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Stihl MS261 backfiring, running backwards and generally misbehaving


AWG81
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Yeah.....this one's a classic. Think about what you are actually saying to the person you really need help from before you use this one, but I bet a load of you do!

 

'I've been everywhere.....you're my last chance'

 

Think about how that sounds for a moment. I hear that a lot and people really don't realise what they are saying.

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Thanks both. Yeah, it's running with the aftermarket coil. I have another one I can try. The decomp is genuine Stihl which I put on so that should be fine.

 

It certainly does seem like it's flooding the chamber.

 

I appreciate it's difficult to diagnose without seeing the machine. The suggestions here are super helpful. I'm sure I can get this thing sorted eventually and I will have learnt something along the way.

 

Actually maybe the lesson is "don't buy cheap saws off eBay in the first place"...

 

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Try the original OEM coil, it may well work and sounds like the start up ignition timing of the aftermarket coil is causing the backfire and the decomp valve to pop out.

Flooding generally means the saw may pop but generally stops it running in my experience. 

Try the easy most likely stuff first, if the saw does idle and rev out once started, it is probably unlikely to be carb related.

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Just wanted to update on this - I swapped out the coil for another one and it seems to be working pretty good. I fixed the switch issue too. Used it all day today for work, and mostly all good after a bit of carb adjustment. Does seem to very occasionally backfire, and doesn't like to start with the decomp valve in so it's not perfect, but usable which is a big improvement on where I was. Thanks for the advice here, much appreciated.

 

Cheers!

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