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modded 241 tuning question.

skip sail

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howdy folks.
I have two masterminded stihl 241's that i use as work saws. love them,and have never had any problems.
First day of the firewood season for me,after a few months off and i had an issue with one of them(the other ran perfect)
The idle speed on the chain was running too high,causing chain spin off throttle. Not lumpy idle,just quite slow to drop rotations,unlike the other saw which stops spinning as soon as you back off the throttle

anyone know what might be causing this on an mtronic saw,before i try resetting to factory reset?
 

CR888

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If it was a standard carb saw I'd suggest adjusting the L screw. But its not its MT so you need to let the saw do it by re-callibrating. Given your story that states this is the first time you've used the saw since last season this makes sense as it was previously adjusted for different conditions. If a calibration doesn't sort it out I'd be inclined to clean the carb out as you would a normal saw. Did you run the gas dry before putting saws into storage?
 

skip sail

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yes,usually do that. i might be that its warmer weather than the last time i used that particular saw
 

shadco

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So?

Mtronic, run dry?

If so from what I understand you may just wanna go ahead and do a reset, I’ve read (on the inter webs) that if you run em dry they run wonky for a while, it seems they adjust the mixture try to not run lean and take a while to readjust.

.
 

Nutball

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Kinda stupid considering how often we run them out of gas. Auto tune on a tractor might be good, but not on something you run out all the time. I think their tuning logic should be based on how a person would respond. Let it warm up a bit before tuning it, do tune it constantly, if it does something weird like running out of gas or flooding before startup doesn't warrant immediate retuning.

Someone could probably make lots of money with aftermarket needle carbs for autotune saws. Anybody? China??
 

shadco

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Yeah but it doesn’t know you are trying to run it out of gas, it seems they prefer trying to quickly compensate for too lean and it is possible that doing so may save someone’s saw.

But I could be quite wrong.

.
 

bennne

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Mtronic has a memory and uses the same setting as when you last used it so if it had been some to just do a recalibration. This system is not as complicated as people think
 
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