MS261 Not Sparking

[Backpain]

Got my MS261 on the bench yet again. Replace the piston after being seized and ran fine for a few minutes then stopped. Checked a few things and found its not sparking.

 

I'm assuming the coil has gone tits up but is there anything else I need to look for.

 

Help is much appreciated.

[Stubby]

Put a new plug in first . If no joy check the gap between fly wheel magnets and spark unit .

[spudulike]

Put a new plug in first . If no joy check the gap between fly wheel magnets and spark unit .

 

Very good Andy:lol: top marks

[Backpain]

What does the gap need to be, coils never been touched nor has fly wheel. Changed plug no difference there. Seems strange one minute it was running fine then just stops. I think coils gone tits up, but Ive never had that happen on any engine before not like this. But then again they've changed so much on these new saw's god knows what could go wrong.

[spudulike]

What does the gap need to be, coils never been touched nor has fly wheel. Changed plug no difference there. Seems strange one minute it was running fine then just stops. I think coils gone tits up, but Ive never had that happen on any engine before not like this. But then again they've changed so much on these new saw's god knows what could go wrong.

 

Get a typical business card, rotate the magnet away from the coil and place the business card between the flywheel and the coil then rotate the magnet so it sits in front of the coil. The business card should be a tight fit between the two - if it isn't, loosen the retaining bolts allowing the coil to be drawn toward the flywheel magnets and then do it up.

 

Other than this, it is worth disconnencting the ignition kill wire from the coil and trying the spark again as it may be earthing out somewhere. It is also worth trying a multimeter to measure the resistance between the cap and coil kill connection to make sure there isn't a break in the HT wire or plug cap.

[Neil-R]

Checked media cat coil gap should be 0.20 (+0.10/-0.05)mm

Spark plug gap 0.5mm

As spud said check the lt lead for damage

 

 

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