STIHL The Official Stihl Chainsaws Thread

[bigbadbob]

Ok, heres a question for the hive mind, early MS261CM, straight finned jug, saw was straight gassed, put new cylinder/piston in, started and ran great seating the rings, let it sit to idle and heat cycle after a few light cuts to initially seat the rings, died at idle, thought it ran out of fuel... nope, 1/4 tank still... topped off and attempted starting, saw flooded... found no spark with 3 different spark plugs (ngk that saw was running on, new ngk, and new bosch) and 2 different Stihl ZAT4 spark testers... nothing at all... ohmed out the wiring harness, all connections are solid, 0.1ohm continuity, no chafing anywhere... spark plug lead to ground showed 1.72k ohms, within spec of 1.5-12k ohms, tried a brand new fuel solenoid, no change...

whats the chances that the stupid expensive module is at fault???

Maybe @Mastermind has seen something like this before?

Have a 261 that wont start hot,,,,, ya done it all,, next is a trip to a friendly dealer to scan it.
Other than that a fab saw for its size.

 

[bogieboy]

Have a 261 that wont start hot,,,,, ya done it all,, next is a trip to a friendly dealer to scan it.
Other than that a fab saw for its size.

I am the friendly dealer guess i gotta pull out the MDG and see what it says....

 

[Mastermind]

I am the friendly dealer guess i gotta pull out the MDG and see what it says....

Looking forward to seeing your results.

 

[bogieboy]

Looking forward to seeing your results.

Guess the module failed... everything else checks out as far as my testing...

 

[Mastermind]

Guess the module failed... everything else checks out as far as my testing...
View attachment 431956

The red screen of death....

 

[bigbadbob]

What he said
was quoted bout $150 cad here for the coil n brain part.

 

[FergusonTO35]

I've had good luck with aftermarket automotive rebuild PCM's, I wonder if this module could be done? It only controls two things doesn't it?

 

[bogieboy]

Well, found a used coil for cheap cheap on eBay. See if that fixes my problem, otherwise I'm going to have to go OEM, or switch it over to the 291 carb coil and flywheel that I have sitting in my boxel parts, would rather have mtronic though

 

[bogieboy]

What he said
was quoted bout $150 cad here for the coil n brain part.

OEM Stihl MS362 C-m Chainsaw Ignition Coil | eBay

Find many great new & used options and get the best deals for OEM Stihl MS362 C-m Chainsaw Ignition Coil at the best online prices at eBay! Free shipping for many products!

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This is what i got, the seller has another one with the harness and air guide/switch on it for $35, dont know if they would ship to maple leaf land though, might be an option.... then again no garuntee that it will work either, thats worth a $25 gamble to me... the coil retails for $145 here in NY... granted i get parts cheaper, but so far i have $10 invested in this saw aside from the coil thats on its way... so if i dont have to lay out oodles of money i wont....LOL

 

[Woodwackr]

Guess the module failed... everything else checks out as far as my testing...
View attachment 431956

3:1, bad connection. I say, bad hookup
Jiggle the wires

 

[bogieboy]

3:1, bad connection. I say, bad hookup
Jiggle the wires

While i would agree, i ohm'd out the harness in as many bizarre angles as i could, and flexing any part that looked even remotely suspisious... i am not new to mtronic... had coil and harness out and back in 2x today, with no spark, and no connection to the mdg, connector for the mdg is on the carb harness, not the main harness, and still continuity tested fine...

 

[Woodwackr]

While i would agree, i ohm'd out the harness in as many bizarre angles as i could, and flexing any part that looked even remotely suspisious... i am not new to mtronic... had coil and harness out and back in 2x today, with no spark, and no connection to the mdg, connector for the mdg is on the carb harness, not the main harness, and still continuity tested fine...

Mtronic is great, when it works . I kinda prefer it in the newer saws

 

[Mastermind]

Mtronic is great, when it works . I kinda prefer it in the newer saws

Same. Very much prefer.

 

[bogieboy]

OEM Stihl MS362 C-m Chainsaw Ignition Coil | eBay

Find many great new & used options and get the best deals for OEM Stihl MS362 C-m Chainsaw Ignition Coil at the best online prices at eBay! Free shipping for many products!

www.ebay.com

This is what i got, the seller has another one with the harness and air guide/switch on it for $35, dont know if they would ship to maple leaf land though, might be an option.... then again no garuntee that it will work either, thats worth a $25 gamble to me... the coil retails for $145 here in NY... granted i get parts cheaper, but so far i have $10 invested in this saw aside from the coil thats on its way... so if i dont have to lay out oodles of money i wont....LOL

Also, full disclosure, going to be doing an experiment on this one, putting a 362 m tronic coil in a 261... cant see any reason it wouldnt work, coil mount is the same as far as i can see comparing my 362 and 261 coils, only reason i havent swapped coils that way because the 362 is not mtronic...

 

[Mastermind]

Also, full disclosure, going to be doing an experiment on this one, putting a 362 m tronic coil in a 261... cant see any reason it wouldnt work, coil mount is the same as far as i can see comparing my 362 and 261 coils, only reason i havent swapped coils that way because the 362 is not mtronic...

I was wondering....

 

[bogieboy]

I was wondering....

I see no reason why it wouldnt work, both mtronic carbs have the same harness, only difference is the secondary butterfly and smaller primary venturi on the 362, one would think it shouldnt have too different of a timing and fuelling map...

 

[bigbadbob]

Also, full disclosure, going to be doing an experiment on this one, putting a 362 m tronic coil in a 261... cant see any reason it wouldnt work, coil mount is the same as far as i can see comparing my 362 and 261 coils, only reason i havent swapped coils that way because the 362 is not mtronic...

Thats now sold.
I will wait for you to post on the coil,,,,

 

[lehman live edge slab]

I’m going to guess the 362 coil won’t run quite right on the 261 but we’ll see I guess.
I’m thinking the timing and fuel map will be off enough where it won’t run well. No point in Stihl making two parts if one works for both. Also it probably will vary on what version mtronic it has for all of it to work together well. 261 mtronic version 1 and 2 have a different jet in carb vs version 3.

 

[bogieboy]

Thats now sold.
I will wait for you to post on the coil,,,,

The link i posted is the one i purchased, the seller has more of them, i will let you know how it works out for me as soon as i get it put in

 

[lehman live edge slab]

I just need a crank for a 261, got one here that’s nice shape that I bought as a parts saw but lower rod bearing is loose