck even worse! Ask me how I know...:mad2:

 

[deye223]

Railroad spikes suck even worse! Ask me how I know...:mad2:

looks like you put up with nails and i put up with grit

[video=youtube;FAotjPER9N8]http://www.youtube.com/watch?v=FAotjPER9N8&context=C4c8c017ADvjVQa1PpcFNoPlybCSLFd7A30hqs5RKsgZB8pZ1lGik=[/video]

sory for the derail randy

 

[walexa07]

subscribed!

 

[Bowtie]

looks like you put up with nails and i put up with grit

[video=youtube;FAotjPER9N8]http://www.youtube.com/watch?v=FAotjPER9N8&context=C4c8c017ADvjVQa1PpcFNoPlybCSLFd7A30hqs5RKsgZB8pZ1lGik=[/video]

sory for the derail randy

Lot of sand blown into the lower trunks of trees around here. Living in the middle of the great plains we see wind all the time, and it is a sandy/silt area where I cut wood along the Solomon River. That crap embeds itself into the bark and grows into the tree.

 

[Mastermind]

OK I finally got out of the shop for the night. We had a hell of a day cutting up some big yard trees, hitting nails and wire every little bit. We did manage to clear out so they could use a skidsteer to start cleaning up the mess.....and a mess it was. I've never seen anything like that before.

Here's the low down for the numbers crunchers.

Stock compression: 145

Without a base gasket.......

Squish: .019 BTW the base gasket is .020 thick.

Ex: 102°

The transfers open progressively like the 261....

130° - 136.5°

In: 75°

I cut .045 from the squish band to raise compression and increase both strato and intake duration.

After machine work the squish was set at .025 and the intake was at 78° atdc.

Now for some pics of the disassembly.

 

[Mastermind]

Looks a lot like a 261.......

Not the best casting I've seen. We'll slick all that up though.

 

[Mastermind]

I brought a piece of oak back that's 30" in diameter........it came for a spot about 8' off the ground in one of the trees we cut up today. With a 28" B&C on the 441 I laid into it............hit a freaking nail!!!!!!!!! I check the other end of the piece out..........fixed the chain........hit another damn nail!!!!!!!!!!!!!!!!!

I ended up with a 20" B&C and a much smaller piece of some very hard white oak, but I finally got a video of the saw in wood. What a day.