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Mtronic flywheel lost magnitisum

keebo57

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Hi this is my first post here
I was reading a very interesting post about how mtronic actually worked, one member stated that his flywheel had lost magnesium the lads posting in the thread where very knowledgable so I joined this forum but lost the thread about the mtronic system & can find it again I have a 362 mtronic with one set of magnets with no/little magnetism I can gat a spark out of it the generator type flywheel.. the key has sheered on the flywheel but I can recut a keyway in the correct position
Any help would be greatly appreciated
 

Moparmyway

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You can run a saw without a keyway.

The keyway is only used for alignment purposes and doesn’t keep the flywheel positioned on the shaft. The squeeze of the taper is what actually keeps the flywheel from turning on the shaft.

I’m running a ported 3120 mostly on a mill, and because of the upgraded coil, I had to re-position the flywheel without any keyway.
 

av8or3

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What they said ^^^. I too am running one w/o the woodruff key.
Just take the time to find the sweet spot and install. Rap the flywheel down on the shaft with a socket and hammer to lock it down before you install the retaining nut to keep it from moving while you tighten the nut.
 

keebo57

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What they said ^^^. I too am running one w/o the woodruff key.
Just take the time to find the sweet spot and install. Rap the flywheel down on the shaft with a socket and hammer to lock it down before you install the retaining nut to keep it from moving while you tighten the nut.
Thanks but the keyway isn’t the problem I can broach another keyway. I have a 362 mtronic with one set of flywheel magnets with no/little magnetism I can’t get a spark out of it.. it’s the generator type flywheel
I found the thread

stihl's mtronic​

https://opeforum.com/threads/stihls-mtronic.6713/page-2
 

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av8or3

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How are you testing for spark? If you’re spinning it with a drill motor you must spin it very fast. Very fast!
 

Wonkydonkey

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That’s a heated handle flywheel,. But I guess you know that ?
 

5155

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Aviator said, "Just take the time to find the sweet spot and install"

Is this dome by trying different positions, apart, move, back together, repeat? Or another way?
 

av8or3

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Aviator said, "Just take the time to find the sweet spot and install"

Is this dome by trying different positions, apart, move, back together, repeat? Or another way?
That is pretty much how it’s done. Set your piston to top dead center, line the magnets up with the coil and start there, or just a little in advance of there. Give her a pull and see what happens.
 

5155

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Thanks Av.
Have a saw that acts like a small block with a dist. tooth off to the advance side.
Might be cool around the buddies but useless in the real world.
Next time I'll check it how you said.
If not advanced too far, I'll try thicker BG.
I've tried enough stuff it is getting under my skin lol.
 

av8or3

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It’s also been noted before, but unless that saw of yours has heated handles, it has the WRONG flywheel on it. Might pay to do some investigating into what the correct flywheel might be.
 

Wonkydonkey

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It’s also been noted before, but unless that saw of yours has heated handles, it has the WRONG flywheel on it. Might pay to do some investigating into what the correct flywheel might be.
Yes, iwas thinking the same,,,

It would be good if the op (@keebo57) was to give a bit more info on the saw, ie it was working ? Or brought as a spares/repairs etc

I will pm him the ipl and the tech bulletin, the latter will help will what works with what ie mtronic version etc.

Hopefully I’ve attached them 😉🤔 correctly
 

keebo57

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How are you testing for spark? If you’re spinning it with a drill motor you must spin it very fast. Very fast!
Hi and thanks I have it set up in the lathe & can go up to 200 - 2000 rpm's.. I’ve tested coils in this way can get a spark at low revs usually if coil is good
 

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keebo57

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Yes, iwas thinking the same,,,

It would be good if the op (@keebo57) was to give a bit more info on the saw, ie it was working ? Or brought as a spares/repairs etc

I will pm him the ipl and the tech bulletin, the latter will help will what works with what ie mtronic version etc.

Hopefully I’ve attached them 😉🤔 correctly
Hi and sorry for not replying I bought the saw as spare repair
 
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keebo57

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Yes, iwas thinking the same,,,

It would be good if the op (@keebo57) was to give a bit more info on the saw, ie it was working ? Or brought as a spares/repairs etc

I will pm him the ipl and the tech bulletin, the latter will help will what works with what ie mtronic version etc.

Hopefully I’ve attached them 😉🤔 correctly
Yes I've got the files thanks & yes the saw is the heated handle type
 

keebo57

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I’ve got the 362 saw running with flywheel of my 261 c-m..
so the problem must be with the heated handle 362 flywheel only one set of magnets are magnetised on that flywheel
So now I need a 362 c-m heated handle flywheel
The part number on the 362 H/H flywheel is the same as a standard 362 flywheel I have both flywheels
Our if I can’t get a 261 c-m heated handle flywheel I will remove the generator ring and mount the ring on the back of a 261 c-m our a 362 c-m
And defo won’t be ripping the heated system of the 362 and throwing the towel in cos I don’t just give up that easily.
 
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