The ignition works off speed of rotation, so you need to crank the engine well withe the spark plug grounded, if there is still no spark, then the new coil is either incorrect for the model, or is faulty, also make sure the earth cut out wire on the unit is dissconected, to rule out a faulty switch or wire.
SOURCE: chainsaw running problem
The saw is not getting enough fuel. It should take about 7 pulls to hit(on choke) and then another 2 too start(on run).Check the fuel line and filter first,a fuel line leak is the most likely culprit, very common. Change the air filter, it's cheap and will eliminate any air related problems that may be contributing factors, and it probably needs to be done anyway. If this does'n't fix'ya we will continue on.
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I'm assuming the carb is not adjustable, if it is we can solve this in about 30 seconds-
SOURCE: where is the idler screw on a stihl ms 170
This is a link to your OM.
http://www.stihlusa.com/stihl_ownersmanuals/MS170_180_Manual.pdf
See page 43, that is the throttle adjustment.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou
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