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Stihl ms 311

Won't start, intermittent weak spark

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: NO START

1. has it been sitting?
2.if yes dump out the old gas and what is premixed since it is possibly old, 2 months max.
3. new prem gas and oil mix.
4.press the comp release when starting , was this pressed when you checked compression?
5.if will not sart try a quick blast of WD-40 in carb or a little gas. WD is flammable and will let you know if fuel related. if it fires for a couple seconds then sparks ok and still has gas problem. try one more time and maybe stuck fuel pump flaps in carb will become unstuck. if it runs on WD or small amount of gas in carb but not otherwise, sparks OK. time to rebuild carb check filter and Gas Line.
As always when playing with gas or other Flammables have a Fire Extinguisher ready for the "Expected". Always expect a fire that way you are calm, VERY important if you have spectators.
Safety Guy Bill

Posted on Jan 17, 2009

  • 583 Answers

SOURCE: Stihl ms 250 chain saw won't start, doesn't seem to catch spark.

dry the plug asmall squirt of aerostart in the top of carbywith air cleaner off full throttle pull the rope and she should fire up make sure the on/off switch is in the correct position. no don`t laugh ican remember nearly completely stripping amotor years ago before ichecked it put it all back together and it started first go try the aerostart and switch

Posted on Aug 04, 2009

  • 4088 Answers

SOURCE: weak spark hard start stihl 021

Check the pole gap on the ignition module to the flywheel magnets. Use a thin business card for a gauge. If it has the correct gap and you have tried a new spark plug, then the module itself is likely failing. Hope this helps!

Posted on Apr 22, 2010

  • 2239 Answers

SOURCE: hi i have a 019

Not a great Stihl fan, however they usually have a single stop start, choke and half throttle lever, depress the throttle trigger and at the same time pull the lever fully uplet go of the throttle trigger which should now be lock up, this will engage the part throttle and choke, crank the machine until it fires once, then move the lever down one notch and crank again until it fires up.

Posted on May 30, 2011

  • 252 Answers

SOURCE: The Stihl 038 super won't

hi there mwb15
have you made sure the ignition coil is producing enough voltage to fire under compression load ?

you may get a spark at the plug unloaded but under load it may be breaking down / weak making you think its got a fuel problem ?

does your system use a cdi coil system or point/condenser system ?
spark usually falls into weak spark, no spark catergory

if compression , fuel ( you replaced carb) and exhaust are ok , and you have air and vaccuum tight c/cases only things left are timming and spark

remember F A C T S

F = Fuel A = Air & ( air tight c/cases ) C = Compression T = Timming S = Spark

compression should be about 130- 140 approx if in good running order

take a look and let me know

cheers pauly46

Posted on Jun 19, 2011

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If you have a healthy spark (a blue snapping spark), it would not be a problem in the ignition system or the module. An orange, weak, or intermittent spark could point to trouble in the ignition.
I would check the timing on it, maybe it is a timing chain problem. It should have fired and ran a bit with the starter fluid. The fact that it didn't, even with a good spark, well, probably needs a little shop time investigating. Jumped timing from a worn chain? Low compression in one or more cylinders? A couple of things you need to consider.
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The Stihl 038 super won't start. It is getting too much gas on the spark plug when I try to crank it. Just replaced the carb hoping it was that but still it won't start. The saw was working fine a...


hi there mwb15
have you made sure the ignition coil is producing enough voltage to fire under compression load ?

you may get a spark at the plug unloaded but under load it may be breaking down / weak making you think its got a fuel problem ?

does your system use a cdi coil system or point/condenser system ?
spark usually falls into weak spark, no spark catergory

if compression , fuel ( you replaced carb) and exhaust are ok , and you have air and vaccuum tight c/cases only things left are timming and spark

remember F A C T S

F = Fuel A = Air & ( air tight c/cases ) C = Compression T = Timming S = Spark

compression should be about 130- 140 approx if in good running order

take a look and let me know

cheers pauly46

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