Mastermind Revisits The MS261CM Type II

[retro]

you can advance the timing, cut key, a lot and the coil will the timing where it wants it. there are gains to be had by cutting the key because it lets the coil advance more at high rpm. I put a timing light on it with stock key and with cut key. timing at idle did not change.

Thats some valuable info, thanks!

 

[tree monkey]

Julian played with a 261 coil on his 661 but never ran it. only could put in 1 screw

 

[MustangMike]

Very interesting Scott. About how much does it advance when stock, and about how much more to reach "optimum"?

I took about .020 off the 362 C flywheel, and it helped, but no idea if that was optimal or not.

Also, if I'm correctly following how MTron works, than it won't go "too far" even if you give it too much rope?

 

[tree monkey]

when I checked timing on the 261 m-tronic, the timing changed at idle with cutting the key, the timing also jumped when it advances. the 661 timing changes smooth as the rpm's increase

 

[retro]

The 661 coil might work better on the 261 than it does on the 661. You've done a lot of testing on those buggers sounds like. Have you been changing up the strato ports at all or leaving them alone? I'm wondering if those could be configured to make more power somehow?

 

[tree monkey]

Very interesting Scott. About how much does it advance when stock, and about how much more to reach "optimum"?

I took about .020 off the 362 C flywheel, and it helped, but no idea if that was optimal or not.

Also, if I'm correctly following how MTron works, than it won't go "too far" even if you give it too much rope?

you can over cut the key on a 661 without it hurting performance much. but you can go to far on a 261. the 261 is not as smart as the 661

 

[MustangMike]

How far is too far??? I just went .020, that about good?

 

[TreeLife]

All this thread did was make me want a 261, and with the 2260 out of commission that might even be a thing.

 

[MustangMike]

I'll let you know how I like it. Hopefully, sometime in the future you will get to run it also.

 

[tree monkey]

How far is too far??? I just went .020, that about good?

haven't done many 362's, but that would be a good place to start

 

[tree monkey]

241 strato intact

 

[VinceGU05]

Basically the fresh air is creating a "Dam" between the fuel charge and the exhaust gasses (pressure differential) and pushes the spent gasses out of the exhaust port so less of the fuel charge is lost out of the muffler before having a chance to ignite and do work.

and hence better fuel economy as fuel is used only for the burn and not the pushing, only fresh air is.

 

[CR888]

Is the coil on the MTronic 261 limited? I have OE standard carb saws & I can tune my porded one out above 15k so I guess the OE is unlimited. Its good when TM climbs down the tree & starts talking saw stuffs.

 

[paragonbuilder]

Is the coil on the MTronic 261 limited? I have OE standard carb saws & I can tune my porded one out above 15k so I guess the OE is unlimited. Its good when TM climbs down the tree & starts talking saw stuffs.

Was the 261 mtronic coil updated on the ne saw?

 

[breese]

Does anyone have a bad (known or unknown) mtronic coil laying around?
The newer the better.
I do not want to waste good $$ on a new one that will never see the inside of a saw.

 

[Mastermind]

Does anyone have a bad (known or unknown) mtronic coil laying around?
The newer the better.
I do not want to waste good $$ on a new one that will never see the inside of a saw.

I bet we can find one.

 

[big t double]

Does anyone have a bad (known or unknown) mtronic coil laying around?
The newer the better.
I do not want to waste good $$ on a new one that will never see the inside of a saw.

Sure I have one from an earlier ms261. Where in Chicagoland are you? drive to my shop and pick up a couple if you want...im an hour west of Chicago.

 

[Mastermind]

Sure I have one from an earlier ms261. Where in Chicagoland are you? drive to my shop and pick up a couple if you want...im an hour west of Chicago.

My hero.

 

[big t double]

My hero.

Oh you stop it. You're making me blush. Or I'm hung over...one or the other.

 

[Mastermind]

Oh you stop it. You're making me blush. Or I'm hung over...one or the other.

Both?

Maybe?