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Author Topic: Stihl MS261 no spark  (Read 252 times)

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Offline buckwheat1

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Stihl MS261 no spark
« on: November 06, 2017, 07:25:57 am »
Hello to everyone on the forum and thanks for letting me join. I have a MS261 in the shop with no spark. I've changed the coil out with a Stihl OEM coil The flywheel has 2 magnets(on opposite sides)with on side being a little stronger than the other side. BTW, it's not an Mtronic. It came in with the complaint that it started to sputter then quit running. Customer wasn't able to restart. I pulled on it a few times and no spark. Changed the plug-still no spark. I found the flywheel to have a sheared key which would certainly lead to the original complaint but can't figure why I can't get it to fire. The saw should fire with the flywheel spinning even if the timing's off. New coil set with a plain business card at first. I then tried it closer and farther away. Has anyone ever had a flywheel cause a no spark problem? Looking forward to hearing some ideas. I appreciate any suggestions. Thanks

Offline buckwheat1

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Re: Stihl MS261 no spark
« Reply #1 on: November 06, 2017, 10:18:02 am »
Sorry I forgot to add that I also disconnected the switch wires from the coil to eliminate that. Thanks, Buckwheat1

Offline Hilltop366

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Re: Stihl MS261 no spark
« Reply #2 on: November 06, 2017, 12:37:34 pm »
Did you reuse the plug cap and/or plug wire?

Offline buckwheat1

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Re: Stihl MS261 no spark
« Reply #3 on: November 06, 2017, 02:17:20 pm »
There is a new wire and cap molded into the coil. Thanks for the reply.

Offline Hilltop366

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Re: Stihl MS261 no spark
« Reply #4 on: November 06, 2017, 02:45:01 pm »
Did you try a known good plug, sometimes a new one is no good.

Offline buckwheat1

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Re: Stihl MS261 no spark
« Reply #5 on: November 06, 2017, 02:53:38 pm »
Tried new resistor and non resistor plugs plus one from a running saw. This saw's really a corker. Thanks for the replies.

Offline teakwood

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Re: Stihl MS261 no spark
« Reply #6 on: November 06, 2017, 07:20:42 pm »
Wait till joe_indi chimes in or write him a PM, he is "the man" for these problems

Offline Texas-Jim

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Re: Stihl MS261 no spark
« Reply #7 on: November 06, 2017, 07:26:17 pm »
You are correct, it will fire regardless on the flywheel timing. There are about 9 models of that saw, do you know which model it is?
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Offline buckwheat1

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Re: Stihl MS261 no spark
« Reply #8 on: November 06, 2017, 07:59:08 pm »
The recoil cover just says MS261- no C or CM. It has the standard jet adjustments on the carb with no other wiring other than the wires to the switch.

Offline buckwheat1

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Re: Stihl MS261 no spark
« Reply #9 on: November 07, 2017, 10:13:21 am »
Pulled the flywheel and found the N & S poles are correct on the magnets that fire the plug. Opposite these magnets are another set that seem to have little or no magnetism-they won't grip a small and light piece of wire. What are these extra magnets there for?

Offline sawguy21

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Re: Stihl MS261 no spark
« Reply #10 on: November 07, 2017, 11:33:54 am »
Those are counter weights to offset the magnets and allow the flywheel to be balanced.
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