Part Five: Ignition Timing

[wcorey]

There is actually a thread on AS (I've still got it on my watch list, I can PM anyone if they are interested), where some guy hacks up a busted 056 ign unit and changes the blown capacitor. A labour of love, yes, but I guess that's the case with a lot of these projects.

No need for pm's, we can post links here. Years spent on AS has us conditioned to be paranoid, lol.

http://www.arboristsite.com/communi...osch-electronic-ignition.256095/#post-4784239

 

[tree monkey]

doing some testing with a timing light on a ms261c-m

 

[tree monkey]

my findings were interesting. the timing seems to jump around at idle, I took an average of 18 deg and 50 deg above 5000 rpm. this seem way to much to me.
I advanced the timing with the key by 7 deg using a deg wheel, and redid the timing light test. idle 32 deg, over 5000 rpm 64 deg. well ok. so the ign sparks twice per revolution. so stock timing is 9 and 25. my advanced key is 16 and 32.

 

[Mastermind]

Good stuff Scott.

 

[tree monkey]

what i'm finding is that the mtronic on each saw works different.

 

[Time's Standing Stihl]

what i'm finding is that the mtronic on each saw works different.

You saying each saw is different or each series is different?

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[paragonbuilder]

what i'm finding is that the mtronic on each saw works different.

Have you found a light that works over 10k yet?


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[Hedgerow]

my findings were interesting. the timing seems to jump around at idle, I took an average of 18 deg and 50 deg above 5000 rpm. this seem way to much to me.
I advanced the timing with the key by 7 deg using a deg wheel, and redid the timing light test. idle 32 deg, over 5000 rpm 64 deg. well ok. so the ign sparks twice per revolution. so stock timing is 9 and 25. my advanced key is 16 and 32.

Just shoot that sonofabich and grab a 346 Scott..
Or grab a Stihl engineer and punch him in the face.
Either or...
Works for me.

 

[tree monkey]

You saying each saw is different or each series is different?

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what i'm thinking is what would happen if I put a 261 coil on a 661? or a 661 oil on a 261?

I might find out

 

[Adirondackstihl]

Just shoot that sonofabich and grab a 346 Scott..
Or grab a Stihl engineer and punch him in the face.
Either or...
Works for me.

WOW!!
Tell us how you really feel Matt.
Don't hold back!

 

[tree monkey]

Have you found a light that works over 10k yet?


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not yet, if someone knows where to get one please et me know.

 

[tree monkey]

Just shoot that sonofabich and grab a 346 Scott..
Or grab a Stihl engineer and punch him in the face.
Either or...
Works for me.

this 261 runs right with the 2150/2153 you ran in iowa. lot less work

 

[GCJenks204]

what i'm thinking is what would happen if I put a 261 coil on a 661? or a 661 oil on a 261?

I might find out

I guess I can wait some more. For the sake of the site, science and all...

 

[tree monkey]

lol, ya never know, I might find a bit more speed in your saw as well, with the testing I did today I think there is

 

[GCJenks204]

lol, ya never know, I might find a bit more speed in your saw as well, with the testing I did today I think there is

Really doesn't matter how fast itnis if I never get to put it in wood...

Is there any chance that it being an arctic has anything to do with it? Different coil or anything?

 

[tree monkey]

lol, i'll get it in the mail next week, promise

 

[Hedgerow]

this 261 runs right with the 2150/2153 you ran in iowa. lot less work

If Stihl wants to have a shot in a 3 cube race, somebody gotta figure out how to make a 261 really run.

 

[Stihlbro]

If Stihl wants to have a shot in a 3 cube race, somebody gotta figure out how to make a 261 really run.

You need to watch West Virginia , Louisiana, Arkansas and Alabama racing. You might restate that.

 

[GCJenks204]

lol, i'll get it in the mail next week, promise

I'm just bustin on ya. If you want to experiment and do more testing I am fine with that.

Just make sure you keep the videos coming...

 

[Hedgerow]

You need to watch West Virginia , Louisiana, Arkansas and Alabama racing. You might restate that.

gas??
Or alky?