Question about Garden
Won't start, intermittent weak spark
Posted by Anonymous on
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Posted on Jan 02, 2017
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
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
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
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
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
Posted on Jun 19, 2011
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